How Urgent Are Stable SCFEs? A Multisite Retrospective Study of Surgical Timing and Complications Among Patients With Stable Slipped Capital Femoral Epiphysis.

Background: Stable slipped capital femoral epiphysis (SCFE) is often considered semi-urgent, prompting admission for in situ screw fixation (ISF), which may increase the cost/burden of care. Avascular necrosis (AVN) affects 25% to 50% of patients with unstable SCFE, yet it is uncommon after stable SCFE. Among patients presenting with stable SCFE, little is known about the relationship between diagnosis and surgical timing with regard to slip progression or complications.

Methods: This retrospective observational study included all patients younger than 18 years with stable SCFE at initial diagnosis treated with ISF between 2000 and 2020 at 4 centers. Patients with Loder unstable SCFE at the time of initial SCFE diagnosis were excluded. Timing data included time from (1) symptom onset to diagnosis, (2) symptom onset to surgical team evaluation, (3) symptom onset to surgery, (4) diagnosis to surgical team evaluation, (5) surgical team evaluation to surgery, and (6) diagnosis to surgery. Regression analyses explored relationships between timing and slip progression to unstable, subsequent procedures, and complications as graded by the modified Clavien-Dindo-Sink system.

Results: A total of 298 patients with 362 stable SCFEs were included. The mean time from symptom onset to diagnosis was 134 days, from diagnosis to surgical team evaluation was 3.2 days, and from surgical team evaluation to surgery was 2.1 days. The mean follow-up was 2.4 years. Eighteen percent of hips were affected by a complication. Two patients initially diagnosed with stable SCFE progressed to unstable SCFE, having experienced falls after diagnosis and before orthopaedic evaluation; one of these went on to develop AVN. Time elapsed between symptom onset, diagnosis, surgical team evaluation, and surgery was not associated with the incidence or severity of complications or subsequent procedure.

Conclusions: The urgency of surgical treatment of stable SCFE does not appear to affect mid-term outcomes. If surgical management of stable SCFE is not performed urgently, it is critical to avoid weight bearing and falls to reduce progression to an unstable SCFE.

Level Of Evidence: Level III, therapeutic.