Scapular strengthening is thought to be an important component of the rehabilitation of patients with internal impingement.
To determine the effect of scapular-retractor-muscle fatigue on internal- and external-rotation-torque production in patients with internal impingement.
Case control study.
15 patients and 18 healthy subjects.
A scapular-retractor-fatigue protocol.
Main Outcome Measure:
Shoulder-rotation- torque production.
After the scapular-retractor-fatigue protocol external- rotation strength was reduced in patients (involved 25%, noninvolved 19%; P < .001).
Fatigue in the scapular retractors resulted in lower shoulder-rotation-torque production. These findings emphasize the importance of the scapular retractors for proper function of the shoulder rotators with the arm in an abducted position in patients with internal impingement.