Forensic Gait Analysis of Surveillance Video in Injury and Workers' Comp Cases.
Surveillance footage is evidence — and like all evidence, it can be misread by either side. Dr. Michael S. Nirenberg, a board-certified forensic podiatrist, analyzes how a claimant walks, stands, lifts, climbs, and bears weight, frame by frame, and compares the footage against the claimed injury and limitations.
Retained by attorneys, the methodology is identical regardless of which side has retained the work. The opinion follows the evidence — which is what makes the analysis durable when challenged.
Forensic Podiatry Services
Forensic experience trusted by attorneys, the Department of Justice, and law enforcement.
- Expert assistance provided to the Federal Bureau of Investigation (FBI), the U.S. Department of Justice (DOJ), U.S. and Canadian law enforcement agencies, and attorneys representing plaintiffs, defendants, and insurers in civil and criminal matters
- 33+ years in practice
- Board-certified in Primary Care in Podiatric Medicine and Foot & Ankle Surgery, American Board of Multiple Specialties in Podiatry
- Co-editor of the textbook “Forensic Gait Analysis: Principles and Practice,” Taylor & Francis CRC Press
- Over 50 publications; serves as an editor for The Journal of the American Podiatric Medical Association and Science & Justice
- Provided over 100 educational presentations, including to forensic experts, law enforcement, podiatrists, and the public
Forensic Gait Analysis of Surveillance Video in Injury and Workers' Comp Cases.
Are the alleged injuries and limitations supported by what the footage actually shows?
Surveillance footage is evidence — and like all evidence, it can be misread by either side. Dr. Michael S. Nirenberg, a board-certified forensic podiatrist, analyzes how a claimant walks, stands, lifts, climbs, and bears weight, frame by frame, and compares the footage against the claimed injury and limitations.
Retained by attorneys, the methodology is identical regardless of which side has retained the work. The opinion follows the evidence — which is what makes the analysis durable when challenged.
Forensic experience trusted by attorneys, the Department of Justice, and law enforcement.
- Expert assistance provided to the Federal Bureau of Investigation (FBI), the U.S. Department of Justice (DOJ), U.S. and Canadian law enforcement agencies, and attorneys representing plaintiffs, defendants, and insurers in civil and criminal matters
- 33+ years in practice
- Board-certified in Primary Care in Podiatric Medicine and Foot & Ankle Surgery, American Board of Multiple Specialties in Podiatry
- Co-editor of the textbook "Forensic Gait Analysis: Principles and Practice," Taylor & Francis CRC Press
- Over 50 publications; serves as an editor for The Journal of the American Podiatric Medical Association and Science & Justice
- Provided over 100 educational presentations, including to forensic experts, law enforcement, podiatrists, and the public
Three things video can reveal — when read by a qualified expert.
Gait is the manner of walking, stepping, weight-bearing, and carriage. It carries objective biomechanical signatures that are difficult to fake convincingly — and equally difficult to read accurately without specialized training. A forensic podiatrist can determine whether surveillance footage is consistent with the medical record, contradicts it, or has been mischaracterized by either side.
The Manner of Walking
Frame-by-frame documentation of stance phase, swing phase, heel contact, foot-flat, toe-off, base of gait, arm swing, head and torso position, joint motion, balance, symmetry, and pace. The analysis documents what the video shows — whether it supports the claim, undermines it, or has been overstated by either party.
Weight-Bearing & Function
Is the claimant truly avoiding weight on the injured limb, or compensating for it? Can the claimant perform tasks a physician indicated were not possible — or, conversely, is brief incidental activity being misread as proof of full function? The footage is measured against the medical records and sworn testimony with specific timestamps.
Assistive Devices & Context
Cane use, braces, footwear, environmental conditions, distance, duration, and effort all matter. A claimant who walks unaided for ten seconds on flat ground has not necessarily disproved a back injury. A claimant who jogs for a city block likely has. The analysis separates the two with rigor.
What the record reflected. What the video actually showed.
Surveillance can reveal exaggeration. It can also be cherry-picked, taken out of context, or read by a non-expert as proof of function the footage does not actually demonstrate. A rigorous forensic gait analysis distinguishes the two.
The same frame-by-frame methodology that can identify a malingering claimant can also support a genuinely injured claimant against a misleading edit, a brief clip without context, or an investigator's report that overstates what the footage shows.
Built to withstand challenge — from either side.
Every analysis is documented, reproducible, anchored in the medical record and the peer-reviewed literature, and prepared with the understanding that opposing counsel will attempt to impeach it at deposition or trial. Findings are stated only to the extent the evidence supports them.
