Variants of Acetabular Deformity in Developmental Dysplasia of the Hip in Young Children

Abstract

Background. The choice of pelvic reconstruction technique in children with developmental dysplasia of the hip (DDH) has been the subject of discussion for many years and is often determined by personal preferences of a surgeon rather than by X-ray anatomical state of the acetabulum. The variants of its anatomy structure have still not been reflected in the available scientific literature.

Aim of the study — to identify the most typical variants of acetabular deformation in children with varying severity of DDH, based on the X-ray anatomical analysis of structure of the acetabulum.

Methods. The study was based on the results of examination of 200 patients (200 hip joints) aged 2 to 4 years (3.1±0.45) with Tönnis grade II-IV DDH. All patients underwent conventional clinical and radiological examination. The latter consisted of hip radiography in several views and computed tomography. We took the values of acetabular index, the extent of acetabulum arch and the presence or the absence of bone oriel as criteria for determination of the most typical variants of acetabular deformation.

Results. X-ray analysis of anatomical structure of the acetabulum in young children with varying severity of DDH revealed 3 most common variants of acetabular deformity: 1 — moderate underdevelopment of the acetabulum arch (AI ≤ 35°), its shortening and the presence of bone oriel; 2 — pronounced underdevelopment of the acetabulum arch (AI > 35°), its shortening and the presence of bone oriel; 3 — pronounced underdevelopment of the acetabulum arch (AI > 35°), its sufficient length and the absence of bone oriel.

Conclusion. Suggested supplements to existing Tönnis DDH classification might become basic for choosing the surgical correction technique of the acetabulum in children with different severity of DDH.

Keywords

developmental dysplasia of the hip / DDH / children / acetabular deformity / pelvic osteotomy

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Funding

Минздрав РоссииRussian Ministry of Health(121031700122-6)

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