05/28/2002 By David Ball
Patients who have unilateral total knee arthroplasty using the subvastus approach show
faster functional recovery than those who undergo surgery by the parapatellar approach.
There appears to be a phenomenon of cross adaptation of the untreated knee to the
surgically treated knee, say researchers at Far Eastern Memorial Hospital, and National Taiwan University and Hospital, Taipei, Taiwan. Muscle torques in 12 female subjects who had unilateral total knee arthroplasty by the subvastus approach from January 1997 to June 1998 were compared with an historic control group of 16 female patients whose surgery used the parapatellar approach.
A Cybex dynamometer was used to measure isometric and isokinetic muscle strength at six and 12 months after surgery. Each of the two approaches was compared against two parameters.
The first was the difference in peak torque between the baseline value for the healthy knee and the surgically treated knee. The second was the hamstring to quadriceps peak-torque ratio, again using the value for the healthy knee as baseline.
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