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. 2014 Jul 19:9:58.
doi: 10.1186/s13018-014-0058-7.

An intraoperative device to restore femoral offset in total hip arthroplasty

Enxing Xue, Zhen Su, Chengwang Chen, Paul Kim Chiu Wong, Hong Wen, Yu Zhang  1
Affiliations

An intraoperative device to restore femoral offset in total hip arthroplasty

Enxing Xue et al. J Orthop Surg Res. .

Abstract

Background: Leg length discrepancy (LLD) after total hip arthroplasty (THA) can lead to unsatisfactory outcome. Our objective was to design and evaluate a simple and reliable intraoperative device (Length-offset Lever) to minimize leg length discrepancy.

Methods: This device was used in 51 patients undergoing primary total hip replacements. The leg length discrepancy was measured pre- and postoperatively based on plain radiographs.

Results: Preoperative radiographic leg length discrepancy averaged 13.5 ± 6.2 mm. Leg length discrepancy showed significant improvement, with a postoperative average of 4.1 ± 2.3 mm (p < 0.0001). There were no complications associated with this device.

Conclusions: The 'Length-offset Lever' is a useful intraoperative tool to restore anatomic femoral offset and height of femoral head.

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Figures

Figure 1
Figure 1
Length-offset Lever consists of a base and a measuring ruler.
Figure 2
Figure 2
The method to determine the center of the femoral head. (A) Three points on the boundary of femoral head. (B) The center is equidistant to three points by compasses.
Figure 3
Figure 3
Length-offset Lever for THA. (A) Femoral offset measurement using ‘Length-offset Lever’ before femoral preparation. (B) Femoral offset measurement with trial components.
Figure 4
Figure 4
Radiographs of pelvis of a 50-year-old female. Presented with severe pain and limited range of motion in her right hip, secondary to osteoarthritis. (A) Preoperative limb-length inequality was 14.6 mm. (B) THA was performed using the Length-offset Lever (Figure 1). Postoperative limb-length inequality was 0 mm. The patient had excellent pain relief and functional results following the THA and no complications.
See this image and copyright information in PMC

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