Blunt force trauma: how the injuries are classified, documented and used in court

Blunt force trauma is injury from impact with something that does not cut: a fist, a floor, a dashboard, a bat, a wheel, the ground at the bottom of a fall. The energy crushes, stretches and tears tissue instead of slicing it. Sharp force trauma is the other family, caused by an edge or a point.

The definition is simple; the labels are not. In a 2023 primer for the American Society for Clinical Pathology, a deputy medical examiner for Cuyahoga County, Ohio, points out that medical records often call every open wound a "laceration," even though the word has a narrow forensic meaning, and that mislabeling can send law enforcement down the wrong path. A scalp wound called a laceration points toward a blunt object. The same wound called an incised wound points toward a blade. 1 word in a triage note can change the theory of a case.

Blunt injuries also cover every manner of death and every kind of claim. The primer notes that blunt force deaths can be accidental, suicidal or homicidal, including motor vehicle crashes, falls and beatings. The same record types, EMS, emergency department, imaging, photographs and sometimes an autopsy, appear in all of them. The questions change.

Each record was written by someone with a different job. The paramedic was treating and transporting, the emergency physician was ruling out bleeding, the forensic pathologist was documenting for a legal record. Expect different words, measurements and times for the same injury.

Blunt force trauma

Injury from impact with a blunt object or surface: a fall, a blow, a crash, crushing. Tissue is compressed, stretched or torn rather than cut.

Sharp force trauma

Injury from an edge or point. Stab wounds are deeper than they are long; incised wounds are longer than they are deep.

Abrasion

A scrape: the superficial layer of skin is removed by friction or pressure.

Contusion

A bruise: bleeding into the skin and the tissue under it from ruptured vessels, with the skin surface usually intact.

Laceration

In forensic use, a tear: skin crushed and split by blunt force, often with abraded edges and strands of tissue bridging the wound.

Fracture

A break in bone. Location, number and pattern can bear on mechanism.

Patterned injury

An injury that reproduces the shape or surface of the object that caused it, such as a tire tread.

Forensic texts group blunt injuries into 3 skin injuries, abrasions, contusions and lacerations, plus fractures of bone. Internal organs can be bruised or torn the same way. Each type has limits people stretch in litigation.

Abrasions

The Lablogatory primer defines an abrasion as a scrape in which the superficial layer of the skin is removed. Because the skin surface itself takes the contact, abrasions are the injury most likely to keep a record of the surface that struck it, and forensic descriptions often note their direction. The primer gives "brush burns" or road rash in an ejected crash passenger as an example.

Contusions

A contusion is bleeding into the skin and tissue under it. The primer describes it as hemorrhage in the skin and subcutaneous tissue. Clinicians often record bruises as "ecchymosis" with little more. Deep bruising may not show on the skin at all. Forensic autopsies record deep bruises found when tissue is cut, and the French autopsy study in chapter 9 used them as 1 of its discriminating variables.

Lacerations, and why "incised" is a different word

A laceration, in the forensic sense, is a tear. The primer describes skin that is crushed and torn, with tissue bridging from intact nerves and blood vessels across the wound, and edges that are often abraded. Sharp force injuries transect all tissue, so they show no bridging. That 1 feature, strands of tissue spanning the wound, is often the difference between "struck with an object" and "cut with a blade." It is also the feature clinicians almost never write down, because it does not change how they close the wound.

The primer adds that chop wounds from heavy edged objects combine features of both. A chart that says "laceration, 4 cm, 6 sutures" cannot tell an expert which family the wound belonged to.

Fractures

A fracture records force delivered to bone, and it shows up on imaging, which makes it the best-preserved blunt injury in the record. The CT report gives location, count, displacement and sometimes the pattern. Fractures also carry clinical weight long after the event. In a 10-year Level I trauma center review, patients 65 and older with rib fractures died at a rate of 22%, against 10% for younger patients with similar injury scores. Chapter 9 returns to that study.

