Dynamic compression and appearance of the nerve at intersection with the supinator edge related to the final results. Comparison of the extensor carpi radialis brevis muscle, the superficial supinator muscle and the nerve in the entrapment and autopsy series., Comparison of pain characteristics and previous therapy in the entrapment and lateral epicondyl itis series. Comparison with published series. Age and sex distribution in the entrapment series. Selection of the lateral epicondylitis series. Schematic drawing of the operative field and method of decompression. Entrapment site and line of incision. Subcutaneous fat placed over the decompressed nerve to prevent scar formation. Relation between the extensor carpi radialis brevis muscle and the nerve. Relation between the superficial supinator muscle and the nerve. Dynamic compression of the nerve by the supinator edge. Indentation of the nerve under the divided supinator edge. Indentation of the nerve under the divided supinator edge. Clinical signs before and after decompression of the posterior interosseous nerve. Results of decompression in relation to clinical signs. Effect of decompression-on grip strength. Effect of decompression on grip strength in patients operated on the dominant side only. Results of decompression in relation to clinical signs and anatomy. Nerve al teration of the posterior interosseous nerve observed at autopsy. Microscopic appearance of the nerve alteration from figure 16. Enlargement of the upper right section of figure 17. Comparison of work in the entrapment and lateral epicondylitis series. (All figures have been arranged to show the same orientation, i.e. some have been reversed).

The normal grip strength was determined with the Martin Vigorimeter in 450 men and women aged 21--65 years. The grip strength decreased steadily with increasing age. Men were stronger than women and in both sexes the dominant hand was the strongest. The ratio dominant/non-dominant hand varied only slightly with age and sex and it could thus be a useful parameter in evaluation of grip strength under pathological conditions.

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In 16 patients, where the diagnosis carpal tunnel syndrome was electrophysiologically confirmed, the pressure between the median nerve and the carpal ligament was measured peroperatively. At rest the pressure was 18-64 mmHg, mean 31 mmHg. Passive volar and dorsal wrist flexion increased the pressure about three times. Isometric or isotonic maximal contractions of wrist and finger muscles, elicited by tetanic nerve stimulation increased the pressure to three to six times the resting value. These high pressures may be one of the causes of the nerve lesion in the carpal tunnel syndrome.

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