Anatomical study based on 3D-CT image reconstruction of the hip rotation center and femoral offset in a Chinese population: preoperative implications in total hip arthroplasty
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Several anatomical studies regarding the value of hip rotation center (HRC) and femoral offset (FO) have been performed in Western populations. However, there are a few data on hip morphological values in the Chinese population based on CT scans. This study measured the values of the hip and pelvis, especially HRC and FO, in a Chinese population and compared them with the published values obtained from Western populations.
Patients and methods
One hundred patients (50 females and 50 males) were included in the present study, and 3D-CT reconstructions of the hip and pelvis were generated. The mean age was 51.4 ± 8.9 years and mean body mass index (BMI) was 23.5 ± 2.6 kg/m2. All the morphologic measurements were compared between genders and sides, and the relationships between different parameters were analyzed.
The mean FO values were 38.4 ± 4.7 mm and 35.6 ± 4.4 mm for the males and females, respectively. A significant negative correlation was noted between FO and neck shaft angle (NSA) in both genders (r = − 0.262, P = 0.009 for the males, r = − 0.350, P ≤ 0.001 for the females). A significant positive correlation was found between horizontal distance (HD) and diameter of the femoral head (DFH) in both genders (r = 0.734, P ≤ 0.001 for the males, r = 0.658, P ≤ 0.001 for the females). A significant positive correlation was noted between HD and pelvic width (PW) in males (r = 0.455, P ≤ 0.001). A significant positive correlation was also noted between HD and pelvic height (PH) in males (r = 0.318, P ≤ 0.001). A significant positive correlation was observed between FO and pelvic cavity height (PCH) in males (r = 0.411, P ≤ 0.001), and a significant positive correlation was observed between VD and PCH in females (r = 0.497, P ≤ 0.001). The tip of the greater trochanter was, on average, 7.0 mm higher than the femoral head center. Relationships between DFH and pelvic morphometric parameters were also observed.
The present morphological data and the relationships between them can be applied to design better ethnic-specific THA prostheses and preoperative plans.
KeywordsAnatomy Pelvis Total hip arthroplasty Image reconstruction
This work has received the financial support from the National Natural Science Foundation of China (81672184), Key Program of Science and Technique Development Foundation in Jiangsu Province (BE2015627), Research Project of Jiangsu Provincial Health Department (H201528), China Postdoctoral Science Foundation Funded Project (2016M591929, 2017T100408), and Jiangsu Provincial Medical Youth Talent (QNRC2016801).
KJG and XZ: protocol development. LHY, XZ, and RL: data collection. ZYZ, JLT, and CWB: data analysis. LHY and FCZ: manuscript writing.
Compliance with ethical standards
Conflict of interest
The author declares that they have no conflict of interest.
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