EMET Education
Musculoskeletal
Shoulder
Shoulder osteoarthritis

3D model · Shoulder

Shoulder Osteoarthritis 3D Model

Reproduce your patient's osteoarthritis during the visit, concentric or eccentric, and show in 3D the arthroplasty you recommend. They leave with their model on their phone.

Customize the lesions

Opens in your browser, no sign-up. For orthopedic surgeons, rheumatologists, sports medicine physicians, physiatrists, radiologists and primary care physicians.

The patient understandsTheir lesions, reproduced from their imaging, on a model they handle themselves.
Reassured, ready to decideThey review the proposed treatment at home before giving consent.
Documented informationVisit saved and dated: a record of the information you provided.
In their language🇫🇷 🇬🇧 🇪🇸 🇷🇺

How it works

In the visit, in three steps

Structured information in a few minutes, which the patient can review at home.

1
Show

Open the model and walk through the anatomy: humeral head and glenoid, their cartilage, the acromion and the coracoid.
2
Reproduce

Set the osteoarthritis from the radiograph: concentric per Samilson and Prieto, eccentric per Hamada, or osteonecrosis of the head. Then walk through the proposed arthroplasty, step by step.
3
Share

Give the patient the QR code or an image: they find their own case, in their language.

Features

Explain in detail during the visit

Every setting updates the model live: you reproduce the lesions from your patient's imaging in front of them, then walk through the treatment you recommend.

Osteoarthritis, from the radiograph

The “Pathology & lesions” panel offers three types, each with its reference classification. Changing the grade animates the transition: the patient sees the osteoarthritis progress.

Concentric osteoarthritis, grade by grade

From grade I to grade III, the humeral osteophyte grows from under 3 mm to over 7 mm, the glenoid osteophyte follows, the cartilage wears away from the contact zone and the exposed bone turns red. From grade II on, the head loses its sphericity; the joint space narrows along its axis, without migration.

The Samilson-Prieto classification, grade by grade →

Model panel: “Concentric osteoarthritis” type, Samilson gauge at grade II. — **Grade I** · osteophyte < 3 mm

Shoulder seen from the front, as on the radiograph: grade I concentric osteoarthritis, small inferior humeral osteophyte, cartilage barely worn. — **Grade I** · osteophyte < 3 mm

The treatment, step by step

Three arthroplasties, played step by step, continuously or one step at a time. Each step opens on its own view: the camera orbits the shoulder to reach it.

Hemiarthroplasty

Metal stem and head, no glenoid component: the glenoid and its cartilage are preserved. The model flags when the glenoid is involved.

Hemiarthroplasty, step 2: metal head in place, shoulder reduced against the preserved glenoid. — 2Stem, head, reduction

Anatomic total shoulder arthroplasty

Head resection at the anatomic neck, osteophytes removed with a rongeur, polyethylene glenoid component, metal stem and head, reduction.

Anatomic arthroplasty, step 1: head resected, the humeral osteophyte removed with a rongeur. — 1Head resection

Anatomic arthroplasty, step 2: the polyethylene glenoid component seated on the glenoid. — 2Glenoid component

Anatomic arthroplasty, step 3: metal head on its stem, shoulder reduced. — 3Stem, head, reduction

Reverse shoulder arthroplasty

Glenoid lateralized with a bone graft: graft, baseplate and four screws, 36 mm glenosphere, then stem and polyethylene liner; the cup covers the glenosphere.

Reverse arthroplasty, step 1: humeral head resected, shoulder dislocated. — 1Head resection

Reverse arthroplasty, step 2: the bone graft seated on the glenoid, filling its wear. — 2Bone graft

Reverse arthroplasty, step 3: baseplate screwed through the graft, metal glenosphere in place. — 3Baseplate, glenosphere

Reverse arthroplasty, step 4: the humeral cup covers the glenosphere, shoulder reduced. — 4Stem, reduction

How the reverse arthroplasty affects the deltoid

The “See the effect on the deltoid” button morphs the arthritic shoulder into a reverse arthroplasty: the humerus lowers and lateralizes, the deltoid fibers lengthen and turn red. The measurements appear: lowering, lateralization, muscle lengthening.

Model panel: reverse arthroplasty selected, “Fit the reverse prosthesis” and “See the effect on the deltoid” buttons. — **Before** · arthritic shoulder

Shoulder from the front with Hamada grade 5 eccentric osteoarthritis, before reverse arthroplasty: head migrated up under the acromion. — **Before** · arthritic shoulder

After the visit

The patient leaves with their 3D model

They scan the QR code: the model, their findings and the proposed treatment follow them on their phone, in their language.

The model, exactly as you set it

At the end of the visit, the Consultation panel shows the anatomical findings, the proposed treatment and a QR code. The patient scans it and finds the model on their phone exactly as you set it, in their language.

Their lesions, and the proposed treatment to replay step by step.
Their anatomical findings and the explanatory card.
No identifying data in the link.