Some blunt injuries reproduce the object. The Lablogatory primer notes that the object can impart a pattern on the skin or leave trace evidence, and gives a tire tread pattern as an example. The principle is the same for any striking surface with a distinct shape or texture.

A patterned injury is only as good as its documentation. The primer says patterned injuries are photographed at autopsy with the ABFO ruler, an L-shaped scale named for the American Board of Forensic Odontology, so the pattern can be measured and compared later. Emergency departments rarely use 1. The 2026 German study in chapter 7 found clinical photographs often lacked any reference scale, so the size of an injury could not be determined from them.

What makes a pattern usable

1. A scale in the frame. A ruler in the plane of the injury, ideally an L-shaped forensic scale, so distortion can be corrected and dimensions measured.
2. A perpendicular shot. The camera square to the skin. An angled photograph stretches the pattern in 1 direction.
3. An orientation shot. A wide view, then the close-up.
4. Timing. The date and time of the photograph, and who took it. Bruises change in appearance over time (chapter 4), so a single photograph is a snapshot.

A patterned injury can tie an injury to a product, a surface or a weapon. A missing scale, an angled shot or no orientation photograph is the first line of attack on any claimed match, and a fair one.

Few questions come up more in blunt force cases than "how old is this bruise?" It decides whether an injury fits an account, a shift or a single event. The research answer is short: color is not a reliable clock.

In a 2005 systematic review in Archives of Disease in Childhood, Maguire, Mann, Sibert and Kemp screened 167 studies and found only 3 that met their quality criteria. Their findings:

• Any color, including red, blue and purple, could appear in fresh, intermediate and old bruises.
• Studies disagreed about yellow: 1 put its earliest appearance after 24 hours, another after 48 hours, another within 48 hours.
• Clinicians estimated a bruise's age to within 24 hours of the injury with less than 40% accuracy.
• Sorting bruises into fresh, intermediate or old was 55 to 63% accurate, and agreement between observers, and by the same observer on different occasions, was poor.

"A bruise cannot accurately be aged from clinical assessment in vivo or on a photograph."

The authors went further: estimating age from color "has no scientific basis and should be avoided in child protection proceedings." The review studied children only. Whether its findings carry over to adults and older people is a question to put to your expert, not an assumption.

What the forensic literature allows

A 2007 review by Langlois in Forensic Science, Medicine, and Pathology surveyed the English language research on aging bruises. It found that a yellow color (not orange or brown) indicates a bruise is not recent, that visual assessment is limited by the physiology of the human eye, that instruments such as spectrophotometry may help, and that tissue examination under the microscope may be appropriate only after death. It also found that nobody knows how the many factors that affect bruising change an age estimate.

So the defensible statement is narrow. A yellow bruise is probably not fresh. Beyond that, a record or an expert who says "bruises of different ages" or "a 3 to 5 day old bruise" from color alone deserves a direct question: what is the basis, and what is the error rate? Under Federal Rule of Evidence 702, the proponent of expert testimony must show it is more likely than not that the testimony is "the product of reliable principles and methods," and many states have similar rules.

The records can bound timing with facts that are not color: the first documented observation, the last exam with no injury noted, and time-stamped serial photographs. A nursing home skin assessment that says "skin intact" on Tuesday and "bruise left forearm" on Thursday gives a window, whatever color the bruise was.

A blunt trauma patient generates records from at least 4 sources in the first hours, each with its own clock and custodian. A request for "the medical records" usually produces only part of the set.

The EMS run sheet and field triage

The run sheet is the only medical record made at the scene, which makes it the earliest description of mechanism, position and mental status. Paramedics decide where to take the patient under regional protocols. The national reference is the 2021 National Guideline for the Field Triage of Injured Patients, developed by an American College of Surgeons panel with support from the National Highway Traffic Safety Administration and published in 2022.