Scoped Intake
Case posture is reviewed with retaining counsel — alleged injury, reported restrictions, surveillance windows, and the specific questions the trier of fact must answer. No opinion is offered before the materials are reviewed.
Complete Record Review
All medical records, IME and IPE reports, depositions, and surveillance footage are reviewed in full — not just the segments either side has highlighted. Selective review is a vulnerability on cross.
Documented Gait Analysis
Stance and swing phases, weight-bearing, symmetry, joint motion, assistive-device use, and environmental context documented with timestamps and frame references. Every finding is traceable back to the footage.
Defensible Written Opinion
A clear, citation-ready report grounded in the medical record and the peer-reviewed forensic gait literature. Opinions are stated to a reasonable degree of medical certainty — no further. Available for deposition and trial testimony.
The footage doesn't favor either side. The opinion shouldn't either. The methodology is what holds up under cross-examination.
Retained by attorneys on either side of the v. Same methodology.
A forensic opinion is only as valuable as its credibility on the stand. Findings are not adjusted to fit the retaining party — and counsel on both sides retain us precisely for that reason.
Supporting genuine injury.
- Rebuttal of investigator reports that overstate or mischaracterize the footage
- Identification of antalgic gait, compensatory movement, and pain behaviors visible on video
- Context-restoration for clips presented out of duration, distance, or environmental context
- Response to opposing gait, biomechanical, or surveillance-based expert opinions
Documenting inconsistency.
- Independent expert opinion to support IME conclusions or rebut treating-physician findings
- Frame-by-frame documentation suitable for motion practice and trial exhibits
- Cross-referencing of surveillance to deposition testimony and medical records
- Referrals on suspected malingering or material misrepresentation
Where surveillance gait analysis makes a difference.
We accept cases from attorneys, third-party administrators, self-insured employers, insurance carriers, and government agencies. Common matters include:
Workers' Compensation
Disputed lower-extremity injuries, CRPS/RSD claims, permanency and restriction disputes, return-to-work determinations, IME corroboration, and IME rebuttal.
Personal Injury & Auto
MVA cases involving foot, ankle, knee, hip, or back injuries where surveillance has been obtained and the extent of impairment is contested by either side.
Premises Liability & Slip and Fall
Cases where claimed gait impairment, balance problems, or post-fall limitations are either supported or appear inconsistent with documented activity on video.
Long-Term & Short-Term Disability
Disability claim investigations and appeals where surveillance behavior is being weighed against reported functional capacity and treating physician opinions.
SIU & Fraud Investigations
Insurance Special Investigations Unit referrals requiring a credentialed expert opinion before a denial, referral, or fraud action — and rebuttal of the same.
Social Security & Veterans' Disability
Administrative hearings and appeals where gait, weight-bearing, and functional limitations are central to the disability determination.
Questions counsel tend to ask first.
If you don't see your question here, reach out directly. Most case-fit conversations take fifteen minutes or less.
Send the footage. We'll tell you what it actually shows.
A short conversation is usually enough to determine whether forensic gait analysis will help your matter. Reach out with a brief description of the case. We respond within one business day.
Start a Case Review →Forensic Gait Analysis of Surveillance Video in Injury and Workers' Comp Cases.
Are the alleged injuries and limitations supported by what the footage actually shows?
Surveillance footage is evidence — and like all evidence, it can be misread by either side. Dr. Michael S. Nirenberg, a board-certified forensic podiatrist, analyzes how a claimant walks, stands, lifts, climbs, and bears weight, frame by frame, and compares the footage against the claimed injury and limitations.
Retained by attorneys, the methodology is identical regardless of which side has retained the work. The opinion follows the evidence — which is what makes the analysis durable when challenged.
Forensic experience trusted by attorneys, the Department of Justice, and law enforcement.
- Expert assistance provided to the Federal Bureau of Investigation (FBI), the U.S. Department of Justice (DOJ), U.S. and Canadian law enforcement agencies, and attorneys representing plaintiffs, defendants, and insurers in civil and criminal matters
- 33+ years in practice
- Board-certified in Primary Care in Podiatric Medicine and Foot & Ankle Surgery, American Board of Multiple Specialties in Podiatry
- Co-editor of the textbook "Forensic Gait Analysis: Principles and Practice," Taylor & Francis CRC Press
- Over 50 publications; serves as an editor for The Journal of the American Podiatric Medical Association and Science & Justice
- Provided over 100 educational presentations, including to forensic experts, law enforcement, podiatrists, and the public
Three things video can reveal — when read by a qualified expert.
