A functional posterior cruciate ligament (PCL) is important for the knee stability after PCL-retaining total knee arthroplasty (TKA). The objectives of this study were to determine the anteroposterior (AP) displacement of the knee after a mobile- or fixed-bearing PCL-retaining TKA operated with a ligament-balancing technique and the correlation of AP stability with the clinical outcome.
The AP displacement of 160 TKAs in 143 patients was measured pre- and intra-operatively, and the results were compared to the AP displacement measured 4 years post-surgery.
The change in AP displacement from intra-operative measurement to follow-up at the 25° measuring point was −1.2 mm; at 90°, it was −0.2 mm. Mobile bearings showed significantly greater AP displacement than fixed bearings. Older patients, male patients and patients receiving a fixed prosthesis had lower post-operative laxity compared with the overall population.
The small change in AP displacement indicates that the PCL remains functional over time. In our study, we could not find any correlation between knee AP stability and clinical outcome, including passive flexion, Knee Society Score or Visual Analogue Scale of pain and satisfaction.
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We thank Dr. B. Christen, Salemspital, Berne who referred patients to this study and Dr. U. Wehrli, Spital Netz Bern Ziegler who performed most of the surgeries.
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Schuster, A.J., von Roll, A.L., Pfluger, D. et al. Anteroposterior stability after posterior cruciate-retaining total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 19, 1113–1120 (2011). https://doi.org/10.1007/s00167-010-1364-1
- Ligament tensor