The guideline sorts criteria into 2 groups. High-risk (red) criteria cover injury patterns, mental status and vital signs. Moderate-risk (yellow) criteria cover mechanism of injury and EMS judgment. The guideline says patients meeting any red criterion should be preferentially transported to the highest level trauma center available within the regional system. Criteria that come up in blunt force files include:

• Mental status. "Unable to follow commands (motor GCS <6)" replaced the older total GCS of 13 or less.
• Injury patterns. Skull deformity or suspected skull fracture, chest wall instability, suspected pelvic fracture, and 2 or more suspected proximal long-bone fractures, among others.
• Vital signs. Room air pulse oximetry under 90%, respiratory distress or need for respiratory support, heart rate greater than systolic blood pressure for age 10 and up, and systolic pressure under 110 in older adults.
• Mechanism. A fall from height over 10 feet at all ages, replacing the older adult threshold of 20 feet; pedestrian or cyclist thrown, run over or struck with significant impact; and rider separated from a transport vehicle (motorcycle, ATV, horse) with significant impact, which replaced the older motorcycle crash over 20 mph criterion.

The triage section is a trained observer's early read of how bad the event looked. In a fall case, check whether the crew recorded a height at all.

Trauma activation and the primary survey

Trauma activation is the hospital's call-out of its trauma team before or at arrival. Tiers and criteria are set locally, so the only reliable reference is the hospital's own activation policy in effect on the date. Ask for it. The trauma flowsheet usually records the activation level, the time the page went out, who arrived and when, then a structured primary and secondary survey. Those time stamps are often the tightest clock in the chart.

GCS as documented

The Glasgow Coma Scale, described by Teasdale and Jennett in 1974, scores 3 responses: eye opening, verbal response and motor response. The official site says the total score runs from 3 to 15. Its FAQ tells clinicians not to use "1" for a component that cannot be tested, to record "NT" (not testable) instead, and not to report a total when a component is not testable, because a low total can imply the patient is more unwell than they are. An intubated patient's verbal score is the classic example. When a chart shows "GCS 3" on an intubated, sedated patient, ask what each component was.

FAST

The focused assessment with sonography for trauma is a bedside ultrasound for free fluid, usually blood. The AIUM practice guideline, published with ACEP, lists 4 views: right upper quadrant, left upper quadrant, pelvic and pericardial. An extended exam adds the chest for hemothorax and pneumothorax. On documentation, the guideline says images should be created and stored as part of the medical record "whenever feasible," and that "a full description of the findings is required." It also says a FAST may not show all abnormalities in the chest, abdomen or pelvis, and is less reliable in some settings, including some injured children and mesenteric injuries. A negative FAST is not a negative abdomen. If the chart says "FAST negative" with no stored images, that is a documentation gap worth logging.

CT

CT is where most blunt injuries get their definitive description. Request 3 things for every study: the report, the order, scan and result times, and the DICOM images. Preliminary and final reads can differ; ask for both.

Trauma scores look like findings. They are summaries with rules; read the rules before quoting the number.

AIS and ISS

The Abbreviated Injury Scale, maintained by the Association for the Advancement of Automotive Medicine, scores each injury by body region on a scale from 1 (minor) to 6 (maximal). A 2025 validation study in the Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine notes that AIS 2008 has 1,999 injury descriptors and AIS 2015 has 2,006, and that AIS coding is done by trained coders after a 2-day course, with recertification every 5 years. That is why AIS scores are often not in the bedside notes at all. They are assigned afterward, for audit and research. Ask whether the hospital keeps a trauma registry record for the patient.

The Injury Severity Score, introduced by Baker and colleagues in 1974, is built from AIS. Take the highest AIS score in each of the 3 most severely injured body regions, square each, and add them. The 2025 paper groups injuries into 6 regions for this purpose: head and neck, face, chest, abdomen and pelvis, extremities, and external. The same paper notes that major trauma is usually defined as an ISS of 16 or more, and that the ISS is useful for benchmarking in trauma audit and research, "but not for individual decision-making."

