Unstable Weber B Fractures: Cast vs Surgery

Study compares treatment approaches for a type of lateral malleolus fracture deemed unstable on stress testing

By
Julia Cipriano, MS, CMPP
February 25, 2026
3 min

Conexiant

Objective:

To compare functional outcomes of cast immobilization versus surgery in patients with unstable unimalleolar Weber B ankle fractures.

Approach:

Key Findings:

Mean OMAS was 89 for cast immobilization and 87 for surgery, meeting the noninferiority margin.
No significant differences in secondary outcomes between groups.
Surgical group had more treatment-related complications.

Interpretation:

Cast immobilization is as effective as surgery for unstable Weber B fractures, with fewer complications, supporting conservative treatment approaches.

Limitations:

Study limited to isolated Weber B fractures; results may not apply to other fracture types.
Follow-up was only 2 years; long-term outcomes are unknown.

Conclusion:

A standard below-the-knee cast provides adequate stabilization for isolated unimalleolar fibular fractures with congruent ankle mortise, suggesting a shift towards conservative management.