title: Secondary avascular necrosis after treatment for congenital dislocation of the hip.
abstract: We made a radiographic study of 104 unilateral congenital dislocations of the hip (CDH) that had an average age of 12 months (range 4-24), were treated with the same therapeutic protocol, and had an average six years follow-up (range 3-13). Radiographic changes were evident in the proximal femoral epiphysis in 57 hips (55%). In 7 (7%) the changes consisted of central osteoporosis with a cystic aspect, without metaphyseal or physeal changes, and had a normal end result without sequelae. This group was classified as type I. Fifty hips (48%) that were type II showed epiphyseal changes consisting of trabecular rarefaction with osteoporosis and irregular sclerosis, followed by a decrease of epiphyseal height and trabecular recovery. Forty-two hips (40%) were type IIA, with < 75% decrease in epiphyseal height with respect to the healthy side; five of these had a normal evolution, 35 had coxa magna and/or decrease of epiphyseal height, and only two cases had physeal lesion. In type IIB, hips, with > 75% decrease of epiphyseal height, 8 cases (8%) had a final physeal lesion.
authors.affiliation: Servicio de Ortopedia Infantil, Hospital Ramon y Cajal, Madrid, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Burgos
authors.forename: P
authors.initials: P
authors.lastname: Gonzalez-Herranz
authors.forename: G
authors.initials: G
authors.lastname: Ocete
authors.forename: J M
authors.initials: JM
authors.lastname: Rapariz
mesh_terms: D002648:Child; D002675:Child, Preschool; D005260:Female; D005271:Femur Head Necrosis / Q000000981:diagnostic imaging / Q000209:etiology*; D006618:Hip Dislocation, Congenital / Q000150:complications* / Q000000981:diagnostic imaging / Q000628:therapy*; D006801:Humans; D007223:Infant; D007873:Legg-Calve-Perthes Disease / Q000000981:diagnostic imaging / Q000209:etiology; D008297:Male; D010024:Osteoporosis / Q000000981:diagnostic imaging / Q000209:etiology; D011859:Radiography