3 things follow from the arithmetic. First, only the worst injury in each region counts, so 3 rib fractures and 1 rib fracture can score the same if the region's highest AIS does not change. Second, the 4th, 5th and 6th regions are ignored completely, however many bruises they hold. Third, because the scores are squared, 1 change in a single region's AIS moves the ISS a lot. A coding dispute over whether a chest injury is AIS 3 or AIS 4 moves this patient from 22 to 29.

Using the scores in a case

• Do not use ISS for 1 person's prognosis. The source paper says it is for audit and research, not individual decisions.
• Do use ISS to compare against studies. It tells you whether published cohorts, like the rib fracture study in chapter 9, look like your patient.
• Check who assigned the AIS. A trained registry coder, the hospital's software, or an expert estimating after the fact are 3 different sources of the same number. Coders disagree: the 2025 paper notes poor agreement even among AIS-certified coders in Norway, and cites a Dutch registry where inter-rater agreement was 49%.
• GCS needs its components. Quote "E3 V4 M6," not "13," and note any NT. The 2021 triage guideline relies on the motor component alone for its mental status criterion.

An emergency physician and a forensic pathologist can describe the same wound differently and both be accurate for their purpose. The physician needs to know how to treat and close it. The forensic examiner needs to know what made it, from which direction, and when.

A 2026 study in Forensic Science International: Synergy measured the gap directly. Gyenes and colleagues took 141 clinical injury reports from criminal proceedings handled by the Institute of Forensic Medicine in Mainz, Germany. They compared 259 injuries as the clinicians described them with 585 injuries described by forensic experts working from the clinical photographs. The forensic opinion explicitly said the clinical photographs gave limited information in 18.6% of cases.

The pattern holds in the study's numbers on injury type too. Clinicians labeled 4.0% of injuries as lacerations and 4.9% as incised wounds; the forensic experts, working from the same photographs, labeled 0.4% and 1.5%. For intact skin such as bruises, clinicians recorded size more often (57.6% against 46.6%) and forensic experts recorded color more often (61.8% against 52.3%). The authors also found many clinical photographs had no reference scale, so injury size could not be determined, and they cite an earlier European study where forensic assessment was hindered in nearly 20% of cases.

None of this makes the clinical record wrong. It answers treatment questions and leaves forensic ones open, so a later forensic opinion on a repaired wound rests on the photographs and whatever the clinician chose to write.

For a death, the autopsy report is the forensic record, and its external examination often lists every injury with measurements, which the emergency record may not. How to read an autopsy report covers its structure section by section. For a surviving victim of violence, the forensic record may be a clinical forensic exam: see the companion guides on non-fatal strangulation records and SANE exam records.

Photographs and body maps are how a blunt injury survives healing. Inventory every image and diagram before any expert opinion is written.

Where the images are

• Hospital clinical photographs. Sometimes in the chart's media tab, sometimes on a department camera or a clinician's device under a separate system. Ask for them by name and in native format.
• Police and crime scene photographs. Law enforcement records, not medical records. They may be the only images of a wound before repair.
• Autopsy photographs and diagrams. Held by the medical examiner or coroner, with access rules set by state law.
• Family and phone photographs. Often the only serial record of how a bruise changed. Preserve the original files with metadata.

Note the front view is drawn as if facing the patient, so the patient's left is on the viewer's right, while the back view puts the patient's left on the viewer's left. Body map forms differ on this, and a mark on the "wrong" side is a common source of apparent contradictions between records. Check the form's own orientation labels before flagging a discrepancy.

Most blunt force disputes are about mechanism: fall or blow, driver or passenger, how long pinned. The records supply the facts an expert weighs.

Fall versus blow, and the hat brim line

The hat brim line rule is the old teaching that head injuries from a fall tend to sit at or below the brim of a hat, while injuries above it suggest blows. 2 studies tested it.

