Antéversion du pivot fémoral avec tiges sans ciment effilé dans les dysplasies de hanche : comparaison selon la voie d’abord postérolatérale ou antérolatérale - 07/11/19
Comparative study of stem anteversion using a cementless tapered wedge stem in dysplastic hips between the posterolateral and anterolateral approaches
, Daisuke Koga b, Satoshi Ochiai d, Atsushi Okawa b, Hirotaka Haro aAbstract |
Background |
In total hip arthroplasty (THA), the concept of combined anteversion is accepted as one of best indicators of prosthetic joint stability. Technical parameters may influence the stem and cup anteversion. We therefore investigated if stem anteversion could be influenced by surgical approaches in cementless THA using a tapered wedge stem with stem-first technique.
Hypothesis |
We postulated that the type of approach, posterolateral (PLA) or anterolateral approach (ALA), would influence stem anteversion in dysplastic hip patients. We asked: (1) whether stem anteversion was higher in the PLA group and (2) how postoperative stem anteversion was correlated to preoperative femoral anteversion in each group.
Patients and methods |
We retrospectively compared two groups of hips that underwent THA using a tapered wedge stem with the posterolateral (PLA group; 154 hips) or anterolateral (ALA group; 81 hips) approaches. Computed tomography was utilized to measure femoral neck and stem anteversion. To investigate related factors that affect stem anteversion, a stepwise regression analysis was performed.
Results |
The stem anteversion in the PLA and ALA groups was 43.7°±9.8° and 34.0°±12.3°, respectively (p<0.01). The stepwise selection process resulted in a model involving femoral neck anteversion and surgical approach (p<0.01). The stem anteversion of the ALA group (r=0.75, p<0.01) was better correlated to femoral neck anteversion than that of the PLA group (r=0.52, p<0.01).
Discussion |
The stem implantation through the ALA is thought to be more restricted than that through the PLA due to the difference of difficulty in femoral exposure. Tapered wedge stems, which are relatively thin and flat, have a high degree of freedom in the femoral canal. Consequently, in cementless THA using a tapered wedge stem, the surgical approaches affected stem anteversion differently. Stem anteversion was more anatomically restored to femoral neck anteversion through the ALA than through the PLA.
Level of evidence |
III, retrospective case-control study.
Le texte complet de cet article est disponible en PDF.Keywords : Cementless total hip arthroplasty, Femoral neck anteversion, Hip osteoarthritis, Correlation, Computed tomography
| ☆ | Cet article peut être consulté in extenso dans la version anglaise de la revue Orthopaedics & Traumatology: Surgery & Research sur Science Direct (sciencedirect.com) en utilisant le DOI ci-dessus. |
Vol 105 - N° 7
P. 842 - novembre 2019 Retour au numéro
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