Maguire Gerald Q, Noz Marilyn E, Olivecrona Henrik, Zeleznik Michael P, Weidenhielm Lars
School of Information and Communication Technology, KTH Royal Institute of Technology, Isafjordsgatan 26, 418 164-40 Stockholm, Sweden.
Department of Radiology, New York University, 550 First Avenue TSHW232, New York, NY 10016, USA.
ScientificWorldJournal. 2014 Jan 22;2014:528407. doi: 10.1155/2014/528407. eCollection 2014.
As the most advantageous total hip arthroplasty (THA) operation is the first, timely replacement of only the liner is socially and economically important because the utilization of THA is increasing as younger and more active patients are receiving implants and they are living longer. Automatic algorithms were developed to infer liner wear by estimating the separation between the acetabular cup and femoral component head given a computed tomography (CT) volume. Two series of CT volumes of a hip phantom were acquired with the femoral component head placed at 14 different positions relative to the acetabular cup. The mean and standard deviation (SD) of the diameter of the acetabular cup and femoral component head, in addition to the range of error in the expected wear values and the repeatability of all the measurements, were calculated. The algorithms resulted in a mean (± SD) for the diameter of the acetabular cup of 54.21 (± 0.011) mm and for the femoral component head of 22.09 (± 0.02) mm. The wear error was ± 0.1 mm and the repeatability was 0.077 mm. This approach is applicable clinically as it utilizes readily available computed tomography imaging systems and requires only five minutes of human interaction.
由于最有利的全髋关节置换术（THA）首次手术是及时仅更换衬垫，这在社会和经济方面都很重要，因为随着越来越多年轻且活动量大的患者接受植入物并且寿命延长，THA的使用率正在上升。通过给定计算机断层扫描（CT）容积估计髋臼杯与股骨部件头部之间的间距，开发了自动算法来推断衬垫磨损。获取了髋关节模型的两组CT容积，其中股骨部件头部相对于髋臼杯处于14个不同位置。计算了髋臼杯和股骨部件头部直径的平均值和标准差（SD），以及预期磨损值的误差范围和所有测量的重复性。算法得出髋臼杯直径的平均值（±SD）为54.21（±0.011）mm，股骨部件头部直径的平均值（±SD）为22.09（±0.02）mm。磨损误差为±0.1mm，重复性为0.077mm。这种方法在临床上是适用的，因为它利用了现成的计算机断层扫描成像系统，并且只需要五分钟的人工干预。
