Vague pain in the proximal and volar surface of the forearm that generally increases with activity.
The symptoms are often vague, with a fatigue-like pain.
Repetitive, strenuous motions such as weight training and repetitive pro-supination movements often provoke the symptoms.
There may be some reduced sensibility and/or paraesthesia in the radial three and a half digits of the hand.
Signs
On inspection, an indentation of the pronator muscle mass below the
medial epicondyle may suggest a constriction of the lacertus fibrosus.
This indentation may be more pronounced during a resisted pronation of the forearm.
A resisted pronation during thirty seconds may provoke the symptoms.
Also direct local pressure on the pronator teres during resisted pronation may provoke the symptoms.
The pressure is by the examiner's thumb, about 4 cm distal to the antebrachial crease.
If the compression is at the arch of the flexor digitorum muscle, the symptoms are believed to be aggravated by a resisted flexion of the middle finger
Tinel's sign: percussion on the area of the pronator teres muscle may provoke paraesthesia in the 3 1/2 radial fingers.
A deficit of the flexor pollicis longus and the flexor digitorum profundus of the index finger cause a typical pinch attitude (right hand on the picture) the distal interphalangeal joints stay in extension during the pinch
