PURPOSE: After an anterior cruciate ligament injury and subsequent reconstruction, quadriceps muscle weakness and disruption of proprioceptive function are common. The purpose of this study was to examine the effects of a 4 weeks preoperative exercise intervention on knee strength power and function post-surgery. SUBJECTS AND METHODS: Eighty male patients (27.8 +/- 5.7 age), scheduled for reconstruction surgery, were randomly assigned to two groups, the preoperative exercise group (n = 40) and a no preoperative exercise group (n = 40). The preoperative exercise group participated in a 4-week preoperative and 12-week post-operative programs, while the no preoperative exercise group participated only in the 12-week postoperative exercise program. Isokinetic measured of quadriceps strength were obtained at 4 weeks before and 3 months after surgery. RESULTS: The knee extensor strength deficits measured at 60 degree/s and 180 degree/s was significantly lower in the preoperative exercise group compared with the no preoperative exercise group. At 3 months after surgery, the extensor strength deficit was 28.5 +/- 9.0% at 60 degree/sec and 23.3 +/- 9.0% at 180 degree/sec in the preoperative exercise group, whereas the no preoperative exercise group showed extensor strength deficits of 36.5 +/- 10.7% and 27.9 +/- 12.6% at 60 degree/sec and 180 degree/sec, respectively. The preoperative exercise group demonstrated significant improvement the single-leg hop distance. CONCLUSION: Four week preoperative exercise may produce many positive effects post reconstruction surgery, including faster recovery of knee extensor strength and function, as measured by single-leg hop ability.

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