The most common measurement in acetabular dysplasia is the lateral center-edge angle on a plain anterior-posterior radiograph of the pelvis 2,4. Radiographic assessment of acetabular dysplasia or adult hip dysplasia includes plain radiographs of the pelvis and additional planes as the false profile view of Lequesne, cross-table lateral or frog-leg lateral views.Ĭross-sectional imaging is advised for better three-dimensional characterization, preoperative planning 3 and the detection of chondral and labral lesions. Other schemes differentiate anterior, posterior and global or lateral deficiencies 2. One grading scheme subdivides the acetabular dysplasia into the following patterns with lateral acetabular deficiency being constantly present 3: SubtypesĪcetabular dysplasia can be divided into different patterns concerning 3-D morphology. It may be also due to other hip pathologies that have occurred during childhood as septic arthritis, trauma or Legg-Calve-Perthes disease ref. EtiologyĪcetabular dysplasia might be the result of abnormal growth after treatment or missed developmental dysplasia of the hip during childhood, the etiology of which is multi-factorial in nature. This adds to cartilage and/or labral injury as well as damage to the joint capsule 2-4. ComplicationsĢ5-50% of patients with acetabular dysplasia will develop early hip osteoarthritis if left untreated 1-6.Īcetabular dysplasia is characterized by a smaller weight-bearing surface than the normal acetabulum, which ultimately leads to increased contact stress and static overload due to under-coverage of the femoral head and structural instability. Clinical signs include a positive hip impingement test 11 and/or anterior apprehension test. In addition, there may be limping or signs and symptoms of hip instability 11. Patients can present with hip pain or groin pain especially with extreme positions e.g. The clinical presentation of acetabular dysplasia has been described as variable 11. Risk factors for acetabular dysplasia include the following 2,3: Infantile developmental dysplasia of the hipįemoroacetabular impingement morphology in ~50%: more commonly cam than pincer morphology 12,13 AssociationsĪcetabular dysplasia is associated with the following conditions 2,3: Male sex is apparently associated with posterosuperior deficiency 3. EpidemiologyĪdult hip dysplasia has an estimated prevalence of 0.1% and is more common in women 2,3. Acetabular dysplasia is a form of developmental dysplasia of the hip (DDH) often referred to in the adolescent and adult population 1.
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