The Effect of Knee Component Design Changes on Range of Motion: Evaluation In Vivo by a Computerized Navigation System

Although acceptable for most patients, the range of motion obtained by traditional knee replacements may not be enough for certain patient populations. Modified knee designs have been introduced with the aim of increasing knee range of motion. Using a computerized navigation system, the effect of a modified total knee design on knee range of motion was evaluated in 30 knees. The Non-Restrictive Geometry knee system was found to provide a significant increase in mean flexion and overall range of motion of the knee compared with the Scorpio Flex knee system (P = .02). This confirms that changes in knee component design may result in improved range of motion.