Gait is the manner of walking, stepping, weight-bearing, and carriage. It carries objective biomechanical signatures that are difficult to fake convincingly — and equally difficult to read accurately without specialized training. A forensic podiatrist can determine whether surveillance footage is consistent with the medical record, contradicts it, or has been mischaracterized by either side.
The Manner of Walking
Frame-by-frame documentation of stance phase, swing phase, heel contact, foot-flat, toe-off, base of gait, arm swing, head and torso position, joint motion, balance, symmetry, and pace. The analysis documents what the video shows — whether it supports the claim, undermines it, or has been overstated by either party.
Weight-Bearing & Function
Is the claimant truly avoiding weight on the injured limb, or compensating for it? Can the claimant perform tasks a physician indicated were not possible — or, conversely, is brief incidental activity being misread as proof of full function? The footage is measured against the medical records and sworn testimony with specific timestamps.
Assistive Devices & Context
Cane use, braces, footwear, environmental conditions, distance, duration, and effort all matter. A claimant who walks unaided for ten seconds on flat ground has not necessarily disproved a back injury. A claimant who jogs for a city block likely has. The analysis separates the two with rigor.
What the record reflected. What the video actually showed.
Surveillance can reveal exaggeration. It can also be cherry-picked, taken out of context, or read by a non-expert as proof of function the footage does not actually demonstrate. A rigorous forensic gait analysis distinguishes the two.
The same frame-by-frame methodology that can identify a malingering claimant can also support a genuinely injured claimant against a misleading edit, a brief clip without context, or an investigator's report that overstates what the footage shows.
Built to withstand challenge — from either side.
Every analysis is documented, reproducible, anchored in the medical record and the peer-reviewed literature, and prepared with the understanding that opposing counsel will attempt to impeach it at deposition or trial. Findings are stated only to the extent the evidence supports them.
Scoped Intake
Case posture is reviewed with retaining counsel — alleged injury, reported restrictions, surveillance windows, and the specific questions the trier of fact must answer. No opinion is offered before the materials are reviewed.
Complete Record Review
All medical records, IME and IPE reports, depositions, and surveillance footage are reviewed in full — not just the segments either side has highlighted. Selective review is a vulnerability on cross.
Documented Gait Analysis
Stance and swing phases, weight-bearing, symmetry, joint motion, assistive-device use, and environmental context documented with timestamps and frame references. Every finding is traceable back to the footage.
Defensible Written Opinion
A clear, citation-ready report grounded in the medical record and the peer-reviewed forensic gait literature. Opinions are stated to a reasonable degree of medical certainty — no further. Available for deposition and trial testimony.
The footage doesn't favor either side. The opinion shouldn't either. The methodology is what holds up under cross-examination.
Retained by attorneys on either side of the v. Same methodology.
A forensic opinion is only as valuable as its credibility on the stand. Findings are not adjusted to fit the retaining party — and counsel on both sides retain us precisely for that reason.
Supporting genuine injury.
- Rebuttal of investigator reports that overstate or mischaracterize the footage
- Identification of antalgic gait, compensatory movement, and pain behaviors visible on video
- Context-restoration for clips presented out of duration, distance, or environmental context
- Response to opposing gait, biomechanical, or surveillance-based expert opinions
Documenting inconsistency.
- Independent expert opinion to support IME conclusions or rebut treating-physician findings
- Frame-by-frame documentation suitable for motion practice and trial exhibits
- Cross-referencing of surveillance to deposition testimony and medical records
- Referrals on suspected malingering or material misrepresentation
Where surveillance gait analysis makes a difference.
We accept cases from attorneys, third-party administrators, self-insured employers, insurance carriers, and government agencies. Common matters include:
Workers' Compensation
Disputed lower-extremity injuries, CRPS/RSD claims, permanency and restriction disputes, return-to-work determinations, IME corroboration, and IME rebuttal.
Personal Injury & Auto
MVA cases involving foot, ankle, knee, hip, or back injuries where surveillance has been obtained and the extent of impairment is contested by either side.
Premises Liability & Slip and Fall
Cases where claimed gait impairment, balance problems, or post-fall limitations are either supported or appear inconsistent with documented activity on video.
Long-Term & Short-Term Disability
Disability claim investigations and appeals where surveillance behavior is being weighed against reported functional capacity and treating physician opinions.
SIU & Fraud Investigations
Insurance Special Investigations Unit referrals requiring a credentialed expert opinion before a denial, referral, or fraud action — and rebuttal of the same.
