Evolution of Calcaneal Osteotomy Technique

Calcaneal osteotomy — surgical repositioning of the heel bone for flatfoot correction — has been performed through traditional open incisions for decades. The standard approach requires a 4–6 cm lateral incision, dissection through multiple tissue layers, and direct visualization of the calcaneus to perform the bone cut and apply fixation hardware.

Minimally invasive calcaneal osteotomy (MICA, or percutaneous calcaneal osteotomy) achieves the same bone correction through stab incisions of 5–10mm, using a high-speed burr guided by fluoroscopy (live X-ray imaging) rather than direct visualization. This evolution in technique, developed and refined primarily over the past decade, offers potential advantages over open surgery in appropriate patients.

Technical Principles

MICA uses the same bone cut geometry as open medializing calcaneal osteotomy — a diagonal cut through the posterior calcaneal body that allows the posterior fragment to slide medially. However, rather than a saw cut through an open wound, the osteotomy is created with a specially designed Shannon burr introduced through a small stab incision. The burr is visualized under biplanar fluoroscopy, allowing the surgeon to confirm the cut trajectory without direct visualization.

Once the osteotomy is complete, manual pressure shifts the posterior fragment to the desired medial position, which is confirmed fluoroscopically. Fixation is applied percutaneously (through the skin) using one or two cannulated screws — the same fixation method used in open osteotomy, but inserted through separate small stab incisions rather than the open wound.

Potential Advantages

• Smaller incisions: Stab incisions vs. 4–6 cm incision reduce visible scarring
• Reduced wound complications: Smaller wounds have lower rates of dehiscence, infection, and scar irritation
• Less soft tissue trauma: Minimizing dissection through muscle and fat reduces postoperative pain and swelling
• Potentially faster recovery: Several series report faster progression through weight-bearing milestones compared to open technique
• Outpatient procedure: Both open and MICA are outpatient, but MICA patients may mobilize more comfortably in the early post-operative period

Limitations and Considerations

MICA is technically more demanding than open osteotomy — the absence of direct visualization means the surgeon relies entirely on fluoroscopic imaging for guidance. The learning curve is steep, and early series in surgeons new to the technique report higher rates of incomplete or malpositioned osteotomies. Experienced minimally invasive foot surgeons with high MICA volumes achieve equivalent correction accuracy and outcomes to open techniques.

MICA is most appropriate for isolated calcaneal osteotomy. When performed as part of comprehensive flatfoot reconstruction requiring simultaneous spring ligament repair and FDL transfer, a combined approach using small MICA incisions plus medial soft tissue approaches is used — the MIS advantage is greatest for the lateral calcaneal component.

Recovery

Recovery from MICA follows the same general framework as open calcaneal osteotomy: 4–6 weeks non-weight-bearing, progressive weight-bearing in a boot from weeks 6–10, transition to shoes at 10–14 weeks. Some surgeons report allowing earlier weight-bearing at 2–3 weeks in MICA patients compared to open procedures, though this varies by surgeon preference and patient-specific factors.

Selecting the Right Approach

For patients considering calcaneal osteotomy for flatfoot, the decision between open and minimally invasive technique should be based on surgeon experience with MICA and the complexity of the overall reconstruction needed — not patient preference alone. An experienced MIS foot surgeon who performs MICA regularly is the appropriate choice for this approach; the technique’s advantages are only realized in high-volume hands.

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Dr. Tom Biernacki, DPM

Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.