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.
Total Strain Fields of the Antero-Inferior Shoulder Capsule Under Subluxation: A Stereoradiogrammetric Study
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division October 21, 1999; revised manuscript received April 17, 2001. Associate Editor: K.-N. An.
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Malicky, D. M., Soslowsky, L. J., Kuhn, J. E., Bey, M. J., Mouro, C. M., Raz, J. A., and Liu, C. A. (April 17, 2001). "Total Strain Fields of the Antero-Inferior Shoulder Capsule Under Subluxation: A Stereoradiogrammetric Study ." ASME. J Biomech Eng. October 2001; 123(5): 425–431. https://doi.org/10.1115/1.1394197
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