Renkawitz Tobias, Schuster Tibor, Herold Thomas, Goessmann Holger, Sendtner Ernst, Grifka Joachim, Kalteis Thomas
Department of Orthopaedic Surgery, Regensburg University Medical Centre, sklepios Klinikum Bad Abbach, Bad Abbach, Germany.
Int J Med Robot. 2009 Jun;5(2):192-7. doi: 10.1002/rcs.250.
A novel imageless measurement algorithm to assess leg length (LL) and offset (OS) changes during total hip arthroplasty (THA) has been established, the purpose of this study was to describe the process and establish whether or not it is accurate.
THA was performed on 17 cadaver hip specimens. LL and OS changes were determined intra-operatively, using an imageless navigation system. Pre- and postoperatively, all specimens had a computed tomography scan (CT) and the LL and OS changes were analysed by two blinded investigators.
With mean differences of less than 1 mm (LL, 0.74; SD, 2.4 mm; OS, 0.89; SD, 1.8 mm) supported by substantial significant correlations [r = 0.83 (LL) and r = 0.92 (OS)] imageless navigation values demonstrated a high accuracy when compared to CT measurements.
Intra-operative LL and OS measures are reliable and accurate when using an imageless calculation algorithm which stores the position of the femoral reference frame in relation to the pelvic coordinate system before and after reconstruction.
已建立一种用于评估全髋关节置换术（THA）期间腿长（LL）和偏移（OS）变化的新型无图像测量算法，本研究旨在描述该过程并确定其是否准确。
对17个尸体髋关节标本进行全髋关节置换术。使用无图像导航系统在术中确定腿长和偏移变化。术前和术后，所有标本均进行计算机断层扫描（CT），并由两名不知情的研究人员分析腿长和偏移变化。
平均差异小于1毫米（腿长，0.74；标准差，2.4毫米；偏移，0.89；标准差，1.8毫米），并具有显著的相关性[r = 0.83（腿长）和r = 0.92（偏移）]，与CT测量相比，无图像导航值显示出较高的准确性。
当使用一种在重建前后存储股骨参考框架相对于骨盆坐标系位置的无图像计算算法时，术中腿长和偏移测量是可靠且准确的。
