Abstract
A retrospective survey of knee arthroplasties has shown signs of persistent soft-tissue imbalance and has led to the development of specific instrumentation to measure soft-tissue balance during knee replacement. This instrumentation has been used to develop a sequential method of soft-tissue balancing during such surgery. Further analysis of mechanical failures amongst the total knee replacement components has shown them to be statistically associated with persistent soft-tissue imbalance as well as with other factors such as age, weight, activity and the severity of pre-operative deformity. Correction of soft-tissue imbalance at the time of knee arthroplasty is critical if proper limb alignment is to be achieved. Care in achieving both balance and proper alignment should minimize the potential for long-term component failure. The effective correction of imbalance cannot be achieved without properly designed instruments which apply equal tension to the soft tissues to be measured while at the same time registering the relative lengths of the distracted soft tissues.
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