Abstract
The hypothesis that limiting the knee-flexion range increases the peak hip-extension moment while transferring from sitting to standing was tested by filming (100 fps) ten normal human volunteers. With the knees flexed 105° from full extension (0°) the mean (± 1 S.D.) peak hip-extension moment was 142 (± 37) Nm. With the knees flexed only 75° subjects threw their arms and trunks forward to a greater extent, with a peak moment of 253 (± 65) Nm ( p < 0.0001). If the peak moments rise to a similar degree in patients with arthritis and limited knee-flexion range, they may accelerate hip joint damage or the loosening of hip endoprostheses.
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