Beukes familial hip dysplasia

Hip dysplasia is an abnormality of the hip joint where the socket portion does not fully cover the ball portion, resulting in an increased risk for joint dislocation. Hip dysplasia may occur at birth or develop in early life. [Source: Wikipedia ]

Autosomal dominant premature degenerative osteoarthropathy of the hip
Familial hip dysplasia
OrphaNet reference
Hip dysplasia, Beukes type