⭕ Glenoid Bone Loss & Glenoid Track (On / Off-Track)
UseShoulder imaging: true AP, Y view and 3D CT — rotator cuff disease and instability reporting and procedure se…
SourceYamamoto N, et al. Contact between the glenoid and the humeral head in abduction, external rotation…
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
Methodology · worked example, guidelines & full notes
3D CT en-face view of the glenoid with the humeral head subtracted (or oblique sagittal).
When to use
Shoulder imaging: true AP, Y view and 3D CT — rotator cuff disease and instability reporting and procedure selection.
How it works
Glenoid bone loss < 13.5%: minor Glenoid bone loss 13.5–20%: subcritical (higher failure of isolated Bankart) Glenoid bone loss ≥ 20%: critical — consider bone block (eg, Latarjet; some use 25%)
Key points
- 3D CT en-face view of the glenoid with the humeral head subtracted (or oblique sagittal).
- Each value is graded against published reference ranges.
- Measurement technique and positioning change the numbers — compare like with like on follow-up.
- Part of the YuanDoctor MSK measurement topic.
References
- Yamamoto N, et al. Contact between the glenoid and the humeral head in abduction, external rotation, and horizontal extension: a new concept of glenoid track. J Shoulder Elbow Surg 2007;16:649-656
- Di Giacomo G, Itoi E, Burkhart SS. Evolving concept of bipolar bone loss and the Hill-Sachs lesion: from engaging/non-engaging lesion to on-track/off-track lesion. Arthroscopy 2014;30:90-98
- Shaha JS, et al. Redefining critical bone loss in shoulder instability. Am J Sports Med 2015;43:1719-1725
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Best-fit circle diameter D | 26 mm |
|---|---|
| Anterior defect width d | 4 mm |
| Hill-Sachs interval HSI (optional) | 15 mm |
→Glenoid bone loss15.4%
- Glenoid bone loss：15.4 % → 13.5–20%: subcritical (higher failure of isolated Bankart)
- Glenoid track：0.83 × 26 − 4 = 17.6 mm
- Track status：On-track (HSI 15 ≤ 17.6 mm)
Verification & sources · governance
FAQ
Frequently asked questions
- What are the limits and cautions when using Glenoid Bone Loss & Glenoid Track (On / Off-Track)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- Does Glenoid Bone Loss & Glenoid Track (On / Off-Track) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Glenoid Bone Loss & Glenoid Track (On / Off-Track) calculated in practice? Can you show a worked example?
- Inputs: Best-fit circle diameter D 26 mm, Anterior defect width d 4 mm, Hill-Sachs interval HSI (optional) 15 mm → Result: Glenoid bone loss 15.4 %（Glenoid bone loss: 15.4 % → 13.5–20%: subcritical (higher failure of isolated Bankart), Glenoid track: 0.83 × 26 − 4 = 17.6 mm, Track status: On-track (HSI 15 ≤ 17.6 mm)）