Ghaffari M, Nickmanesh R, Tamannaee N, Farahmand F
Robotic Surgery lab, Research Center of Biomedical Technology and Robotics, Tehran University of Medical Sciences, Tehran, Iran.
Annu Int Conf IEEE Eng Med Biol Soc. 2012;2012:6801-4. doi: 10.1109/EMBC.2012.6347556.
Hip dislocation is one of the most frequent complications after total hip arthroplasty. Impingement and dislocation might be caused due to misalignment of the acetabular cup during surgery, or performing dislocation-prone activities afterwards. A finite element model was developed to predict the impingement and dislocation behavior of the prosthetic joint, for different combinations of cup orientation and patient maneuver. Four dislocation-prone activities of daily life and 25 cup orientations were analyzed to determine how close they are to the impingement and subsequent dislocation events. The angular margin results obtained indicated that the sit-to-stand and standing while bending at the waist are prone to dislocation, in particular when the cup anteversion angle is small.
髋关节脱位是全髋关节置换术后最常见的并发症之一。手术过程中髋臼杯的排列不齐或术后进行易导致脱位的活动，都可能引起撞击和脱位。针对髋臼杯方向和患者动作的不同组合，建立了一个有限元模型来预测人工关节的撞击和脱位行为。分析了四种日常生活中易导致脱位的活动以及25种髋臼杯方向，以确定它们与撞击及随后脱位事件的接近程度。所获得的角度边缘结果表明，从坐起到站立以及弯腰站立时容易发生脱位，尤其是当髋臼杯前倾角较小时。