Patient view on a phone: the shoulder after anatomic arthroplasty, and the “The proposed treatment” panel open, with the “Replay” button. — What the patient sees after scanning the QR code

Every structure explains itself on tap

Tap the humeral head, an osteophyte, the worn cartilage, the implant or the stem: its name and an explanation appear.

One explanation per structure: bones, cartilage, osteophytes, implants.
Written for the patient, in their language.
They can reread it on their own, on the tablet or at home.

Explanation bubble shown after tapping the humeral osteophyte, below the head. — “What is this?” on tap

They can replay the treatment step by step

From “The proposed treatment,” the patient replays the procedure: each step plays at their own pace, with its explanation, as often as they like.

Patient view on a phone: the anatomic arthroplasty replayed step by step. — “Replay”: the procedure, step by step

Try it with your next case: the model opens in your browser, nothing to install.

Customize the lesions

Patient information

Quality information, documented

Only 12% of U.S. adults have proficient health literacy (National Assessment of Adult Literacy). A patient who sees their own lesions and the proposed procedure understands them, gives truly informed consent, and approaches treatment with confidence.

For the patient

They see their own lesions, reproduced from their imaging, and how the proposed treatment unfolds. They leave with the same material and can review it at home, with their family, as often as they like, before giving consent.

For the physician

Each visit created with an account keeps a record of the information provided: what was shown, when, and whether the patient reviewed it. The model image, with the anatomical findings, the proposed treatment and the QR code, downloads for the patient's chart and prints. Informed consent, as the Joint Commission puts it, is more than getting a signature.

Saved and datedThe exact state of the model: injuries shown, treatment proposed.
Identical, archivableThe patient receives what you showed; the image goes in the chart and prints.
TrackedEach time the patient opens the link is recorded.
AnonymousThe link given to the patient carries no identifying data.

“Document the informed consent conversation and the patient’s (or surrogate’s) decision in the medical record in some manner.”

AMA Code of Medical Ethics, Opinion 2.1.1, Informed Consent

The model supports the consent conversation and the written consent form; it does not replace them. Data and privacy: legal information (in French).

Questions

Questions from colleagues

Is the model free?

Partly: the model and the types of osteoarthritis are free. Treatments (hemiarthroplasty, anatomic and reverse arthroplasty, the effect on the deltoid) and other features are paid options.

Do I need an account?

Not to open the model, set the lesions and walk through the treatment. After about fifteen adjustments, you will be asked to create a free account: it saves your visits, picks them up from one time to the next, and records when the patient opens the link.

What equipment do I need?

Just a web browser, nothing to install: computer, tablet or TV screen in the exam room; the patient opens it on their phone. One click saves an image, without the interface, for the chart.

What happens to patient data?

No patient names are stored. The link given to the patient carries only the state of the model: lesions, treatment, language and visit date. A name written on the image you hand out stays on that image.

Is it a medical device?

No: it is an educational tool. It does not diagnose, does not plan surgery, and does not replace the consent conversation or the written consent form. Among software functions that are not medical devices, the FDA lists those intended for general patient education and interactive anatomy diagrams used for training.

How long does it take in clinic?

Three adjustments and one procedure played: a few minutes, during the visit. The patient reviews it at home, as often as they like.

Which classifications?

Samilson and Prieto (grades I to III) for concentric osteoarthritis, Hamada as modified by Walch (grades 1, 2, 3, 4A, 4B and 5) for eccentric osteoarthritis; osteonecrosis of the humeral head has its own appearance. With “Landmarks & labels,” the humeral osteophyte shows its size class.

Does the model choose the implant?

No: you choose. The model only flags debatable combinations on the step card (hemiarthroplasty with a worn glenoid, anatomic arthroplasty with a torn cuff), and never blocks a choice.

Can I embed it on my website?

It is planned for upcoming plans: the model displayed on a practice or hospital website, credited to EMET Education.

Which languages?

English, Spanish, French and Russian. The patient receives the model in the language chosen during the visit, which helps with the roughly 28 million people in the U.S. with limited English proficiency, alongside a qualified interpreter, not instead of one.

Design

Who designed this model

Model designed by Dr. Mikaël Chelli, orthopedic surgeon, based on the reference classifications. Updated October 2, 2026.

Neer C.S. II. Replacement arthroplasty for glenohumeral osteoarthritis. J Bone Joint Surg Am, 1974.
Samilson R.L., Prieto V. Dislocation arthropathy of the shoulder. J Bone Joint Surg Am, 1983.
Hamada K. et al. Roentgenographic findings in massive rotator cuff tears. A long-term observation. Clin Orthop Relat Res, 1990.
Cruess R.L. Steroid-induced avascular necrosis of the head of the humerus. J Bone Joint Surg Br, 1976.
Grammont P.M., Baulot E. Delta shoulder prosthesis for rotator cuff rupture. Orthopedics, 1993.
Boileau P. et al. Bony increased-offset reversed shoulder arthroplasty: minimizing scapular impingement while maximizing glenoid fixation. Clin Orthop Relat Res, 2011.

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