We measured wear and creep in conventional tibial inserts retrieved after total knee arthroplasty by using Raman spectroscopy. The Raman spectra of thirteen tibial inserts retrieved after total knee arthroplasty with a mean in vivo time of 34.3 months were confocally measured along their bearing subsurface, and then from bearing surface to backside after cutting. The amounts of creep, wear, and wear rate in the medial and lateral load zone were computed from the full-width at half-maximum of a selected Raman band as a characteristic parameter related to strain. In all retrievals, the strain was higher than that of pristine samples at the bearing subsurface, and we observed a correlation between full-width at half-maximum and body weight/body mass index in both load zones. The amount of total penetration, creep, and wear were 0.27 ± 0.21, 0.082 ± 0.031, 0.19 ± 0.18 mm in the medial load zone and 0.22 ± 0.18, 0.080 ± 0.040, 0.14 ± 0.14 mm in the lateral load zone, respectively. The amount of wear in both load zones was strongly correlated with the in vivo time. The wear rate in eleven retrievals excluding an extremely short excised sample was 0.055 ± 0.020 mm/year in the medial load zone and 0.041 ± 0.020 mm/year in the lateral load zone. Raman spectroscopy proved very useful in separating creep and wear components of thickness reduction, thus revealing the wear rate of the UHMWPE material.

我们使用拉曼光谱法测量了全膝关节置换术后常规胫骨插入物的磨损和蠕变。全膝关节置换术后13个胫骨插入物的拉曼光谱，体内平均沿其轴承下表面共凹测量34.3个月的时间，然后切割后从轴承表面到背面。根据所选拉曼带的半峰全宽作为与应变相关的特征参数，计算内侧和外侧载荷区的蠕变，磨损和磨损率。在所有取回中，应变都高于原始样品在轴承下表面的应变，并且我们观察到两个最大载荷区域的半最大全宽与体重/体重指数之间存在相关性。在内侧载荷区的总穿透，蠕变和磨损量分别为0.27±0.21、0.082±0.031、0.19±0.18 mm和在横向载荷区的0.22±0.18、0.080±0.040、0.14±0.14 mm。两个负荷区的磨损量与体内时间。在11次取回中（不包括极短的切除样品）的磨损率在内侧载荷区为0.055±0.020 mm /年，在外侧载荷区为0.041±0.020 mm /年。拉曼光谱证明在分离厚度减小的蠕变和磨损成分方面非常有用，从而揭示了超高分子量聚乙烯材料的磨损率。