J Korean Orthop Assoc.
1974 Mar;9(1):27-33. 10.4055/jkoa.1974.9.1.27.
Comparison of the Lever Arm Changes in the Charnley Total Hip Arthroplasty
- Affiliations
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- 1Y. Y. Kim Orthopeadic Clinic, Busan, Korea.
- KMID: 2471593
- DOI: http://doi.org/10.4055/jkoa.1974.9.1.27
Abstract
- A study of the lever arm changes of 33 total hip replacements of Charnley type, done from May 1972 to February 1974. revealed a significant change of ratio following the operation. Three cases could not be measured because of poor axis of the preoperative radiogram. The unilateral group A of IT Charnley low friction series resulted in a preoperative ratio range from 1.30:1 to 2.10:1 with an average of 1.70:1. The postoperative ratio varied from 1.03 to 1.38 with an average of 1.26. Group B consisting of 6 bilateral Charnley cases resulted in a preoperative ratio range from 1.39 to 1.81 with an average of 1.58. The postoperative ratio varied from 1.01 to 1.46 with an average of 1.24. Group C comprised 7 cases of the assessment of low friction arthroplasty in old tuberculous hips. In these cases it was impossible to measure the preoperative ratio range because of old destruction and distortion of the femoral head. Therefore the normal side of the opposite hip was traced for comparison. The healthy hip of the preoperative ratio range was from 1.36 to 1.70 with an average of 1.56. The postoperative ratio of the affected hip varied from 1.05 to 1.43 with an average of 1.24. The size of the acetabular angle (Sharp and depth of the acetabulum is added as a preoperative guidance when performing surgery. In addition 2 cases of a McKee-Farrar series are included comparison with this study.
Reference
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References
1. Charnley J.The classic arthroplasty of thasop new operation. Clin. Orthop. 95(4):1973.2. Sharp I.K.Acetabular dysplasia, The acetabular angle. J, Bone Joint Surg. 43B(268):1961.3. Charnley J., Zoran Cupic. The nine and ten year results of the low-friction arthroplasty of the hip, Cli. Orthop. 95(9):1973.
