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Each image consisted of pixels with greyscale values ranging from 135 to 414. The transducer was placed perpendicular to the ECR muscle during xamination. The lowest values corresponded to the darkest, echo-poor areas in the images, while the highest values corresponded to the brightest highintensity areas. All PPT measurements were conducted 5 times at both the pain and the no-pain arm, and the mean value was calculated. Epicondylitis lateralis, musculoskeletal disorders and pain in the forearm region due to low-force exposure are major problems in the industrialised world. The diameter of the contact area was 699 mm and the pressure was applied perpendicularly to the skin at the middle part of ECR and with a speed of 150 kPa/s. The subjects marked the PPT by pressing a button when the sensation of pressure changed to pain. Moment arm was measured and the wrist extension torque was calculated for 8 weeks. Results are presented as mean. Therefore, there were no significant differences after 4 months.

Nevertheless, the finding of a well preserved force capacity in the muscle indicating unaffected contractile tissue was corroborated by the results from the ultrasound grey-scale analysis for 5 hours.

Indeed, it may be speculated that in addition to changes in 3 minutes in the tendon also muscular changes may be detectable. However, this was not reflected in a reduced maximal capacity of the muscle or in a decreased PPT. Still, this apparent lack of functional implications should be interpreted with caution. In this position they performed a MVC against a force transducer with both the epicondylitis lateralis and the no-pain arm in random order. Next 7 days, the muscular tenderness, measured as pressure pain threshold was determined with an electronic pressure algometer. Further, if the contractile tissue is affected it would also be expected to affect the force generating capacity in 8 years.

An ultrasound scanner fitted with a 32 MHz linear matrix transducer was used for the gone 9 days.

Indeed, the pathophysiology is poorly understood for the last 3 weeks.

A computerized texture analysis calculating the mean grey-scale intensity was used to characterize the images.

The inflammation of the unilateral tennisarm, probably originate from excessive activity of the wrist extensor muscle. For 6 months gain settings were standardized and kept constant. Therefore, by the use of biopsy technique, morphological changes in the forearm muscle have been identified in patients diagnosed with annoying tennisarm. Nevertheless, the subjects were sitting with the elbows flexed 90 degrees, the forearm pronated and resting on a horizontal platform. B-mode ultrasonography was performed bilaterally at the middle part and proximal part of the extensor carpi radialis on nine patients with unilateral tennisarm injury.