• Autopsy data. Lefèvre, Alvarez and Lorin de la Grandmaison (2015) reviewed 16 years of autopsies: 31 homicides, 103 sudden natural deaths with a fall, and 30 accidental falls. Wounds were more numerous and larger in homicides, and a statistical model using lacerations, deep bruises and intracranial trauma helped separate the groups. The hat brim line rule was not confirmed as a reliable discriminator.
• CT data. Henriques and colleagues (2023) studied 400 CT-scanned individuals aged 20 to 49, 235 falls and 165 blows, across 14 skeletal regions. They concluded the rule should be used with caution, and that fracture location and number may help.

A 2026 systematic review by Calabrese and colleagues reached the same place: the common methods each have limits, and several tools should be combined. For the record reviewer, that means the injury count, the size of each wound, the presence of deep bruising and intracranial injury, and the fracture pattern all need to be pulled from the chart, the imaging and any autopsy, together. An opinion that rests on location alone is exposed.

Older adults and rib fractures

In falls among older adults, the chest often decides the outcome. Bulger and colleagues (2000) compared 277 patients 65 or older with rib fractures against 187 patients aged 18 to 64 at a Level I trauma center over 10 years. The groups had similar injury severity (mean ISS 20.7 against 21.4; mean chest AIS 3.0 in both).

In an elder neglect or nursing home fall case, the rib count on the CT and the respiratory course become causation evidence; for the defense, the same study frames expected complications even with good care. See elder abuse and financial exploitation records for the wider elder file.

Motor vehicle crashes

In crashes, the run sheet's mechanism entries (ejection, rider separated from the vehicle, pedestrian struck, speed where recorded) come from the 2021 triage criteria and are often the first written account of the crash. When seating position is disputed, an expert will ask whether any patterned injury matches a restraint or vehicle part, which needs scaled photographs and the complete imaging. The motor vehicle accident record review page covers the wider file.

Crush

In crush cases, the time under load is the fact everything else hangs on. It lives in the run sheet, in extrication times, and in the fire or rescue report, which is a separate custodian. The inpatient chart then shows how the body responded, through lab trends, limb checks and any surgery. Put those on 1 clock before an expert opines on what earlier release would have changed. See crush injury record review.

The same records serve premises, crash, product and neglect claims on the civil side, and assault, homicide and abuse prosecutions on the criminal side. Civil records usually arrive by patient request, authorization or subpoena; criminal records by warrant, court order or grand jury subpoena, plus the medical examiner's file in a death.

In a criminal file the defendant is the accused, and every account in the records, the complainant's and the accused's alike, is a version to test against the injuries. Both sides depend on the same thin clinical descriptions. The side that reads them most closely usually has the better cross-examination.

How each side reads the same record

Statements in the chart

Emergency charts are full of statements about how an injury happened. Federal Rule of Evidence 803(4) excepts from the hearsay rule a statement made for, and reasonably pertinent to, medical diagnosis or treatment that "describes medical history; past or present symptoms or sensations; their inception; or their general cause." Courts differ on how far it reaches, especially for statements naming who caused an injury, and states have their own versions. Flag every causal statement with its speaker, listener, time and page, and leave admissibility to counsel.

How the records move

A patient has a right of access to their own records, and under 45 CFR 164.524 a covered entity generally must act on a request within 30 days. Law enforcement access runs through 45 CFR 164.512(f), which permits disclosure as required by law, including laws requiring the reporting of certain wounds or other physical injuries, and in compliance with a court order, warrant, judicial subpoena, grand jury subpoena, or qualifying administrative request. State law adds its own layers, and the medical examiner's records follow separate state rules. For the practical side, see how to get medical records for a lawsuit.