Social Security & Veterans' Disability
Administrative hearings and appeals where gait, weight-bearing, and functional limitations are central to the disability determination.
Questions counsel tend to ask first.
If you don't see your question here, reach out directly. Most case-fit conversations take fifteen minutes or less.
Send the footage. We'll tell you what it actually shows.
A short conversation is usually enough to determine whether forensic gait analysis will help your matter. Reach out with a brief description of the case. We respond within one business day.
Start a Case Review →
Footprint expert witness assistance is offered by Dr. Nirenberg in criminal matters where a footprint or footwear (including a shoe or shoes) is associated with a crime or criminal activity. As a clinical and forensic podiatrist with over 30 years in private practice, Dr. Nirenberg uses this combined skill-set to analyze foot and ankle issues.
Footprint expert witness issues involve footprint and/or footwear (and also gait) to help with criminal investigations generally.
In some cases that Dr. Nirenberg assisted with a criminal left footwear at the crime scene and Dr. Nirenberg’s analysis showed that the criminal’s foot/feet could have worn the shoe (or shoes). Other cases have involved a footprint or footprints found at a crime scene. A footprint impression may be found on surfaces, in sand, or even inside a shoe.
When one footprint is found at a crime scene, careful examination may find other footprints. Research has shown that footprints may have significant individuality, as well as differences between a person’s right and left footprints.
Role of a Footprint Expert Witness
As a podiatrist or podiatry expert with knowledge, education and experience in forensics, Dr. Nirenberg may be able to provide analysis of footprints believed to be made by the criminal or perpetrator of a crime. Sometimes a crime may involve trauma to a person. This type of criminal case can create blood at the crime scene and when a person walks or stands in the blood, a footprint or pattern of footprints may result.
While a lone footprint may be able to show a particular suspect or person was possibly at the crime scene, a pattern of footprints may increase the evidentiary value of showing a particular person made the footprints. Or a pattern may suggest activity that occurred during the crime.
Types of Cases that Involve a Footprint Expert Witness
Beyond blood-soaked footprints, a footprint can also result from walking in other substances, including snow, sand, mud, or even paint. It important that law enforcement recognize the importance of a criminal or perpetrator’s footprint is present at a crime scene and take the appropriate measures to preserve the footprint for future footprint analysis.
Footprint analysis performed by a forensic podiatrist allows for possible insight into the foot of the person who made the footprint. As specialists in the foot, forensic podiatrists generally have knowledge of both the human foot, including its biomechanics, pathology, ailments and so on, and also forensic science.
Podiatrists generally complete an undergraduate degree before going on to spend four years more to become a Doctor of Podiatric Medicine. This process often involves podiatrists gaining a detailed, through knowledge of the human foot. Footprints can be analyzed and compared with footprints made by a suspect or person of interest and also compared to the person’s feet.
Footprint criminal cases may range from homicide or murder to rape, assault or robbery. Just about any crime where a footprint or footwear (or a shoe) is found.
Who is a Footprint Expert Witness?
Footprint analysis in criminal matters should ideally be undertaken by podiatrists (or other persons) who have both forensic experience and knowledge and also have experience, knowledge of the human foot.
A podiatrist (or podiatry expert) is a doctor of podiatric medicine (DPM), who treats the foot, ankle, and related structures in the leg. Podiatrists’ training involves learning about many issues that affect the human foot, including the foot’s 26 bones, many joints, many muscles, as well as knowledge of gait–of how we walk.
A lack of such knowledge in forensic science or the detailed complexity of the human foot and the myriad problems that affect feet. Podiatrists’ education and training includes biomechanics, pathology, anatomy, physiology, treatment of foot problems (including foot and ankle surgery).
Footprint Expert Witness Qualifications
Dr. Nirenberg has spent over 30 years treating patients in his podiatry practice. This follows a medical education and residency in podiatric surgery. With his knowledge of forensics and crime, Dr. Nirenberg can put this knowledge to work with a criminal case involving footprints.
Dr. Nirenberg is board certified, Americam Board of Multiple Specialties in Podiatry, Foot & Ankle Surgery and Primary Care in Podiatric Medicine, and he serves as president of the American Society of Forensic Podiatry and served on the Forensic Podiatry Subcommittee of the International Association for Identification (IAI), and currently serves on the IAI’s General Forensics Science and Practice Subcommittee.
Dr. Nirenberg also serves on the editorial boards of Science & Justice (journal of the Chartered Society of Forensic Sciences) and the Journal of the American Podiatric Medical Association (forensic podiatry and nerve surgery), and he is Chair of the Exploratory Task Group on Gait Analysis within the Organization of Scientific Area Committees (OSAC) for Forensic Science.
