Side-to-side variation in normal femoral morphology: 3D CT analysis of 122 femurs

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• 作者：D. Dimitriou^a ; T.-Y. Tsai^a ; B. Yue^b ; H.E. Rubash^a ; Y.-M. Kwon^a ; G. Li^a ; ^{gli1@mgh.harvard.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Proximal femur ; Asymmetry ; Total hip arthroplasty ; Offset ; Anteversion ; Hip joint center ; Geommetric morphometrics
• 刊名：Orthopaedics & Traumatology: Surgery & Research
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：102
• 期：1
• 页码：91-97
• 全文大小：2182 K

文摘

The contralateral femur is often used as reference for reconstruction in unilateral hip joint pathology. The objective of this study was to quantify the side-to-side variation in proximal femur. We hypothesized that significant side-to-side differences exist between left and right femur with implications for preoperative planning and leg length discrepancy following hip arthroplasty.

Materials and methods

CT-based 3D femoral models were reconstructed for 122 paired femurs in 61 young healthy subjects (46.9 ± 6.8 years) with no history of hip pathology. Side-to-side differences of several femoral morphologic parameters, including femoral head diameter, femoral anteversion, horizontal offset and femoral head center location, were compared and correlated with demographic factors using multiple linear regression.

Results

Significant side-to-side differences (P < 0.01) were found in femoral anteversion (4.3 ± 3.8°; range: 0.2° to 17.3°), horizontal offset (2.5 ± 2.1 mm; range: 0.1 to 10.3 mm), and femoral head center location (7.1 ± 3.8 mm; range: 0.5 to 19.4 mm). The difference in femoral anteversion was strongly correlated with the difference in neck diameter (R² = 0.79), whereas the difference in horizontal femoral offset was highly correlated with the head diameter difference (R² = 0.72). Femoral head center difference was correlated with the femoral anteversion, horizontal offset and neck-shaft-angle difference (R² = 0.82).

Discussion

Relying on the anatomic landmarks of the contralateral femur during hip arthroplasty may not necessarily result in restoration of native anatomy and leg-length. Knowledge of the baseline side-to-side asymmetry could provide a range of error that would be tolerable following hip reconstruction.

Level of evidence

Level IV.

Type of study

Retrospective observational study.