Why don't most runners get knee osteoarthritis? A case for per-unit-distance loads.

RH Miller, WB Edwards, SC Brandon… - Medicine and science …, 2014 - europepmc.org
Medicine and science in sports and exercise, 2014europepmc.org
Purpose This study aimed to compare peak and PUD knee joint loads between human
walking and running. Methods Fourteen healthy adults walked and ran at self-selected
speeds. Ground reaction force and motion capture data were measured and combined with
inverse dynamics and musculoskeletal modeling to estimate the peak knee joint loads, PUD
knee joint loads, and the impulse of the knee joint contact force for each gait with a matched-
pair (within-subject) design. Results The peak load was three times higher in running (8.02 …
Purpose
This study aimed to compare peak and PUD knee joint loads between human walking and running.
Methods
Fourteen healthy adults walked and ran at self-selected speeds. Ground reaction force and motion capture data were measured and combined with inverse dynamics and musculoskeletal modeling to estimate the peak knee joint loads, PUD knee joint loads, and the impulse of the knee joint contact force for each gait with a matched-pair (within-subject) design.
Results
The peak load was three times higher in running (8.02 vs 2.72 body weight, P< 0.001), but the PUD load did not differ between running and walking (0.80 vs 0.75 body weight per meter, P= 0.098). The impulse of the joint contact force was greater for running than for walking (1.30 vs 1.04 body weight per second, P< 0.001). The peak load increased with increasing running speed, whereas the PUD load decreased with increasing speed.
Conclusions
Compared with walking, the relatively short duration of ground contact and relatively long length of strides in running seem to blunt the effect of high peak joint loads, such that the PUD loads are no higher than that in walking. Waveform features other than or in addition to the peak value should be considered when studying joint loading and injuries.
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