What Is a Calcaneal Osteotomy?

Osteotomy — literally “bone cutting” — is a surgical technique in which bone is precisely cut and repositioned to correct alignment or change mechanical forces. A calcaneal osteotomy specifically refers to cutting the calcaneus (heel bone) and repositioning it to improve foot alignment, redistribute forces, or correct deformity. It is a powerful tool in foot and ankle surgery because the calcaneus is the foundational bone of the hindfoot — its position directly determines the alignment of the entire foot below the ankle.

Calcaneal osteotomies are performed as components of larger reconstructive procedures (such as flatfoot reconstruction or cavovarus correction) or as isolated procedures when specific heel position correction is the primary goal. Understanding the rationale and types of calcaneal osteotomy helps patients ask informed questions when this procedure is recommended as part of their surgical plan.

Why Heel Position Matters So Much

In normal alignment, the heel bone sits in a neutral or slight valgus (outward) position — typically 2–6 degrees of valgus when observed from behind. This alignment ensures that weight is distributed appropriately across the hindfoot, that the plantar soft tissues are optimally positioned, and that the mechanical axis of the leg passes through the center of the ankle and heel.

When the heel drifts significantly into valgus (flatfoot deformity) or into varus (high-arched/cavovarus deformity), the entire mechanical environment of the foot changes: tendons are stressed at suboptimal angles, joints are loaded asymmetrically, and adjacent structures compensate in ways that create secondary problems. Correcting heel position through osteotomy rebalances these forces and creates a better mechanical environment for the long-term health of all foot structures.

Types of Calcaneal Osteotomy

Medializing calcaneal osteotomy (MCO): The most common type, performed for flatfoot deformity and valgus heel. The calcaneus is cut horizontally across the body, and the posterior segment (the heel itself) is shifted medially (inward) by approximately 8–10mm. This shifts the ground contact of the heel from lateral to medial, restoring a more neutral heel position and redistributing Achilles tendon force more efficiently. The MCO is a core component of most adult-acquired flatfoot reconstructions, typically combined with posterior tibial tendon reconstruction and spring ligament repair.

Lateralizing calcaneal osteotomy: The opposite of the MCO — the posterior calcaneus is shifted laterally (outward). This is used for hindfoot varus (high-arched foot, cavovarus deformity) to shift the heel away from an excessively varus position. It is typically combined with other procedures (peroneal tendon transfer, plantar fascia release, metatarsal osteotomies) as part of cavovarus correction.

Dwyer osteotomy: A closing wedge osteotomy of the calcaneus — a wedge of bone is removed from the lateral calcaneal wall to correct hindfoot varus directly by angulating the posterior calcaneal segment. This is useful when both translational and angular correction are needed for significant varus deformity.

Evans osteotomy (lateral column lengthening): Rather than translating the posterior calcaneus, the Evans procedure makes a cut in the calcaneus anterior to the subtalar joint and opens the cut with a structural bone graft, thereby lengthening the lateral column of the foot. This reduces forefoot abduction (the outward splaying of the forefoot common in flatfoot) and is often combined with MCO for complete flatfoot reconstruction in appropriate patients.

Z-osteotomy: A modification that provides both translational and rotational correction in a single cut, allowing more dimensional correction of complex deformities.

Fixation and Healing

Calcaneal osteotomies are typically fixed with large-diameter screws (often 6.5 or 7.0mm cannulated screws) that stabilize the repositioned bone segment while healing occurs. The calcaneus has excellent blood supply and is predominantly cancellous (spongy) bone, which facilitates reliable healing. Healing of the osteotomy typically occurs within 6–8 weeks, confirmed by X-ray. Hardware removal is not routinely performed unless screws become symptomatic.

Recovery Timeline

Calcaneal osteotomy requires strict non-weight-bearing for the first 6 weeks while the cut bone heals — this is the most challenging phase of recovery. A splint is placed initially, transitioning to a boot as swelling reduces. After confirmed radiographic healing at 6–8 weeks, progressive weight-bearing in a boot begins, followed by transition to footwear with orthotics at approximately 10–12 weeks. Physical therapy for strength and gait retraining begins in the boot phase. Full return to comfortable walking typically occurs by 3–4 months; return to higher-demand activities at 4–6 months. Final result assessment at 12 months, when all swelling and remodeling is complete.

Outcomes and Expectations

Outcomes from calcaneal osteotomy as part of a well-planned reconstructive procedure are generally good, with significant improvement in pain and function in the majority of patients. The calcaneal osteotomy component of flatfoot reconstruction has been shown to improve hindfoot alignment, reduce posterior tibial tendon stress, and provide durable correction when proper candidate selection and surgical technique are applied. Setting realistic expectations — that reconstructed feet rarely feel “normal” but do achieve significant functional improvement — is an important part of pre-operative counseling.

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Dr. Tom Biernacki, DPM

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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.