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- Many of the wrist flexors and extensors cross both the elbow and the wrist joint.
- By conducting the test with the elbow straight AND then with the elbow in 900 of flexion useful information about which muscles are involved can be gained.
- For example if the wrist extension is restricted when the elbow is in extension but not when it is in flexion, then possibly one of the wrist flexors that cross the elbow joint is short.
- It does not matter so much whether the arm is in medial rotation and the foream in pronation or the other way round as long as the test is performed under the same conditions on both sides.