Sagittal laxity in vivo after total knee arthroplasty |
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Authors: | Email author" target="_blank">Yoshinori?IshiiEmail author Yoshikazu?Matsuda Ryo?Ishii Shigeo?Sakata Go?Omori |
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Institution: | (1) Ishii Orthopaedic and Rehabilitation Clinic, 1089 Shimo-Oshi, 361-0037 Gyoda, Saitama, Japan;(2) Department of Orthopaedic Surgery, Sado General Hospital, 952-1209 Sado, Niigata, Japan;(3) Department of Orthopaedic Surgery, Niigata University, 1 Asahimachi, 951-8510 Niigata, Japan |
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Abstract: | Introduction A stress arthrometry study of 77 knees undergoing total knee arthroplasty was performed to determine the difference in anteroposterior (AP) laxity between posterior cruciate ligament (PCL)-retaining (PCLR) and PCL-substituting (PCLS) prostheses using the Genesis I TKA.Materials and methods Fifty-three knees had PCLR and 24 had PCLS prostheses. The selected patients had successful arthroplasties after a minimum follow-up of 5 years. AP laxity was measured with a KT-2000 arthrometer (Medmetric, San Diego, CA, USA) using standard protocols.Results At 30° of flexion, there was no statistical difference in anterior (PCLR: 4.7 mm, PCLS: 4.5 mm), posterior (PCLR: 1.1 mm, PCLS: 0.7 mm), or total (PCLR: 5.8 mm, PCLS: 5.3 mm) displacement. At 75°, significant differences were seen in both anterior (PCLR: 3.3 mm, PCLS: 2.3 mm) and total (PCLR: 4.8 mm, PCLS: 3.4 mm) displacement (p=0.001 and p=0.009, respectively), although there was no statistical difference in posterior displacement (PCLR: 1.5 mm, PCLS: 1.1 mm).Conclusion The above values are considered the suitable degree of AP laxity in total knee arthroplasty for a satisfactory clinical outcome 5–9 years after surgery. The PCL in a PCLR prosthesis and the central tibial spine and femoral cam in a PCLS prosthesis might play comparable roles in determining the laxity in the posterior direction in these prostheses. |
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Keywords: | Genesis I total knee arthroplasty Posterior cruciate ligament retaining Posterior cruciate ligament substituting Sagittal laxity KT-2000 arthrometer |
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