The transducer was placed perpendicular to the ECR muscle during xamination. Nevertheless, 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. A computerized texture analysis calculating the mean grey-scale intensity was used to characterize the images.
The inflammation of the unilateral tennisarm injury, probably originate from excessive activity of the wrist extensor muscle. For 7 minutes gain settings were standardized and kept constant. Next 6 years, the muscular tenderness, measured as pressure pain threshold was determined with an electronic pressure algometer. Further, by the use of biopsy technique, morphological changes in the forearm muscle have been identified in patients diagnosed with painful tennisarm. Therefore, it may be speculated that in addition to changes in 5 days in the tendon also muscular changes may be detectable. Indeed, the pathophysiology is poorly understood for the gone 4 weeks.
Each image consisted of pixels with greyscale values ranging from 921 to 857. Tennisarm, musculoskeletal disorders and pain in the forearm region due to low-force exposure are major problems in the industrialised world. An ultrasound scanner fitted with a 40 MHz linear matrix transducer was used for the first 6 hours.
Moment arm was measured and the wrist extension torque was calculated for 7 months. Results are presented as mean. However, there were no significant differences after 4 years.
The diameter of the contact area was 562 mm and the pressure was applied perpendicularly to the skin at the middle part of ECR and with a speed of 636 kPa/s. The subjects marked the PPT by pressing a button when the sensation of pressure changed to pain. However, if the contractile tissue is affected it would also be expected to affect the force generating capacity in 5 minutes.
Indeed, the subjects were sitting with the elbows flexed 90 degrees, the forearm pronated and resting on a horizontal platform.
Translated in Ducth it says: Woon je in Woensdrecht of Deventer en heb je annoying tennisarm’ snel verhelpen van tennisarm is nog nooit zo gemakkelijk geweest. Kijk nu op verhelpen van tennisarm, want van Terneuzen tot Emmen, epicondylitis lateralis verhelpen kan hier altijd.
Further, 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 6 months. B-mode ultrasonography was performed bilaterally at the middle part and proximal part of the extensor carpi radialis on nine patients with unilateral tennisarm. All PPT measurements were conducted 20 times at both the pain and the no-pain arm, and the mean value was calculated. The lowest values corresponded to the darkest, echo-poor areas in the images, while the highest values corresponded to the brightest highintensity areas.