Ryd L, Toksvig-Larsen S
Department of Orthopedics, University Hospital, Lund, Sweden.
J Orthop Res. 1993 Jan;11(1):142-8. doi: 10.1002/jor.1100110116.
The fixation of cemented and noncemented tibial components in 19 total knee arthroplasties was examined 3 to 10 weeks postoperatively with roentgen stereophotogrammetric analysis. Physiologic external forces were applied either in outward-inward rotation or as eccentric posterior loading generated by squatting. In one case there was no motion, while in the remaining 18 cases relative interface motion of up to 1.3 mm was found. In some cases, the largest motion was found during inward-outward rotatory stress, while in others, the largest motion was found during squatting. Posterior tilt was weakly correlated with posterior displacement of the femoral component on the tibia during squatting (r2 = 0.323, p < 0.05). For the noncemented cases, the initial fixation to bone was probably insufficient, and ingrowth of bone would not have been achieved. For the cemented cases, motion of the implant was reduced. Given the short postoperative time and the probable absence of any substantial fibrous tissue membrane, we suggest that the observed motion represented elastic deformation of the bone.
通过X线立体摄影测量分析，对19例全膝关节置换术后3至10周的骨水泥型和非骨水泥型胫骨假体固定情况进行了检查。施加了生理外力，包括内外旋转或蹲坐产生的偏心后负荷。1例无运动，其余18例发现相对界面运动高达1.3毫米。在某些情况下，最大运动出现在内外旋转应力期间，而在其他情况下，最大运动出现在蹲坐期间。后倾与蹲坐时股骨部件在胫骨上的后移呈弱相关（r2 = 0.323，p < 0.05）。对于非骨水泥型病例，最初对骨的固定可能不足，且未实现骨长入。对于骨水泥型病例，植入物的运动减少。鉴于术后时间短且可能不存在任何实质性纤维组织膜，我们认为观察到的运动代表了骨的弹性变形。