Dr. Nirenberg has also served as an invited peer reviewer for forensic and medical journals, including the Journal of Forensic Science and Medicine, Forensic Science International, and The Lancet — one of the highest ranked medical journals.
Dr. Nirenberg was the first podiatric medical student to have a paper accepted for publication as a student (without a physician co-author) by the Journal of the American Podiatric Medical Association, whose editor made a special exception to publish his paper.
Dr. Nirenberg has been awarded the Distinguished Podiatric Medical Writing Award for his paper, “Forensic Methods and the Podiatric Physician”.
Dr. Nirenberg has also lectured on forensics, including providing presentations at the International Association for Identification and the American Academy of Forensic Sciences.
Beyond the USA, Dr. Nirenberg has provided forensic and/or medical related presentations for persons in Canada, India, Israel and Spain, and have lectured to professional trackers, police, attorneys, and has assisted in the training of podiatric residents.
He has also assisted law enforcement in the USA and Canada as a podiatry expert witness in the analysis of foot and gait-related evidence in criminal matters and provided review/verification of forensic reports for criminal cases in the United Kingdom (UK).
In the undertaking as a podiatry expert witness to determine if persons may have been wrongfully convicted, he has examined gait/pedal evidence for agencies in Commonwealth of Massachusetts, New York, California and Iowa. In 2022, his assistance contributed to the exoneration of a wrongfully convicted person.
Footprint Expert Witness Research
Dr. Nirenberg has authored or co-authored over 40 medical or forensic publications (or accepted publications) and/or short communications. Among these publications are some that involve research into footprints and footwear in the forensic or criminal context:
- Nirenberg M.S., Ansert E., Reel S., “Reliability of a two-dimensional sock-clad footprint linear measurement method,” Science & Justice, 2021 Sep 1;61(5):649-56.
- Nirenberg M.S., “Footwear-to-Feet Examination and Analysis: Comparing Worn Footwear to Persons and Human Remains,” Science & Justice (online 11/23/2022).
- Ansert E., Nirenberg M.S., et al., “Ghosting Phenomenon in Static and Dynamic Footprints in India and the United States,” Science & Justice, 2023 May, 65(3);406-413.
- Nirenberg M.S., Ansert E., Campbell J., Curran M., “Chasing Ghosts: An Investigation of the Ghosting Phenomenon in Footprints,” Science & Justice, 2020 Sep, 60(5):432-7.
- Mukhra R., Krishan K., Nirenberg M., et al. “The Contact Area of Static and Dynamic Footprints – Forensic Implications,” Science & Justice, 2021 Mar 1;61(2):187-92.
- Mukhra R., Krishan K., Nirenberg M.S., Ansert E., Kanchan T., (2020). Comparative analysis of static and dynamic bare footprint dimensions in a north Indian population, Forensic Science International, 2020 Mar 1: 308: p. 110169
- Nirenberg M.S., Ansert E., Krishan K., Kanchan T. “Two-Dimensional Metric Comparisons between Dynamic Bare Footprints and Insole Foot Impressions – Forensic Implications,” Science & Justice, 2020, 60 (2), pp. 145-150.
- Nirenberg, M.S., Ansert, E., Krishan, K. and Kanchan, T., “Two-dimensional linear analysis of dynamic bare footprints: A comparison of measurement techniques,” Science & Justice, 2019, Vol. 59, Issue 5, pp. 552-557.
- Nirenberg, M.S., Ansert, E., Krishan, K. and Kanchan, T., “Two-dimensional metric comparisons between dynamic bare and sock-clad footprints for its forensic implications–A pilot study,” Science & Justice, 2019, Vol. 59, Issue 1, pp. 46-51.
- Nirenberg, M.S., Krishan K., Kanchan T. “A metric study of insole foot impressions in footwear of identical twins,” Journal of Forensic and Legal Medicine, 2017; 52:116-121.
Dr. Nirenberg is a co-editor of the textbook “Forensic Gait Analysis: Principles and Practice,” published by Taylor & Francis CRC Press.
Footprint Expert Witness Analysis in Media
To learn more about footprints and Dr. Nirenberg’s interest in the analysis of footprints in criminal cases, you can visit the following:
A&E TV True Crime Blog – What’s a ‘Shoe Autopsy’?
Gait, Footprints, and Footwear: How Forensic Podiatry Can Identify Criminals
To put Dr. Nirenberg’s clinical and forensic footprint expert witness experience to work for you, email him at forensic@friendlyfootcare.com or call his office at (219)663-2273.
