Medial Tibial Stress Shielding: A Limitation of Cobalt Chromium Tibial Baseplates

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• 作者：J. Ryan Martin ; MD^a ; Chad D. Watts ; MD^b ; Daniel L. Levy ; BS^a ; Raymond H. Kim ; MD^a ; ^c ; ^d ;
• 关键词：tibial baseplate ; stress shielding ; modulus of elasticity ; all polyethylene ; cobalt chromium ; titanium
• 刊名：The Journal of Arthroplasty
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：32
• 期：2
• 页码：558-562
• 全文大小：613 K
• 卷排序：32

文摘

Stress shielding is a well-recognized complication associated with total knee arthroplasty. However, this phenomenon has not been thoroughly described. Specifically, no study to our knowledge has evaluated the radiographic impact of utilizing various tibial component compositions on tibial stress shielding.MethodsWe retrospectively reviewed 3 cohorts of 50 patients that had a preoperative varus deformity and were implanted with a titanium, cobalt chromium (CoCr), or an all polyethylene tibial implant. A radiographic comparative analysis was performed to evaluate the amount of medial tibial bone loss in each cohort. In addition, a clinical outcomes analysis was performed on the 3 cohorts.ResultsThe CoCr was noted to have a statistically significant increase in medial tibial bone loss compared with the other 2 cohorts. The all polyethylene cohort had a statistically significantly higher final Knee Society Score and was associated with the least amount of stress shielding.ConclusionThe CoCr tray is the most rigid of 3 implants that were compared in this study. Interestingly, this cohort had the highest amount of medial tibial bone loss. In addition, 1 patient in the CoCr cohort had medial soft tissue irritation which was attributed to a prominent medial tibial tray which required revision surgery to mitigate the symptoms.