The torque curve is usually flattened during the concentric phase of either internal or external rotation (dependent on the position of the humorous).

If the test is performed in 90 degrees of abduction (lying position) then the curve will be flattened in the latter half of internal rotation see next figure.

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This is because the anterior structures are most vulnerable to impingement in this position (in isokinetic terms that is).

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The curves are similar to that seen in shoulder impingement but the peak torque is usually much lower.

Graph shown for abduction concentrically.

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The torque curve is similar to that seen in shoulder impingement, however, a normal curve is usually seen in early repetitions with changes only evident in later repetitions.

This is probably due to a gradual build up of pain during the test.

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The curves seen will be erratic with a low coefficient of variance. These results are entirely due to pain.

Graph shown for flexion concentrically.

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