Leelasestaporn Chumroonkiet, Sirithanapipat Premstien, Narinsorasak Thana, Sithitool Kriskamol
J Med Assoc Thai. 2016 Aug;99(8):919-25.
The Low Contact Stress (LCS) rotating platform mobile-bearing knee replacement is a leading, worldwide, knee replacement system, but has not been the subject of long-term clinical and/or radiographic follow-up studies evaluating the device in Thailand. The purpose of the present study was to report the 13-year results of a consecutive series of patients who have had primary total knee replacement performed implanting the LCS devices by a single surgeon, Leelasestaporn C.
Between May 1999 and December 2002, the author performed 161 consecutive total knee arthroplasties in 138 patients with LCS rotating-platform device by the Ethic Committee approval. All components were cemented. The average age of the patients at the time of operation was 64.67 years old (range 47-84). One hundred twenty two patients (141 knees) were female, and sixteen patients (20 knees) were male. Data analysis was performed retrospectively on the 161 knees (138 patients) that were followed for more than ten years. Kaplan-Meier survivorship curves were generated using revision as the end point. The Knee Society Score (KSS) and range of motion (ROM) were evaluated for clinical assessment and plane radiographs were used to evaluate implant problems.
At the thirteen years follow-up, 101 patients (124 knees) were alive, 13 patients (13 knees) died, and 24 patients (24 knees) were lost to follow-up. Only one patient (1 knee) was revised during this period due to late-infection. The survivorship rate was 99.31% at 13 years for all knees, with an average ROM of 127.08 degrees. The average knee score and function score at end of follow-up were 98.62 and 98.69, respectively.
The LCS system, in Thailand, provides predictable results in tri-compartmental arthritis of the knee, after 13 years follow-up with 99.31% survivorship rate or 100% survivorship rate for aseptic loosening condition and excellent-knee society scores.
低接触应力（LCS）旋转平台活动轴承膝关节置换系统是一款领先的、在全球范围内使用的膝关节置换系统，但在泰国尚未有针对该装置的长期临床和/或影像学随访研究。本研究的目的是报告由同一位外科医生Leelasestaporn C为一系列连续患者进行初次全膝关节置换并植入LCS装置后的13年结果。
在1999年5月至2002年12月期间，经伦理委员会批准，作者为138例患者连续进行了161例使用LCS旋转平台装置的全膝关节置换术。所有组件均采用骨水泥固定。手术时患者的平均年龄为64.67岁（范围47 - 84岁）。122例患者（141膝）为女性，16例患者（20膝）为男性。对随访超过十年的161膝（138例患者）进行回顾性数据分析。以翻修为终点生成Kaplan - Meier生存曲线。采用膝关节协会评分（KSS）和活动范围（ROM）进行临床评估，并使用平面X线片评估植入物问题。
在13年随访时，101例患者（124膝）存活，13例患者（13膝）死亡，24例患者（24膝）失访。在此期间，仅1例患者（1膝）因晚期感染进行了翻修。所有膝关节在13年时的生存率为99.31%，平均ROM为127.08度。随访结束时的平均膝关节评分和功能评分分别为98.62和98.69。
在泰国，LCS系统在膝关节三髁关节炎患者中提供了可预测的结果，经过13年随访，生存率为99.31%，无菌性松动情况下生存率为100%，且膝关节协会评分优异。
