Resplinting a Fibula Fracture with Complete Deltoid Ligament Tear
A fibular fracture with complete deltoid ligament tear represents an unstable ankle injury that requires urgent orthopedic consultation and should NOT be simply resplinted—this injury pattern demands surgical fixation to prevent chronic instability, post-traumatic arthritis, and poor functional outcomes.
Critical Recognition of Instability
The combination of fibular fracture and complete deltoid ligament disruption creates a bimalleolar equivalent injury with circumferential ankle instability. This is fundamentally different from an isolated fibular fracture:
- Medial clear space >5 mm indicates deep deltoid ligament disruption and predicts ankle instability 1
- Fibular fracture above the syndesmosis, combined with medial tenderness/swelling/bruising, signals high instability risk 2
- Weight-bearing radiographs (if tolerable) showing medial clear space ≥4 mm confirm instability 2
Immediate Management Algorithm
1. Initial Stabilization (NOT definitive treatment)
- Apply well-padded posterior splint with stirrups in neutral position
- Elevate and ice to minimize soft tissue swelling
- Avoid manipulation prior to definitive imaging unless neurovascular compromise exists 2
- Non-weight-bearing status mandatory
2. Imaging Protocol
- Standard three-view ankle radiographs (AP, lateral, mortise) 2
- Gravity stress views are more reliable than manual stress for detecting deltoid disruption in this injury pattern 2
- Consider dorsiflexion-external rotation stress radiographs—medial clear space ≥5 mm is most predictive of complete deltoid tear 1
3. Definitive Treatment Decision
This injury requires surgical intervention, not resplinting:
- Fibular fixation alone does NOT adequately restore stability when the deltoid is completely torn 3
- Recent biomechanical evidence shows fibular plate fixation primarily improves external rotation but fails to restore lateral translation, valgus, or internal rotation stability in complete deltoid injuries 3
- Selective deltoid ligament repair is independently associated with superior mid-term outcomes (adjusted OR 16.4 for poor outcome without repair) 4
Surgical Approach
When medial clear space remains 5-10 mm after fibular and syndesmotic fixation:
- Superficial deltoid repair using suture anchors in the medial malleolus is the most common technique 5
- Deep deltoid repair may require talar-based anchor fixation 5
- Combined approach restores circumferential stability and prevents progressive deformity 6
Critical Pitfalls to Avoid
- Do NOT treat this as a simple fibular fracture—the complete deltoid tear makes this unstable
- Do NOT rely on fibular fixation alone to restore medial stability 3
- Do NOT delay orthopedic referral—early surgical intervention (within 7-10 days) optimizes soft tissue handling
- Do NOT accept residual medial clear space widening—this predicts poor long-term function 4
Temporary Splinting Technique (Bridge to Surgery)
If immediate surgery is not feasible:
- Well-molded posterior splint extending from toes to below knee
- Incorporate medial and lateral stirrups for additional stability
- Ankle in neutral dorsiflexion (NOT plantarflexion, which increases medial space widening)
- Strict non-weight-bearing
- Urgent orthopedic consultation within 24-48 hours
The answer to "resplinting" this injury is that it should not be resplinted as definitive treatment—temporary immobilization serves only as a bridge to surgical stabilization. Attempting conservative management risks chronic instability, progressive valgus deformity, and post-traumatic arthritis 6, 4.