Foot Compartment Fasciotomy: Surgical Incision Approach
For foot compartment syndrome requiring fasciotomy, use a combined approach with two dorsal longitudinal incisions plus one medial longitudinal incision to ensure complete decompression of all nine compartments, as this provides the most comprehensive and immediate pressure release.
Recommended Incision Technique
Primary Approach: Combined Dorsal and Medial Incisions
The optimal surgical approach requires multiple incisions to adequately decompress all foot compartments 1, 2, 3:
- Two dorsal longitudinal incisions are placed over the second and fourth metatarsals to access the interosseous and dorsal compartments 1, 3, 4
- One medial longitudinal incision is essential for decompressing the medial, superficial, lateral, and calcaneal compartments 2, 3, 4
Critical Technical Points
The medial approach must include incision of the flexor brevis compartment to achieve immediate pressure release in the central compartments 2. Experimental evidence demonstrates that:
- Medial fasciotomy with flexor brevis compartment release provides immediate pressure reduction in the central flexor space, tarsal tunnel, and intermetatarsal areas 2
- Dorsal fasciotomy alone is less effective for releasing pressure in the central flexor space and tarsal tunnel 2
- The double dorsal incision approach, while easier to perform, takes significantly longer to normalize compartment pressures (11 minutes versus 1 minute for medial approach) 1
Anatomical Considerations
All nine foot compartments communicate pressure increases simultaneously during compartment syndrome, requiring comprehensive decompression 2. The compartments include:
- Four interosseous compartments (accessed dorsally) 3, 4
- Medial, central, lateral, and superficial compartments (accessed medially) 3, 4
- Calcaneal compartment (requires special attention via medial approach) 4
Clinical Context and Timing
Immediate fasciotomy is indicated when compartment pressure exceeds 30 mmHg or when the difference between compartment pressure and diastolic blood pressure is less than 30 mmHg 3, 4. In the setting of acute limb ischemia with reperfusion injury:
- Patients with clinical evidence of compartment syndrome require immediate fasciotomy of all involved compartments 5
- Prophylactic fasciotomy is reasonable in threatened but salvageable limbs (category IIa or IIb) to avoid delayed diagnosis complications 5
- Early fasciotomy is associated with lower amputation rates and shorter hospitalization 5
Common Pitfalls to Avoid
Do not rely solely on dorsal incisions, as this approach inadequately decompresses the medial and central compartments 2. Key warnings include:
- Failure to decompress the calcaneal compartment can lead to persistent complications 4
- Inadequate release of the flexor brevis compartment results in incomplete central compartment decompression 2
- Single-incision techniques are insufficient for the complex anatomy of foot compartments 3, 6
Wound Management Post-Fasciotomy
If minimal tissue bulge is noted after fasciotomy, early delayed primary closure should be attempted with systemic diuresis and leg elevation 5. When delayed primary closure is not possible:
- Negative pressure wound therapy (NPWT) is effective for reducing discomfort and facilitating closure or preparing for skin grafting 5
- Diligent postacute wound care is essential to mitigate complications and achieve functional limb restoration 5
Evidence Limitations
Current evidence shows no definitive consensus on the optimal number or location of incisions 6, though existing data suggest that using two or more incisions may be associated with fewer long-term sequelae including contractures, deformity, weakness, and sensory neuropathy 3, 6. The threshold for performing fasciotomy must remain low given the severe consequences of untreated compartment syndrome 3, 4.