"Differential diagnosis "
"Typically, patients fail to make an “OK sign", as flexion of the interphalangeal joint of the thumb and the distal interphalangeal joint of the index finger is impaired. Another sensitive yet similar test is the "pinch test" whereby a patient with anterior interosseous nerve syndrome will not be able to pinch a sheet of paper between their thumb and index finger, but will instead of clamp the sheet between their extended thumb and index fingers. Weakness of the pronator quadratus muscle manifests itself in pronation weakness with a flexed elbow 2."
Expected headings
"Distribution"
"Differential diagnosis "
"Anterior interosseous nerve syndrome is a pure motor neuropathy, as the anterior interosseous nerve contains no sensory fibres; dull forearm pain is however sometimes mentioned by patients."
"Look for the pattern of muscle signal changes on fluid-sensitive (STIR, PD or T2 fat sat) sequences to uncover the affected nerve."
"History and etymology"