Morphological Feature of the Fitting Curves of Proximal Femoral Canal in Adults with Developmental Dysplasia of the Hip
10.16156/j.1004-7220.2019.04.13
- VernacularTitle:先天性髋关节发育不良股骨近端髓腔内径曲线形态
- Author:
Ziyi WEI
1
;
Guoqiang ZHANG
2
;
Xinzheng QI
1
;
Huizhi WANG
1
;
Min ZHANG
3
;
Xinshuo MA
1
;
Jie YAO
1
;
Chengkung CHENG
3
Author Information
1. Beijing Advanced Innovation Centre for Biomedical Engineering, Beihang University
2. Department of Orthopaedic Surgery, Chinese General Hospital of People’s Liberation Army
3. Beijing Advanced Innovation Centre for Biomedical Engineering, Beihang University；School of Biological Science and Medical Engineering, Beihang University
- Publication Type:Journal Article
- Keywords:
developmental dysplasia of the hip (DDH);
femoral stem;
anatomical morphology;
proximal femur canal
- From:
Journal of Medical Biomechanics
2019;34(4):E417-E424
- CountryChina
- Language:Chinese
-
Abstract:
Objective To measure and investigate the anatomical characteristics of the proximal femur canal curves in patients with developmental dysplasia of the hip (DDH), and to provide references for the design of femoral stem of DDH patients. Methods Three-dimensional reconstructions of the proximal femur were conducted from the CT data, and the anatomical morphology characteristics were obtained from 64 patients with DDH (74 hips, 12 males, 52 females, average age of 45.3 years) and 30 healthy controls (30 hips, 21 males, 9 females, average age of 29.4 years). Multiple anteroposterior diameter and mediolateral diameter around the lesser trochanter at different heights and the fitting curves of different groups were obtained. Results The femoral neck anteversion angle, neck-shaft angle, height of the isthmus, canal flare index (CFI), femoral head diameter and femoral offset of DDH patients and healthy controls were 26.39°±14.74° and 15.68°±7.95°, 125.65°±5.73° and 129.19°±5.80°, (99.14±14.62) mm and (110.13±11.73) mm, 3.63±0.77 and 4.45±0.79, (44.01±5.75) mm and (47.26±3.94) mm, (31.80±3.82) mm and (36.42±4.84) mm, respectively. DDH group had the significantly greater femoral neck anteversion angle, and other anatomical morphology characteristics were significantly smaller than the control group. The obtained anteroposterior diameter, mediolateral diameter and the fitting curves showed that DDH group had narrow medullary cavity and forward shifting anteroposterior diameter. In addition, there was a statistical significance between the Crowe Ⅳ DDH and other types of DDH, and deformation degree of the femur increased with the increase of DDH type. Conclusions The proximal femur of DDH patients was significantly different from the healthy controls. Moreover, there were significantly morphological differences between different types of DDH. The research findings can be used as quantitative references for understanding the morphological feature of DDH patients and the corresponding design of femoral stem for DDH patients.
