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[Comparison of three measurements of lower extremity length during total hip arthroplasthy]
Bin Xiao1, Xin-hui Guo2, Jian-Hua Wang2
1Department of Orthopaedics the 421st Hospital of PLA Guangzhou 510318 Guangdong China. xiaodcs@sina.com
Insights
The Kirschner wire location method offers the most accurate lower extremity length measurement during total hip arthroplasty (THA). Anatomical landmarks provide the second-best accuracy for THA leg length assessment.
Area of Science:
- Orthopedic Surgery
- Surgical Outcomes
- Biomechanical Measurement
Background:
- Accurate lower extremity length measurement is crucial in total hip arthroplasty (THA) to prevent postoperative complications.
- Existing measurement techniques during THA may have varying degrees of accuracy.
- Identifying reliable methods for assessing leg length equalization is essential for successful THA outcomes.
Purpose of the Study:
- To evaluate and compare the accuracy of three distinct lower extremity length measurement methods employed during total hip arthroplasty (THA).
- To investigate factors influencing the precision of these measurements in the context of THA.
- To determine the optimal method for ensuring leg length equality in THA patients.
Main Methods:
- Retrospective analysis of 145 patients undergoing THA between January 2010 and January 2013.
- Comparison of three measurement techniques: contralateral leg reference (Method A), Kirschner wire location (Method B), and anatomical landmark (Method C).
- Assessment of postoperative lower extremity length difference and incidence of inequality for each method.
Main Results:
- The Kirschner wire location method (Method B) demonstrated the highest accuracy with the lowest incidence of leg length inequality (1.6%).
- The anatomical landmark method (Method C) showed moderate accuracy (11.8% inequality), while the contralateral leg reference method (Method A) had the lowest accuracy (32.3% inequality).
- No significant differences in operative time or blood loss were observed among the groups.
Conclusions:
- The Kirschner wire location method is the most accurate technique for measuring lower extremity length during THA, recommended for most patients.
- The anatomical landmark method is a suitable alternative for THA patients, particularly those with femoral neck fractures.
- Accurate leg length equalization through precise measurement methods is vital for optimizing THA results.
Objective:
To analyze the accuracy of three measurements of lower extremity length during total hip arthroplasty(THA),and explore the causes that influence the accuracy.
Methods:
From January 2010 to January 2013,145 patients underwent THA were retrospectively analyzed. There were 66 males and 79 females,ranging in age from 48 to 89 years with an average of 66.7 years. Their lower extremities were measured by three methods during operation,among them,31 cases with reference method of contralaterallegs (A method) ,63 cases with measurement method of Kirschner wire location (B method), and other 51 cases with measurement method of anatomical landmark (C method). The accuracy of the three measurements and the incidence rate of length inequality of lower extremity were analyzed.
Results:
All patients were followed up,there was no significant differences in the operation time and the intraoperative blood loss among three groups. The difference of lower extremity length with A,B,C method were respectively (8.7+/-5.7),(3.1+/-2.6), (5.6+/-5.3) mm after operation; there were significant difference between any two groups. The accuracy of three methods from high to low were respectively B,C,A method. The incidence rate of length inequality of lower extremity with A, B, C method were respectively 32.3%, 1.6%, 11.8%, the incidence rate with A method was higher than that other two methods ; and there was no significant difference between B method and C method.
Conclusion:
The measurement method of Kirschner wire location has the best accuracy in the three methods and the measurement method of anatomical landmark is the second. The measurement method of Kirschner wire location is recommended in all THA except for the patients with femoral neck fracture. And the measurement method of anatomical landmark can be used in the patients with femoral neck fracture.
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