Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-Cho Chuo-Ku, Kobe, Hyogo, 650-0017, Japan,
Int Orthop. 2014 Jun;38(6):1155-8. doi: 10.1007/s00264-013-2271-0. Epub 2014 Jan 11.
The use of screws can enhance immediate cup fixation, but the influence of screw insertion on cup position has not previously been measured. The purpose of this study was to quantitatively evaluate the effect of intra-operative screw fixation on acetabular component alignment that has been inserted with the use of a navigation system.
We used a navigation system to measure cup alignment at the time of press-fit and after screw fixation in 144 hips undergoing total hip arthroplasty. We also compared those findings with factors measured from postoperative radiographs.
The mean intra-operative change of cup position was 1.78° for inclination and 1.81° for anteversion. The intra-operative change of anteversion correlated with the number of screws. The intra-operative change of inclination also correlated with medial hip centre.
The insertion of screws can induce changes in cup alignment, especially when multiple screws are used or if a more medial hip centre is required for rigid acetabular fixation.
螺钉的使用可以增强髋臼杯即刻固定,但螺钉置入对髋臼杯位置的影响尚未被测量。本研究的目的是定量评估在使用导航系统置入髋臼杯后,术中螺钉固定对髋臼杯组件对线的影响。
我们使用导航系统测量了 144 例全髋关节置换术中压配时和螺钉固定后的髋臼杯位置。我们还将这些发现与术后 X 线片测量的因素进行了比较。
髋臼杯位置的平均术中变化为倾斜度 1.78°,前倾角 1.81°。术中前倾角的变化与螺钉数量相关。倾斜度的术中变化也与内侧髋关节中心相关。
螺钉的置入会引起髋臼杯位置的变化,尤其是当使用多个螺钉或需要更内侧的髋关节中心来实现刚性髋臼固定时。