Article

Articular surfaces reconstruction is essential in total shoulder
arthroplasty. Because of the limited glenoid bone support, thin glenoid component
could improve anatomical reconstruction, but adverse mechanical effects might
appear. METHODS: With a numerical musculoskeletal shoulder model, we analysed and
compared three values of thickness of a typical all-polyethylene glenoid
component: 2, 4 (reference) and 6mm. A loaded movement of abduction in the
scapular plane was simulated. We evaluated the humeral head translation, the
muscle moment arms, the joint force, the articular contact pattern, and the
polyethylene and cement stress. Findings Decreasing polyethylene thickness from 6
to 2mm slightly increased humeral head translation and muscle moment arms. This
induced a small decreased of the joint reaction force, but important increase of
stress within the polyethylene and the cement mantel. Interpretation The
reference thickness of 4mm seems a good compromise to avoid stress concentration
and joint stuffing.
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Langue : ANGLAIS