Results of cruciate retaining total knee arthroplasty

PURPOSE OF REVIEW: The aim of this article is to review recent publications regarding the results of posterior cruciate ligament retaining total knee arthroplasty, the most commonly implanted type of knee replacement used worldwide. Recent developments in understanding of the kinematics of these implants are discussed together with clinical follow-up studies. RECENT FINDINGS: The cruciate retaining total knee arthroplasty is a successful implant design and can be safely used in patients with rheumatoid arthristis. Infection, aseptic loosening or wear of the insert continue to be the main modes of failure of cruciate retaining total knee arthroplasty. All polyethylene and metal-backed tibias have similar outcome at 10 years. Presence of a ipsilateral planovalgus foot can increase the risk of failure of cruciate retaining total knee arthroplasty. Mobile bearing knees tend to have low-grade wear whereas high-grade wear is more common in the fixed bearing designs. High-flex designs might improve tibiofemoral contact biomechanics if high flexion is achievable, although their clinical advantages are still unproven. SUMMARY: Fixed bearing cruciate retaining total knee arthroplasty have a good track record. Advances are being made in the field of implant design although as yet no obvious clinical advantages have been proven. © 2008 Lippincott Williams and Wilkins, Inc