[Translated article] Total hip arthroplasty with shelf acetabuloplasty in dysplastic coxarthrosis, mean follow-up of 7 years

Developmental dysplasia of the hip is the cause of approximately one third of secondary coxarthrosis. Anatomy alterations make it difficult to place a total hip prosthesis in its anatomical position and for it to be stable in the long term; there are several techniques to achieve this goal. In the present work, we used autograft of the femoral head (shelf graft or reinforced roof), to improve the coverage of the acetabular component with favourable results. Sixteen cases were included in 14 patients with a diagnosis of developmental dysplasia of the hip (13 women and one man), the mean age was 44.3 years (range 35–68 years), with a mean follow-up of 7 years (range 1–15 years). All the cases were evaluated clinically and radiographically, to demonstrate the osseointegration of the graft and the functional results in the medium term. All the acetabular components were placed in anatomical position (Ranawat technique), the mean percentage of host bone coverage was 54.53% (range 43.28–79.05%), obtaining additional coverage with the bone graft of 45.13%. Osseointegration of the graft of 100% at 12 weeks, resorption of the graft from the sixth month, stabilising in the third postoperative year. Only one case of dislocation is reported, no cases of infection, loosening, heterotopic ossification or revision. This procedure has shown good functional results in the medium term with 100% osseointegration, despite cases of severe bone resorption of the graft that does not compromise the stability of the prosthesis. Introducción La displasia del desarrollo de cadera es causante de aproximadamente un tercio de las coxartrosis secundarias. Las alteraciones de la anatomía dificultan la colocación de prótesis total de cadera en su posición anatómica, y que la misma sea estable a largo plazo; hay varias técnicas para lograr ese objetivo. En el presente trabajo utilizamos autoinjerto de la cabeza femoral (shelf graft o techo armado), para mejorar la cobertura del componente acetabular con resultados favorables. Materiales y métodos Se incluyeron 16 casos en 14 pacientes con diagnóstico de displasia del desarrollo de cadera (13 mujeres y un varón), la edad media fue de 44,3 años (rango: 35-68 años), con un seguimiento medio de 7 años (rango: 1-15 años). Todos los casos fueron valorados clínica y radiográficamente, para demostrar la osteointegración del injerto y los resultados funcionales a mediano plazo. Todos los componentes acetabulares se colocaron en posición anatómica (