Citation, DOI, disclosures and article data
Citation:
Knipe H, Scapula method. Reference article, Radiopaedia.org (Accessed on 24 Apr 2024) https://doi.org/10.53347/rID-92928
The scapula method is used to assess posterior humeral head subluxation in patients with glenohumeral osteoarthritis as part of the work-up for shoulder arthroplasty.
Method
First, the scapular axis (medial border of the scapular body to center of the glenoid) is drawn on an axial image that is one slice below the tip of the coracoid process.
Then the distance of the entire humeral head (D) is measured then the distance of the humeral head posterior to the scapular axis (A) is measured and a subluxation ratio (A/D) is calculated. Osteophytes should not be included 1.
Interpretation
- subluxation ratio >55% is defined as posterior subluxation
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1. Kidder J, Rouleau D, Pons-Villanueva J, Dynamidis S, DeFranco M, Walch G. Humeral Head Posterior Subluxation on CT Scan: Validation and Comparison of 2 Methods of Measurement. Techniques in Shoulder & Elbow Surgery. 2010;11(3):72-76. doi:10.1097/bte.0b013e3181e5d742
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2. Ricchetti E, Khazzam M, Denard P et al. Reliability of the Modified Walch Classification for Advanced Glenohumeral Osteoarthritis Using 3-Dimensional Computed Tomography Analysis: A Study of the ASES B2 Glenoid Multicenter Research Group. J Shoulder Elbow Surg. 2021;30(4):736-746. doi:10.1016/j.jse.2020.07.013
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