Scapular dyskinesia due to repetitive overhead movements is among the common problems of the tennis playing shoulder. The resulting ante-tilting of the glenoid together with the anteroinferior laxity and posterior tightness of the capsule causes a shift of the center of rotation of the shoulder. Abduction-external rotation movements will induce a posterosuperior shift of the humeral head resulting in a posterior SLAP lesion, possibly progressing to an articular side rotator cuff tear which can evolve to a full thickness tear. It is important to identify the `shoulder at risk` to prevent the development of this pathological cascade. This demands awareness of this phenomenon by coaches, physiotherapists and sports physicians. Efficient rehabilitation can prevent progression of damage to the shoulder joint and so, avoid surgery.
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