Inverted Acetabular Labrum: An Analysis of Tissue Embedment in Hip Joint in 15 Patients with Developmental Dysplasia of the Hip

introDuCtion The acetabular labrum is a triangular fibrocartilaginous structure that forms a horseshoe‐shaped attachment to the acetabular rim, which connects the acetabulum to the underlying transverse acetabular ligament [Figure 1a].[1] Up to 90% of symptomatic patients with developmental dysplasia of the hip (DDH) are found to combine with lesions of acetabular labrum.[2] The most common presentations of the acetabular labrum lesions are hypertrophy, laceration, and/or cyst formation.[3,4] Nevertheless, a unique hip joint condition is observed recently in several symptomatic DDH patients [Figure 1b]. A layer of abnormal disk‐shaped soft tissue embedded in the acetabulum. The outer layer was connected to the acetabular labrum, whereas the inner layer could be lifted and separated from the acetabular cartilage by surgical probe.