Fifty-nine people, 31 healthy subjects with no previous knee injuries and 28 who had undergone an intra-articular anterior cruciate ligament reconstruction 6-12 months prior to testing took part in the study. The subjects were randomly tested bilaterally on a Cybex 6000 isokinetic testing device (ITD) and on an ordinary leg extension bench (LEB). Strength and endurance were tested with both methods. The linear relationships for paired strength and endurance differences between ITD and LEB were found to be acceptable for the operated group. The LEB alone explained 57% and 38% of the ITD outcome for strength and endurance, respectively. The agreement between observed and predicted ITD values based on the LEB measurements was found satisfactory with a positive standardized agreement index. This indicates that the LEB can be used as a helpful tool in evaluation of quadriceps muscle strength deficits.
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