# Femoral Head Reduction Osteotomy for Legg-Calvé-Perthes Disease Sequelae: Case Report

## TL;DR

A new surgical technique called femoral head reduction osteotomy is used to treat hip joint issues caused by Legg-Calvé-Perthes disease, with promising short-term results.

## Contribution

A novel surgical technique for treating hip deformities from Legg-Calvé-Perthes disease is introduced and applied in a case report.

## Key findings

- Femoral head reduction osteotomy successfully removes damaged bone and restores femoral head sphericity.
- Short-term outcomes of the procedure are encouraging for patients with Legg-Calvé-Perthes disease sequelae.
- The lateral third of the femoral head remains intact and non-articulating in cases of Legg-Calvé-Perthes disease.

## Abstract

Legg-Calvé-Perthes disease (LCPD) commonly causes sequelae in the hip joint morphology. A common variant is an oversized, nonspherical femoral head, associated with a short femoral neck and elevated greater trochanter, which leads to femoroacetabular impingement (FAI). The innovative Ganz technique for surgical hip dislocation opened up new treatment possibilities for FAI, including LCPD sequelae, without increasing the risk of avascular necrosis of the femoral head. In the ellipsoid coxa magna resulting from LCPD, joint wear is more accentuated in the central portion of the femoral head; the lateral third remains intact as it does not articulate with the acetabulum. A femoral head reduction osteotomy technique developed for such cases resects the damaged portion of the femoral head and restores its sphericity. Short-term outcomes are encouraging. The present case report presents a patient with LCPD sequelae submitted to a femoral head reduction osteotomy.

A doença de Legg-Calvé-Perthes (DLCP) origina comumente sequelas na morfologia da articulação coxofemoral. Uma variante comum é a cabeça do fêmur não-esférica e sobredimensionada, associada a um colo femoral curto e grande trocânter elevado, que origina conflito femuroacetabular (CFA). A inovadora técnica de luxação cirúrgica do quadril de Ganz abriu novas possibilidades de tratamento para CFA, incluindo a originada por sequelas de DLCP, sem aumentar o risco de necrose avascular da cabeça femoral. Na coxa magna elipsoide resultante de DLCP, constatou-se que o desgaste articular era mais acentuado na porção central da cabeça do fêmur e que o terço lateral está íntegro, pois não articula com o acetábulo. Para estes casos, foi desenvolvida a técnica de osteotomia de redução da cabeça femoral, que resseca a porção danificada da cabeça femoral e restabelece a sua esfericidade. Os resultados a curto prazo são encorajadores. O presente relato de caso apresenta um paciente com sequelas de DLCP tratado com osteotomia de redução da cabeça femoral.