A simple method to minimize leg length discrepancy in hip hemiarthroplasty
Received 13 May 2019
Accepted for publication 18 August 2019
Published 5 September 2019 Volume 2019:14 Pages 1601—1605
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Colin Mak
Peer reviewer comments 2
Editor who approved publication: Dr Zhi-Ying Wu
Guodong Wang,1,2 Ai Guo,1 Fei Yu,1 Bo Yang,1 Haomiao Yu,1 Naicheng Diao,1 Lifeng Ma,1 Hua Qiang,2 Erhong Zhao2
1Department of Orthopaedics, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, People’s Republic of China; 2Department of Orthopaedics, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, People’s Republic of China
Correspondence: Ai Guo
Department of Orthopaedics, Beijing Friendship Hospital, Capital Medical University, No 95, YongAn Road, Xicheng District, Beijing 100050, People’s Republic of China
Tel +86 106 313 8293
Purpose: We developed a simple method to minimize leg length discrepancy (LLD) during hip arthroplasty. The purpose of this study is to evaluate the accuracy of the method.
Patients and methods: A total of 47 patients who suffered from unilateral femoral neck fracture and underwent hip hemiarthroplasty between 2015 and 2018 were enrolled in this study. We measured the diameter of the contralateral femoral head (D) and the distance (L) between the center of the femoral head and the top of lesser trochanter in the antero-posterior pelvic X-ray view before the operation, the ratio (R) of D to L was calculated. During the operation, the diameter of the femoral head (d) was measured using a Vernier caliper. Then, the distance should be obtained from the center of the femoral head prosthesis to the lesser trochanter was calculated according to the contralateral ratio R.
Results: The mean LLD was 4.4±3.2 mm (−4.0 to 11.1 mm), 80.9% of the patients had LLD <6 mm, 93.6% of the patients with LLD <10 mm, only 6.4% ≥10 mm LLD.
Conclusion: This method is a simple, cost-effective, fast and accurate way to reduce the postoperative leg length discrepancy.
Keywords: leg length discrepancy, hip arthroplasty, femoral neck fracture, contralateral side, measurement
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