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An assessment in front of 4DEYE installed in a rehabilitation room

Clinics and hospitals

From 5-minute motion analysis to digital therapeutic, on one system

4DEYE Dx, an MFDS Class II medical device, finds joint path deviations and compensation in five minutes. 4DEYE DTx, with its confirmatory trial completed, continues rehabilitation at home. You subscribe instead of buying, and hospitals recovered it within 3 weeks to 3 months.

Upfront cost
Zero · subscription
Payback period
3 weeks – 3 months (measured)
Evidence
6 SCI papers · confirmatory trial completed
Approval · billing code
MFDS Class II · EZ774

Dx + DTx

Dx runs the assessment. DTx takes it from there.

One flow, not two products. The assessment pinpoints compensation and joint dysfunction, and targeted exercise is prescribed. Patients continue on the same data after discharge, so the hospital can add rehab management revenue to assessment revenue.

  1. 4DEYE Dx

    5-minute motion analysis

  2. 4DEYE Dx

    Compensation and function analysis

  3. 4DEYE Dx

    Report · PACS · claims

  4. 4DEYE DTx

    Digital therapeutic prescription

  5. 4DEYE DTx

    Exercise scoring · re-assessment

Monitoring results set the baseline for the next 4DEYE Dx assessment, closing the loop.

4DEYE Dx — finds the problem

Five minutes in clinic to find where the joint leaves its path, recorded in a report.

4DEYE DTx — carries it on

The clinician prescribes exercise for the problems found. A home camera scores each session, and results return to the clinician’s dashboard.

Rehabilitation medicine · physiotherapy

We put numbers on what you already see

You already assess compensation by eye and hand, and you are usually right. But those findings go undocumented, vary between therapists and are not tracked over time.

  • 01

    One simple movement is enough

    A single simple movement, like raising the arm forward, automatically shows where the joint leaves its path.

  • 02

    The report is written for you

    Results fit on one page and link directly to PACS and insurance claims, cutting paperwork for physiotherapists.

  • 03

    You see what was done at home

    A home camera scores prescribed exercises, and adherence and pain changes flow into your dashboard.

A 4DEYE joint function report showing compensation detection angles, overall grade, range of motion, left–right asymmetry, and tight and weak muscles
Joint function report — compensation by segment, left and right grades, range of motion, asymmetry, and tight and weak muscles on one screen.

Orthopedics

Before and after procedures, on one yardstick

Surgery and injections reduce pain, but whether the joint moves properly again is a separate question. If compensation remains, the problem returns.

  • 01

    Function and pain, seen separately

    A lower VAS does not mean function has returned. Range of motion, alignment, left–right difference and compensation are each measured.

  • 02

    The pre-operative state stays on record

    A five-minute pre-op assessment sets the baseline for the whole recovery.

  • 03

    No extra consultation time

    The physician orders it, the physiotherapist runs it, and you read the report.

Diagram comparing the normal and compensatory paths when the knee bends
Shows whether the thigh bone follows its normal path as the knee bends, or drifts off it.

4DEYE DTx

Rehab usually ends at discharge

No one knows what exercise was done, and the next visit brings only “a bit better.” 4DEYE DTx fills that gap with data. Unlike exercise apps, its effect was shown in a confirmatory trial.

  • The prescription travels

    Pick exercises to match the results, set sets, reps and frequency, and the plan goes to the patient’s phone. No paper handouts.

  • A camera scores the motion

    At home, the camera scores posture accuracy and corrects errors on the spot.

  • You see who slipped

    Adherence and pain (NRS) trends on one screen. AI flags drop-offs; send a reminder by KakaoTalk or text.

More on 4DEYE DTx

Evidence on our own product

Accuracy first, then effect — proven in order

Five papers show accurate, repeatable measurement against VICON, from single joints to whole-body movement. The sixth shows exercise content built on it corrects posture.

Same motion, VICON vs. 4DEYE: how close are the values?

ICC near 1.00 means values match VICON. ≥ 0.75 is "good"; ≥ 0.90 is "excellent".

0
Poor0.5
Moderate0.75
Good0.9
Excellent

Concurrent validity

ICC 0.75–0.99

Hip, knee and trunk measured together · Applied Sciences 2024

Angle-trajectory validity

ICC 0.86–1.00

Sitting, standing and squats · Journal of Human Kinetics 2023

Test–retest reliability

ICC 0.68–0.99

Same motion, same value on retest · Sensors 2023 · JHK 2023

ICC near 1.00 means close agreement with VICON — not that a treatment works. We keep the two claims separate.

How each one measures

VICON

  • Reflective markers on every joint
  • Infrared cameras in a dedicated lab
  • 20–30 min setup

4DEYE

  • Nothing attached to the body
  • Five RGB cameras, existing rehab room
  • 5-minute test

Beyond measurement — effect, too

In a cluster RCT of 36 adolescents (Medicine, IF 1.4), digital exercise content alone improved posture about as much as in-person therapist coaching.

Knee pain confirmatory trial, on our product

Prof. Lee Byung-hoon’s team, Orthopaedic Surgery, Gachon University Gil Medical Center · Single-centre · assessor-blinded · parallel-group · ITT · n=151 (78 vs 73) · 12 weeks

Prescribed rehab exercise in front of a mounted tablet
Participants exercise in front of a mounted tablet; the camera corrects their form in real time.

