Background: Articular cartilage contributes to transferring enormous loads as uniformly as possible from one skeletal segment to the next. Whether it manages this task when subjected to the high repetitive loading cycles occurring during long-distance running and can remain intact is still the topic of controversy. Purpose: To investigate the changes in cartilaginous volumes of the tibia, patella, medial and lateral menisci after extreme dynamic loading (as occurs in long-distance runners) and after one hour of rest. Methods: The knees of 30 male healthy athletes (38 +/- 14 years) were studied. The subjects ran around a predetermined and precisely measured course (5, 10, 20 km), the beginning and end of the run being in the magnetic resonance imaging investigation room. The scan protocol was 60-minute rest period, first measurement, run, second measurement, one hour of rest, third measurement. Results: Overall, there were significant reductions in volume for the patella, tibia, and menisci after the run There was no significant influence of the lenght of run (5, 10 or 20 km) on the measured deformation. After one hour of rest there was a signifcant increase of volume in cartilage and menisci. Conclusion: The volume reduction after dynamic loading is due to a loss of interstitial fluid. This mechanism prevents the cartilage from damage by creating a hydrostatic pressure. On the basis of the results of this study, the authors assume that the cartilage is able to adapt well to the loads caused by running.
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Background: Articular cartilage contributes to transferring enormous loads as uniformly as possible from one skeletal segment to the next. Whether it manages this task when subjected to the high repetitive loading cycles occurring during long-distance running and can remain intact is still the topic of controversy. Purpose: To investigate the changes in cartilaginous volumes of the tibia, patella, medial and lateral menisci after extreme dynamic loading (as occurs in long-distance runners) and a...
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