A novel classification to guide total hip arthroplasty for adult acetabular dysplasia

Zhu,Chen; Cheng,Meng‑Qi; Cheng,Tao; Ma,Rui‑Xiang; Kong,Rong; Guo,Yong‑Yuan; Qin,Hui; Shi,Si   Feng; Zhang,Xian‑Long

doi:10.3892/etm.2013.1093

A novel classification to guide total hip arthroplasty for adult acetabular dysplasia

Authors:
- Chen Zhu
- Meng‑Qi Cheng
- Tao Cheng
- Rui‑Xiang Ma
- Rong Kong
- Yong‑Yuan Guo
- Hui Qin
- Si Feng Shi
- Xian‑Long Zhang
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Affiliations: Department of Orthopaedic Surgery, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200233, P.R. China, Department of Orthopaedic Surgery, Anhui Provincial Hospital, Anhui Medical University, Hefei, Anhui 230001, P.R. China
Published online on: April 30, 2013 https://doi.org/10.3892/etm.2013.1093
Pages: 216-222

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Abstract

In the field of hip arthroplasties, the secondary fixation of the implants depends directly on the quality of the primary stability. A good acetabular fit and metaphyseal filling between the prostheses and implants improve the initial stabilization, and optimize the transmission of forces to the bone. A precise knowledge of the three‑dimensional acetabular or femoral shape is essential to the selection of adapted implants. A total of 63 patients diagnosed with developmental dysplasia were analyzed by three‑dimensional computed tomography (3DCT), and the preoperative radiographic and 3DCT images were used to assess the acetabular/femoral deformities and variations of the hips. All joints were classified as Crowe type I, and bilateral measurements were taken for 10 patients. The acetabular abnormalities were classified according to the type of deficiency and the section angles of the acetabulum, with 26 hips (36%) classified as an anterior deficiency, 13 hips (18%) as a posterior deficiency and 34 hips (46%) as a lateral deficiency. The femoral side deformities were divided into three types according to the anteversion angle of the femur. A gradual increase in anteversion angle led to secondary rotational anomalies, and a narrowing of the canal at the isthmus. A total of 35 hips (48%) were classified as an F1 type deficiency, femur anteversion angle (FAVA) <30˚; 32 hips (44%) as F2‑type, 30˚≤ FAVA ≤40˚, with mild abnormalities of the femoral canal rotation and the diameter of the isthmus; and 6 hips (8%) as F3 type, FAVA >40˚, with significant abnormalities of the femoral canal rotation and the diameter of the isthmus. This novel classification for adult acetabular dysplasia may provide a useful guide for surgery, and enable an improved selection of a suitable prosthesis.

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