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Optical tension experiments for model statistics were conducted for more elucidation of lifting osteotomy of tibial tuberosity and mechanisms of its impact upon the femoropatellar joint. The following two qualitative conclusions were primarily drawn: Growing pre-displacement caused reduction in the maximum number of isochromates. Stepwise pre-displacement caused dislocation of the contact point. While full translation of the above results to natural conditions is considered impermissible, displacement of femoropatellar pressures is felt to be an important mechanism of action.

Methodical aspects of designing and evaluation of epidemiological studies in occupational health research concerning chronical damages were discussed and illustrated by a study, which shows an essential dependence of arthrotical changes in the knee-joint from age and the intensity of kneeling stress. It is important for both design and evaluation, to regard relevantly the period of exposure. Dose-response relations can be simple proved and well described by regression analysis. Methods like score regression and cumulative logistic regression are very suitable for medical findings with rank categorial levels.