Epiphyseal Morphology Following Successful Modified Dunn Procedure for SCFE.

Area of Science:

• Orthopedic surgery
• Pediatric orthopedics
• Skeletal development

Background:

• The modified Dunn procedure is a key surgical treatment for slipped capital femoral epiphysis (SCFE), especially severe cases.
• Previous research has focused on complications and short-term outcomes, with limited data on long-term epiphyseal morphology post-treatment.

Purpose of the Study:

• To investigate the morphologic development of the upper femoral epiphysis after successful modified Dunn procedures.
• To assess the long-term sphericity of the femoral head following treatment for SCFE, excluding cases with osteonecrosis.

Main Methods:

• Retrospective analysis of 130 hips from 128 patients who underwent the modified Dunn procedure.
• Exclusion of patients with osteonecrosis or significant healing complications.
• Radiographic assessment of preoperative and postoperative images for slip angle, alpha angles, and Mose sphericity.

Main Results:

• At a mean follow-up of 30.1 months, 70.8% of epiphyses were aspherical based on the Mose scale.
• Female patients showed a higher likelihood of spherical epiphyses (P=0.007).
• No significant correlation was found between sphericity and patient age, chronicity, or Loder stability.

Conclusions:

• Even successful modified Dunn procedures for SCFE often result in non-spherical femoral epiphyses.
• Epiphyseal shape does not appear to improve over time, and joint space may narrow.
• Further research is needed to understand the long-term implications of these morphologic changes.