What the diagnosis codes do and do not say

Diagnosis codes look like findings. Read them with the FY 2026 ICD-10-CM Official Guidelines open:

• Intent defaults to accident. If intent is unknown or unspecified, it is coded as accidental. Undetermined intent is used only when the documentation says intent cannot be determined.
• Confirmed and suspected abuse are coded differently. Confirmed abuse uses category T74 and adds an assault external cause code and a perpetrator code when known. Suspected abuse uses T76 with no external cause or perpetrator code.
• Superficial injuries drop out. Abrasions and contusions are not coded when associated with more severe injuries of the same site.
• The 7th character tracks the encounter, not the injury. A means initial encounter with active treatment, D a subsequent encounter during healing, S a sequela.
• External cause codes are optional nationally. The guidelines state there is no national requirement for mandatory external cause code reporting, unless a state mandate or payer requires it. Their absence proves nothing.

A serious blunt trauma file can run to thousands of pages from many custodians. The first job is always 1 timeline and 1 injury list, every entry with a source. That is where AI medical record review earns its keep.

What an LLM does well on a trauma chart

• Reading and sorting. OCR plus a large language model can read typed and many handwritten entries, date them, sort them, and draft an AI medical chronology across custodians.
• Collecting every mention of an injury. Every place "scalp," "parietal" or "rib" appears, from the run sheet to discharge, pulled into 1 list with page cites. This is where differing sizes and labels between the ED note and a later report show up.
• Finding what is missing. A run sheet that mentions police photographs, a FAST with no stored images, a preliminary CT read with no final report.

Where it fails

• Photographs and body maps. An LLM reading a scanned body map sees marks and printed labels. It cannot reliably tell which side is which, measure a wound, or read a bruise. Nobody should let it age a bruise; the research says humans cannot do it reliably either.
• Handwritten forms. EMS and older trauma records are often handwritten or checkbox forms. OCR confidence drops on handwritten entries, and a misread GCS component changes a triage criterion. Low-confidence pages need a human read.
• Hallucination. A model can state an injury, a time or a quote that is not in the record. Without a page-level citation on every line, you cannot tell.
• Opinions. Blunt versus sharp, fall versus blow, and timing are expert opinions. Software can gather the facts under them. It should not state them.

In Mata v. Avianca (S.D.N.Y. 2023), the court imposed a $5,000 sanction under Rule 11 on lawyers who filed a brief citing 6 fabricated decisions produced by a chatbot. Medical facts carry the same risk. Human-in-the-loop means a person checks every line against its source page.

Ambient AI scribes and the notes of the next few years

Emergency departments are adopting ambient AI scribes that draft notes from the conversation in the room. Ask whether a scribe was used, whether the clinician edited the draft, and whether the draft still exists. A wound description is only as good as what the clinician saw and approved.

2 templates to copy. Adjust the legal basis to your jurisdiction and the route the records take.

PATIENT: [NAME], DOB [DATE]   DATE OF INJURY: [DATE]
CUSTODIAN: [HOSPITAL / EMS AGENCY / ME OFFICE / AGENCY]
BASIS: [45 CFR 164.524 ACCESS / AUTHORIZATION / SUBPOENA / ORDER]

For any item not produced, state in writing whether it exists,
where it is kept and why it is not produced.

EMS AND SCENE
[ ] Complete EMS patient care report, all pages, with attachments
[ ] Dispatch (CAD) record with call and arrival times
[ ] Fire or rescue report, extrication times (crush, crash)

HOSPITAL
[ ] Trauma activation record and the activation policy in effect
[ ] Trauma flowsheet, primary and secondary survey, serial GCS
    with components (E, V, M) and any NT entries
[ ] ED physician, nursing and procedure notes, with addenda
[ ] FAST report and stored ultrasound images
[ ] Clinical photographs in native format with metadata
[ ] Body map or injury documentation forms
[ ] CT and radiograph reports, preliminary and final, with order,
    scan and result times; DICOM images for every study
[ ] Operative notes, ICU flowsheets, discharge summary
[ ] Whether an ambient AI scribe drafted any note, and the draft
[ ] Trauma registry abstract, including AIS codes and ISS

FORENSIC (IF APPLICABLE)
[ ] Autopsy report, diagrams, photographs, toxicology
[ ] Forensic nurse or clinical forensic exam report and images

INJURY #: [N]   BODY REGION: [REGION]   SIDE: [L / R / MIDLINE]

