De Geus Thea, Farrell Terence, Kavanagh Eoin
Department of Radiology, Mater Misericordiae University Hospital, Dublin 7, Dublin, Ireland.
Radiol Case Rep. 2019 Jan 5;14(3):405-409. doi: 10.1016/j.radcr.2018.12.005. eCollection 2019 Mar.
The mobile bearing Oxford Unicompartmental Knee Prosthesis (OUKP) is the most commonly used treatment of osteoarthritis confined to 1 compartment of the knee. Dislocation of the mobile bearing is an uncommon but recognized complication of the OUKP. Patients typically present with severe pain and reduced range of motion of the affected knee. Radiological evaluation of OUKP can be challenging and requires knowledge of the prosthesis components and common complication patterns. Dislocation of the bearing can easily be overlooked on plain radiographs as the bearing is radiolucent, distinguished only by radiopaque markers. Further imaging in particular with CT may be required to adequately evaluate for prosthesis complications. Advances in prosthesis design and surgical technique may reduce the rate of bearing dislocation.
活动平台牛津单髁膝关节假体（OUKP）是治疗局限于膝关节单髁的骨关节炎最常用的方法。活动平台脱位是OUKP一种罕见但已已公认的并发症。患者通常表现为患膝剧痛和活动范围减小。OUKP的影像学评估具有挑战性，需要了解假体组件和常见并发症模式。由于活动平台是透X线的，仅通过不透X线的标记物区分，因此在普通X线片上很容易忽略活动平台脱位。可能需要进一步成像，尤其是CT，以充分评估假体并发症。假体设计和手术技术的进步可能会降低活动平台脱位的发生率。
