Abstract
In a study involving 34 patients, researchers looked at how knee extension lag correlated with other measures of injured and healthy limbs. The average flexion force was found to be greater than the average extension force in the injured extremity, and there was no difference between the means of flexion and extension force. This study also found that the extension lag was unrelated to squatting depth, extension force, flexion force, circumference at the joint line, circumference 5 and 15 centimeters cephalad to the patella pole, and active or passive knee flexion. When compared to a control group of patients with healthy rotational movements, these medians showed significant variation. Comparisons between patient groups suggest a connection between quadriceps weakness and knee extension lag, but no other factors have been found to correlate with this finding. Researchers recommend recruiting participants with extension lags greater than 30 in order to increase the likelihood of discovering such links.
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