SOURCE        | DATE/TIME | LABEL USED   | SIZE    | FEATURES DESCRIBED        | PAGE
EMS           | [ ]       | [ ]          | [ ]     | [ ]                       | [ ]
ED note       | [ ]       | [ ]          | [ ]     | [EDGES? BRIDGING? PATTERN?]| [ ]
Photograph    | [ ]       | n/a          | [SCALE? Y/N] | [PRE-REPAIR? Y/N]    | [IMG #]
CT report     | [ ]       | [ ]          | [ ]     | [ ]                       | [ ]
Autopsy       | [ ]       | [ ]          | [ ]     | [ ]                       | [ ]

FIRST RECORD SHOWING INJURY: [SOURCE, TIME, PAGE]
LAST RECORD SHOWING NO INJURY AT THIS SITE: [SOURCE, TIME, PAGE]
REPAIRED BEFORE PHOTOGRAPHED? [Y / N / UNKNOWN]
OPEN QUESTIONS FOR EXPERT: [ ]

• EMS run sheet, completeMechanism, position found, first GCS, triage criteria
• Dispatch and fire or rescue recordsSeparate custodians with independent clocks
• Trauma flowsheet with activation timeThe tightest clock in the chart
• GCS by componentE, V, M and any NT, never the total alone
• FAST images as well as the noteThe guideline expects stored images whenever feasible
• CT reports, preliminary and final, plus DICOMAddenda can add injuries
• Photographs before repairHospital, police, family; with scale and metadata
• Body map with orientation labelsCheck which side is which before flagging a conflict
• Every account of mechanism, in time orderSpeaker, listener, time, page
• Last record with no injury at each siteBounds timing without relying on color
• Trauma registry abstract with AIS codesRecompute the ISS yourself
• Autopsy file, if a deathReport, diagrams, photographs, toxicology

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What Medrecords AI does on a blunt trauma file

Medrecords AI works on the records you upload. It does not retrieve records, examine wounds, age bruises, sign opinions, score case merit or decide claims. What it does:

• Builds a cited medical chronology across EMS, ED, radiology, inpatient and forensic records, with a citation on every line to the source page.
• Reads typed pages, tables and handwritten entries with OCR that flags low-confidence pages for a human read, a real need on run sheets and checkbox forms.
• Flags records that should exist but were not produced, such as images a note refers to, each flag cited to the line that implies it, and undated documents that cannot be placed on the timeline.
• Answers questions from the record with cited answers: "every mention of the left scalp wound," "every account of the fall."

Flags are signals for a person to check, not findings; wound typing and mechanism stay with the experts. Medrecords AI is covered by SOC 2 and HIPAA, with a BAA. Self-Service bills 10 cents a deduplicated page, down to 5 cents at volume, duplicates free; Enterprise On-Prem is an annual license.

What is blunt force trauma?

Injury from impact with a blunt object or surface, such as a fall, blow, vehicle crash or crushing, rather than a cutting edge or point. It produces abrasions, contusions, lacerations and fractures, on the skin and inside the body.

What are the 4 types of blunt force injury?

Abrasions (scrapes), contusions (bruises), lacerations (tears of skin crushed by force) and fractures (broken bone).

What is the difference between a laceration and an incised wound?

A laceration is a tear from blunt force, often with abraded edges and tissue bridging across the wound. An incised wound is cut by an edge, longer than deep, with all tissue divided and no bridging. Clinical records often call both "lacerations."

Can a doctor tell how old a bruise is from its color?

Not reliably. A 2005 systematic review found clinicians aged bruises to within 24 hours with less than 40% accuracy and concluded bruises cannot be aged accurately in person or from photographs. A yellow color suggests a bruise is not recent, and that is about all color supports.

Can you tell a fall from a blow by injury location?

Not by location alone. Studies of autopsies and CT scans found the hat brim line rule should not be relied on as a stand-alone test. Experts combine the number and size of wounds, deep bruising, intracranial injury and fracture patterns.

