Open Access CRIS of the University of Bern
Long-term results of the modified Dunn procedure in slipped capital femoral epiphysis : a minimum of ten-year follow-up
By Alessandro Aprato, Andrea Audisio, Dr Samuele Grilli and 5 others.
Abstract
Aims
In situ fixation for slipped capital femoral epiphysis (SCFE) prevents further displacement, but fails to correct the proximal femoral deformity, which may lead to femoroacetabular impingement (FAI) and early osteoarthritis (OA). The modified Dunn procedure (MDP) restores proximal femoral anatomy with the aim of improving long-term joint preservation. However, evidence beyond mid-term follow-up remains limited. This study evaluates the ten-year survivorship, functional outcomes, and radiological correction following MDP.
Methods
A retrospective single-centre review was performed of patients treated with the MDP between 2007 and 2014 for stable or unstable SCFE of any severity. Patients with preoperative avascular necrosis (AVN) were excluded. Primary outcomes were ten-year survivorship free from conversion to total hip arthroplasty (THA) and from radiological OA progression (≥ 1 Tönnis grade). Secondary outcomes included patient-reported outcome measures, hip range of motion, clinical signs of FAI, and correction of the Southwick and α angles. Kaplan-Meier survival analyses were performed and stratified by slip severity.