KMID : 0359620150270030156
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Journal of Korean Knee Society 2015 Volume.27 No. 3 p.156 ~ p.162
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High-Flexion Total Knee Arthroplasty Using NexGen LPS-Flex System: Minimum 5-year Follow-up Results
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Rhee Seung-Joon
Hong Sung-Min Suh Jeung-Tak
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Abstract
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Purpose: This study is to report clinical and radiological results of high-flexion total knee arthroplasty (TKA) using NexGen LPS-flex system at a minimum 5-year follow-up, and to analyze the implant survivorship based on the results.
Materials and Methods: A total of 80 patients (118 knees) who underwent patellar preserving TKA using NexGen LPS-flex implant between February 2007 and February 2008 and could be followed for minimum 5 years were reviewed. The range of motion (ROM), hip-knee-ankle angle, Knee Society Knee score (KSKS), and Knee Society Function score (KSFS) were assessed preoperatively and at the last follow-up and analyzed. Implant position of the femoral and tibial components on the immediate postoperative and last follow-up X-rays were compared.
Results: The mean ROM was 110.2¡Æ¡¾14.5¡Æ (range, 60¡Æ to 140¡Æ) preoperatively and 132.4¡Æ¡¾5.2¡Æ (range, 90¡Æ to 145¡Æ) at the last follow-up. KSKS was 36.9¡Æ¡¾6.4¡Æ preoperatively and 94.2¡Æ¡¾3.2¡Æ at the last follow-up. KSFS was 30.5¡Æ¡¾5.7¡Æ preoperatively and 93.7¡Æ¡¾4.1¡Æ at the last follow-up. There was no statistically significant change in the implant position measured as ¥á, ¥â, ¥ã, and ¥ä angles at the last follow-up compared to the immediate postoperative values. Radiolucent lines were observed in 13 knees (11%) on the last follow-up X-rays. Revision TKA was performed due to aseptic implant loosening in 1 knee (0.84%), and the survival rate at the 5th postoperative year was 99.2%.
Conclusions: The clinical and radiological outcomes of high-flexion TKA using NexGen LPS-Flex implant design were satisfactory with 99.2% implant survival rate after 5 years of protected activities of daily living.
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KEYWORD
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Knee, Arthroplasty, Prosthesis design, Survival analylsis
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