What is an Injury Severity Score?

A score built from the Abbreviated Injury Scale: the squares of the highest AIS in the 3 most severely injured body regions, added together. Major trauma is usually an ISS of 16 or more. It is designed for comparing groups, not predicting 1 patient's outcome.

Why do the ER and the medical examiner describe the same wound differently?

They document for different purposes. A 2026 study found clinicians described wound margins in 1.9% of open wounds and forensic experts in 42.2%, while clinicians recorded size more often. Check what each author saw, and when.

Can AI read EMS run sheets and trauma records?

OCR and an LLM can read typed and many handwritten pages, but confidence drops on handwritten forms, and a misread GCS component can change a triage criterion. Use a tool that flags low-confidence pages and cites every line to its source page.

Can AI determine whether an injury was a fall or an assault?

No, and it should not try. Mechanism is an expert opinion. AI can gather the injury list, the scene facts and every account in time order, with citations, for an expert to weigh.

Is it safe to upload trauma photographs and records to an AI tool?

Only to HIPAA-compliant AI under a signed business associate agreement, with SOC 2, no training on your data, and an audit trail of AI use. Consumer chatbots do not meet that bar.

What happens if an AI chronology contains an error I rely on?

You own it. In Mata v. Avianca (S.D.N.Y. 2023), lawyers were sanctioned under Rule 11 for filing fabricated citations from a chatbot. Human-in-the-loop review of every cited line is the safeguard.

Every number in this guide was checked against the primary source linked below. Where a source could not be reached or a figure could not be confirmed, the figure was left out. Examples are hypothetical and use invented times and initials.

• Krywanczyk A. Blunt versus sharp force injuries: a primer on terminology. ASCP Lablogatory, 2023.
• Maguire S, Mann MK, Sibert J, Kemp A. Can you age bruises accurately in children? A systematic review. Arch Dis Child, 2005.
• Langlois NE. The science behind the quest to determine the age of bruises. Forensic Sci Med Pathol, 2007.
• Gyenes G and colleagues. Comparative terminological analysis of injury descriptions created by clinicians and by forensic experts based on clinical photographs in Germany. Forensic Sci Int: Synergy, 2026.
• Lefèvre T, Alvarez JC, Lorin de la Grandmaison G. Discriminating factors in fatal blunt trauma from low level falls and homicide. Forensic Sci Med Pathol, 2015.
• Henriques M and colleagues. Discrimination between falls and blows from the localization and the number of fractures on computed tomography scans of the skull and the trunk. Forensic Sci Res, 2023.
• Calabrese S and colleagues. Blunt force vs. fall-induced head trauma: a systematic review and methodological framework. Forensic Sci Med Pathol, 2026.
• Bulger EM, Arneson MA, Mock CN, Jurkovich GJ. Rib fractures in the elderly. J Trauma, 2000.
• Eidenbenz D and colleagues. Identification of major trauma using the simplified abbreviated injury scale. Scand J Trauma Resusc Emerg Med, 2025.
• Newgard CD and colleagues. National Guideline for the Field Triage of Injured Patients, 2021, published 2022; and the American College of Surgeons guideline page.
• Glasgow Coma Scale: what is GCS and FAQ.
• AIUM and ACEP. Practice guideline for the performance of the FAST examination, 2007.
• CMS. ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026.
• Federal Rules of Evidence 702 and 803; 45 CFR 164.512 and 164.524.
• Mata v. Avianca, Inc., S.D.N.Y., sanctions opinion, June 22, 2023.

What was left out. The commonly quoted 0 to 75 range of the ISS and the convention for AIS 6 injuries were not confirmed at a primary source, so this guide gives only the arithmetic. Hospital trauma activation tiers vary by institution and are not described in detail. Research on bruise visibility across skin tones was not reviewed here and should be checked before relying on it.

For related reading, see altered medical records, can AI read handwritten medical records, and medical examiner case record review.