Hinge Health

The computer vision is the engine of the exercise therapy module. TrueMotion, Hinge Health's own motion tracking technology, built on its 2021 acquisition of wrnch, uses a phone or tablet camera to track more than 100 reference points across the body in three dimensions, gives members real time audio and visual feedback on their form, and supplies the range of motion measures behind Movement Analysis and HingeScore (precision motion technology page).

That module does not exist without the model. The business around it is a care program: physical therapists, physicians and health coaches set and adjust care plans, and Enso, a nerve stimulation device, sits alongside. Remove the model and a care program remains. Robin, a virtual care assistant for members, is a second AI feature, and the model behind it is not described.

Motion data comes with a described oversight structure, and one channel is left without a routing rule. Physical therapists use TrueMotion's data to monitor and adjust care plans (precision motion technology page), and the approach to AI page says AI works alongside clinicians, surfacing insights and automating routine tasks. Robin is marketed as a 24/7 virtual care assistant for members. No published rule says what Robin may handle on its own, when it hands a member to a clinician, or what a member reporting an urgent symptom hears.

The approach is named and the version discipline is not. TrueMotion is camera based pose estimation from a phone or tablet, tracking more than 100 reference points across the body in three dimensions, with real time audio and visual feedback and Movement Analysis reporting range of motion; its provenance runs to the 2021 acquisition of wrnch. HingeScore, the progress measure members see, combines motion data with questionnaire answers, and its derivation and weighting are not published. The model behind Robin is not named. No versioning or update practice is published, so a buyer cannot tell when the measurement changed.

The core chain is structurally short and the rest of it is unnamed. TrueMotion is Hinge Health's own technology, built on its 2021 acquisition of wrnch, so the motion model is an in house build. Around it, the Notice of Privacy Practices says business associates help store data and bill health plans, and the privacy policy lists cloud service providers, data analytics providers and customer support partners among recipients, by category rather than by name. No subprocessor list, hosting provider or model provider is named, including for Robin, the member facing assistant, whose model is not described.

Hinge Health reports published research on its program, including randomized controlled trials and a 12 month outcomes study in BMC Musculoskeletal Disorders reporting pain reduced by more than half and sustained at one year. These studies evaluate the whole program, exercise therapy with clinician contact and coaching, so they do not isolate what the computer vision contributes.

The technology's own claim is stronger: the precision motion technology page says TrueMotion "eliminates doubt that the exercises are working", and it presents no validation of TrueMotion's measurement accuracy against laboratory motion capture or goniometry. HingeScore is described without a validation study. The program has research behind it; the headline claim about the technology goes untested.

The published practice is training use, stated plainly. The Notice of Privacy Practices says Hinge Health may use health information for training and using machine learning and artificial intelligence to analyze and process member content as part of its services, and may use de identified and aggregated data for research and to give customers insight into outcomes.

The privacy policy lists training its AI and machine learning tools among its uses, says it may record members' exercises with their consent, and states retention as "as long as is necessary". Its California section lists audio and visual data among categories disclosed to recipients including cloud service providers and marketing partners; that policy excludes protected health information, which the Notice governs.

Nothing published says whether exercise video from the phone camera is processed on the device or in the cloud, whether it is kept, or for how long. Plain wording does not change what members receive, which is a grant to train on their data. No safety engineering is published: no guardrails for Robin, the member facing assistant, and no account of how a safety event is handled.

Status is stated and supported by a substantive privacy document. Hinge Health's HIPAA Notice of Privacy Practices is issued by the Hinge Health affiliated covered entity, made up of its affiliated clinical entities, and names Hinge Health, Inc. and Hinge Health MSO, Inc. as affiliated business associate entities covered by its HIPAA compliance program. It says business associates help store data and bill health plans, and that they are required to protect member information. The website privacy policy excludes protected health information and points to that notice. For an employer or health plan buyer, the agreement itself and the tier it applies at are not published.

Recognized certifications are named without the artifacts. The security page names HITRUST CSF r2, SOC 2 Type 2 and ISO/IEC 27001:2022, and says independent penetration tests are run regularly. The company publishes no report, certificate, scope, date or trust portal, so each is available only on request, and the renewal dates cannot be checked from the page. As a company listed on the New York Stock Exchange, Hinge Health also describes its cybersecurity risk management in its annual report.

No device claim is made for the AI and no regulatory position is stated for it. Enso, the wireless electrical nerve stimulation device offered through the program, is marketed as FDA cleared; that clearance is for the stimulation device, not for TrueMotion, Movement Analysis, HingeScore or Robin, and none of those is labeled cleared.

TrueMotion measures range of motion that physical therapists use to adjust care plans, so the measurements have a reviewable basis, and nothing published says where the company places that function against device regulation.

Responsible AI is committed to in policy language with no evaluation behind it. The approach to AI page says the company's AI systems are rigorously tested and ethically managed so that biases are minimized, and commits to ongoing monitoring, evaluation and governance; it publishes no method, no results and no named process.

No subgroup results are published for TrueMotion, for example across body size, skin tone, clothing, mobility aids or home lighting, the conditions under which camera based pose estimation is known to vary, and a member tracked less accurately receives worse feedback and a less accurate HingeScore. The bias statement is a parity claim with no groups or counts behind it.

Mechanisms exist to challenge the output, with nothing standing behind it. Physical therapists review TrueMotion's data and adjust care plans, which puts a clinician between the measurement and the care decision. The Notice of Privacy Practices gives members the right to request corrections to their medical record; that corrects the record of care rather than what the AI measured, unless the measurements are themselves entered in that record, which is not stated.

No commitment on the output, such as a warranty, indemnity or remediation obligation for TrueMotion's measurements, HingeScore or Robin's answers, appears in the privacy policy, the Notice of Privacy Practices or the approach to AI page.

Integration is claimed without a system named. HingeConnect is described as integrating medical records, claims and prior authorization records with Hinge Health data to identify high risk members, deliver targeted care and guide member journeys, and its page names no record system, standard or deployment.

Hinge Health's clinical entities keep their own medical records, as the Notice of Privacy Practices describes, so the question here is exchange with systems outside the program: nothing published shows a member's assessment or progress reaching the record held by their own physician.

A single hosted service with its location unstated. TrueMotion runs through the Hinge Health app on the member's own phone or tablet camera, with no dedicated equipment, and the Notice of Privacy Practices says business associates help store the data and that cloud storage and servers are used.

Where member data rests, whether any processing crosses a border and how customers are kept apart are not published, although the company runs programs outside the United States (Hinge Health Global).

No price is published. Hinge Health sells its program to employers and health plans as a member benefit, with pages for employers, health plans and benefits consultants and an eligibility check for members, so the way it is sold is clear before contact: a sponsored benefit with no member facing price and negotiated buyer terms.

What drives the cost is not published: whether fees run per enrolled member, per engaged member or per eligible life, whether any part of the fee is at risk against outcomes, and how Enso is supplied. The company is listed on the New York Stock Exchange, so aggregate revenue and customer figures appear in its public filings, which do not give per contract terms.

Coverage is named by program: joint and muscle pain, pelvic health, migraine, and balance and fall prevention, each with its own page, offered to members of employer and health plan benefits. The site also has routes for providers (HingeSelect), ecosystem partners and an international program (Hinge Health Global). Validation sits behind part of it: the published outcome research the company reports covers its musculoskeletal program.