The Three-Dimensional Morphology of Femoral Medullary Cavity in the Developmental Dysplasia of the Hip
| Autor: | Qing-Qing Yang, Guo-Qiang Zhang, Qing-Yuan Zheng, Xin-Zheng Qi, Cheng-Kung Cheng, Min Zhang, Jing-Yang Sun, Bolun Liu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Histology
Medullary cavity Biomedical Engineering Bioengineering 03 medical and health sciences Three dimensional morphology 0302 clinical medicine femoral medullary torsion angle Medicine femoral medullary roundness index Original Research 030203 arthritis & rheumatology 030222 orthopedics Developmental dysplasia business.industry hip morphology Femoral canal deformity of the femur Bioengineering and Biotechnology Anatomy Apex (geometry) Cross section (geometry) medicine.anatomical_structure Excessive femoral anteversion Lesser Trochanter femoral medullary cavity DDH business TP248.13-248.65 Biotechnology |
| Zdroj: | Frontiers in Bioengineering and Biotechnology Frontiers in Bioengineering and Biotechnology, Vol 9 (2021) |
| ISSN: | 2296-4185 |
| Popis: | ObjectiveThis study aimed to assess the morphology of the femoral medullary canal in subjects with developmental dysplasia of the hip (DDH) with the intent of improving the design of femoral stems in total hip arthroplasty.MethodsComputed tomography images of 56 DDH hips, which were classified into Crowe I to Crowe IV, and 30 normal hips were collected and used to reconstruct three-dimensional morphology of the femoral medullary cavity. Images of twenty-one cross sections were taken from 20 mm above the apex of the lesser trochanter to the isthmus. The morphology of femoral cavity was evaluated on each cross section for the longest canal diameter, the femoral medullary torsion angle (FMTA), and the femoral medullary roundness index (FMRI).ResultsThe Crowe IV group displayed the narrowest medullary canal in the region superior to the end of the lesser trochanter, but then gradually aligned with the medullary diameter of the other groups down to the isthmus. The FMTA along the femoral cavity increased with the severity of DDH, but the rate of variation of FMTA along the femoral canal was consistent in the DDH groups. The DDH hips generally showed a larger FMRI than the normal hips, indicating more elliptical shapes.ConclusionA femoral stem with a cone shape in the proximal femur and a cylindrical shape for the remainder down to the isthmus may benefit the subjects with severe DDH. This design could protect bone, recover excessive femoral anteversion and facilitate the implantation in the narrow medullary canal. |
| Databáze: | OpenAIRE |
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