Key result
Peak strain on the glenoid side of the antero-inferior capsule was significantly greater than the humeral side during subluxation in a biomechanical model.
This study reports an accurate method for measuring planar strains in a three-dimensional membrane, demonstrating that peak strain on the glenoid side of the AIC is significantly greater than the humeral side during subluxation.
Warrants caution assuming uniform capsular strain in subluxation; leaves open whether glenoid-side focus improves human instability outcomes.
The antero-inferior capsule (AIC) is the primary restraint to antero-inferior glenohumeral dislocation. This study utilizes a biomechanical model to determine the total strain field of the AIC in a subluxed shoulder. Strains were calculated from two capsule states: a nominal strain state set by inflation and a strained state set by subluxation. Marker coordinates on the AIC were reconstructed from stereoradiographs and strain fields calculated. Peak strain on the glenoid side of the AIC was significantly greater than the humeral side and strain fields were highly variable. This study reports an accurate method for measuring planar strains in a three-dimensional membrane.
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Malicky et al. (2001) studied Antero-inferior glenohumeral dislocation. Subluxation vs. Nominal strain state set by inflation was evaluated on Total strain field of the antero-inferior capsule. Peak strain on the glenoid side of the antero-inferior capsule was significantly greater than the humeral side during subluxation in a biomechanical model.
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