Abstract：
BACKGROUND:The acetabular teardrop is often used to guide acetabular component placement in total hip arthroplasty (THA). Placing the lower acetabular component aspect at the same level as the lower teardrop edge was assumed to restore the hip center of rotation. Here we radiographically analyzed the relationship between cup center and normal contralateral acetabulum center height on unilateral THA using this placement method. METHODS:A total of 106 unilateral THA cases with normal contralateral acetabula were reviewed and the vertical and horizontal distances in relation to the lower acetabular teardrop edge from both hip joint centers, cup inclination, and anteversion were measured radiographically. The paired t-test was used to compare left and right hip center heights. Scatter plots and Pearson's correlation coefficients were used to evaluate differences in hip center heights, cup anteversion, inclination angles, and medialized cup center distance compared to the contralateral hip joint. RESULTS:Cup center height was significantly greater (P < 0.01) than contralateral hip joint center height (93.4% in the 0-5 mm range, 6.6% >5 mm). There was a weak correlation between hip center height difference and inclination (r = 0.376, P < 0.01) and between difference and anteversion (r = 0.310, P < 0.01) but no correlation between difference and outer cup diameter (r = 0.184, P = 0.058) or difference and medialized cup center distance (r = -0.098, P = 0.318). CONCLUSIONS:Although this method did not exactly replicate anatomic hip center height, the clinical significance of cup center height and anatomic hip center height differences is negligible. This acetabular component placement method has high simplicity, reliability, and stability.
journal_name
Chin Med J (Engl)journal_title
Chinese medical journalauthors
Lu Y,Cheng L,Guo W,Yu Q,Gao F,Zhang Q,Liu Z,Sun W,Shi Zsubject
Has Abstractpub_date
2014-01-01 00:00:00pages
3915-20issue
22eissn
0366-6999issn
2542-5641journal_volume
127pub_type
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pub_type： 杂志文章
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pub_type： 杂志文章,评审
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doi：
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pub_type： 杂志文章,多中心研究,随机对照试验
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doi：
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doi：
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doi：
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doi：
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doi：
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pub_type： 杂志文章
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doi：
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