Primary endpoint · KOOS-12 function score

+5.24P < .001

Secondary outcomes improved too

  • Quality of life (SF-12 physical) +7.35 · mental +5.83
  • Knee flexion ROM +3.08°
  • Adherence 81.4% (control 77.2%)

IRB GCIRB2025-212 · CRIS KCT0011905

Six SCI(E) papers, in Sensors, Applied Sciences, Journal of Human Kinetics, Medicine and more.

All papers and trials

Clinical and public partners

Research in hospitals, results in the field

University hospital teams and an open lab validate performance and safety; a public education programme tests it in the field.

Real payback periods

Payback in three weeks to three months

Not projections: based on actual assessment volumes. Hospital names are initials per contract.

Bundang Hospital B passes 1,500 assessments a month

At a single hospital, in one month.

Cumulative payback at three hospitals: Bundang Hospital B 266% in three weeks, Ansan Hospital O 193% in two months, Seoul Hospital C 100% in three months. All reached break-even.0%100%200%Break-even100%StartMonth 1Month 2Month 3266%193%100%
  • Bundang Hospital B
  • Ansan Hospital O
  • Seoul Hospital C
Cumulative monthly payback. Volumes vary by hospital, so payback periods vary too.

  • Bundang Hospital B

    266% in three weeks

    266% of the purchase price recovered in three weeks, from 1,278 assessments. Monthly volume passed 1,500 as of Sep 2026.

    Payback
    266%
    Time to payback
    3 weeks

  • Ansan Hospital O

    193% in two months

    Payback rose from 62% to 193% in two months; monthly volume from 182 to 422 (Sep 2026).

    Payback
    193%
    Time to payback
    2 months

  • Seoul Hospital C

    100% in three months

    Full purchase price recovered in three months. Monthly volume reached 312 as of Sep 2026.

    Payback
    100%
    Time to payback
    3 months

No upfront cost. Profit from the first patient.

Upfront cost
KRW 0. Subscription, no equipment to buy
Billing
Per assessment; rate drops as volume grows
Term
36 months, monthly minimum
Break-even
No upfront spend. Profit from the first patient

Rates and monthly minimums depend on hospital size and joints in use. We cover them in a consultation.

Hospital management

Know when it pays back, in numbers

Every assessment is logged automatically, so you track operations in real figures, not guesses.

  • 01

    The assessment leads to further care

    Findings lead to physiotherapy, then orthopedic consultation and procedures. Post-surgical recovery management becomes billable too.

  • 02

    Claims backed by numbers

    Measured values, not impressions, make the test’s need and results easy to explain.

Clinical staff running 4DEYE in a hospital rehabilitation room

Billing

The billing basis is already in place

4DEYE Dx is an MFDS Class II medical device. Motion analysis (biomechanical testing) is billable under non-covered service code EZ774. GMP and ISO 13485 certified.

Each institution sets and posts its own non-covered fees. We do not set them; we help your staff fit the test set-up and code to your clinical protocol.

Features by use

Clinical motion analysis is different, feature by feature

The wellness edition for sports, schools, industry and senior care involves no medical judgement: it offers posture and posture type data, growth prediction, a personalized exercise app, and injury-risk screening in sports. Joint-by-joint motion analysis, clinical use and claims, and digital therapeutic prescription are clinical edition only.

Clinical edition

4DEYE Dx (MFDS-approved medical device) / DTx

Wellness edition

For sports, schools, industry and seniors · non-medical

Motion analysis · clinical use

  • Single- and multi-joint motion analysis

    Range of motion · compensation · left–right asymmetry

    IncludedNot included

  • Movement screening

    Injury-risk screens such as Y-balance and overhead squat · sports only

    IncludedIncluded

  • Tight and weak muscles · risk grade

    Findings that support clinical judgement

    IncludedNot included

  • Hand function test

    Detailed finger, wrist and elbow analysis · separate attachment

    Separate subscriptionNot included

  • Report linked to PACS and claims

    Connected to medical records and billing

    IncludedNot included

Treatment · follow-through

  • Digital therapeutic prescription

    Clinician-prescribed · camera scoring · confirmatory trial evidence

    IncludedNot included

  • Personalized exercise app

    Exercise matched to results · adherence tracking

    IncludedIncluded

Posture

  • Current posture measurement

    3 seconds · coronal, sagittal and transverse alignment

    IncludedIncluded

  • Posture type classification

    Forward head · rounded shoulders · pelvic tilt and more

    IncludedIncluded

  • Measurement data · trends

    Individual and group records on one yardstick

    IncludedIncluded

Growth · vital signs

  • Growth prediction model

    Growth trends for students · in use in schools

    IncludedIncluded

  • Heart rate · respiratory rate

    Contactless, via remote photoplethysmography (rPPG) from camera video

    Coming soonComing soon

  • Heart rate variability (HRV) · stress index

    Based on LF/HF and SDNN

    Coming soonComing soon

  • Blood pressure · oxygen saturation

    Collected during the same session

    Coming soonComing soon

Contactless vital signs are developed and launching soon; the wellness edition shows them as reference indicators without medical judgement. Hand function testing needs a separate attachment and subscription.

The consultation includes a live assessment and a payback simulation based on your hospital’s size and the joints you plan to assess.

Talk to usApprovals and evidence

Also for

Show patients the movement they can’t see

See a live assessment, terms sized to your hospital, and a payback simulation.

Talk to usGet the brochure