Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

Supramalleolar osteotomy (SMO) is a joint-preserving surgical procedure that corrects abnormal alignment of the ankle by cutting and repositioning the tibia just above the ankle joint. By redistributing forces across the tibiotalar joint, SMO slows cartilage deterioration and delays or eliminates the need for ankle fusion or total ankle replacement in appropriately selected patients.

Understanding Ankle Alignment and Arthritis Progression

Normal ankle mechanics require the tibiotalar joint to bear load symmetrically across its full articular surface. When the ankle is in varus (the heel tilts inward) or valgus (the heel tilts outward), load concentrates on the medial or lateral talar dome respectively. This focal overloading accelerates cartilage wear, creating a predictable pattern of asymmetric tibiotalar arthritis.

Unlike total ankle replacement or fusion — which address end-stage arthritis — supramalleolar osteotomy addresses the underlying malalignment before irreversible cartilage loss occurs. In patients with asymmetric early-to-moderate arthritis and a correctable deformity, SMO can restore near-normal force distribution and provide substantial pain relief with preservation of ankle motion.

Varus vs. Valgus Ankle Deformity: Different Corrections

Varus Ankle (Medial Overload Pattern)

Varus ankle deformity — commonly associated with cavovarus foot, prior malunited ankle fracture, or peroneal muscle dysfunction — overloads the medial talar dome. SMO for varus deformity typically involves a medial opening wedge or lateral closing wedge osteotomy above the ankle to shift the mechanical axis laterally and redistribute load to healthier lateral cartilage.

Valgus Ankle (Lateral Overload Pattern)

Valgus ankle deformity arises from adult-acquired flatfoot (posterior tibial tendon dysfunction), prior fracture malunion, or ligamentous hyperlaxity. SMO for valgus deformity uses a lateral opening or medial closing wedge to correct coronal plane alignment and shift load medially.

Patient Selection for Supramalleolar Osteotomy

Ideal candidates for SMO have asymmetric tibiotalar arthritis with preserved cartilage on one side of the joint, a correctable coronal plane deformity at the supramalleolar level, adequate bone quality for osteotomy healing, and realistic expectations about recovery. Patients with pan-talar arthritis, large cystic deformities, or failed prior realignment procedures are generally better served by ankle fusion or replacement.

Preoperative evaluation includes standing long-leg alignment films to measure the mechanical axis deviation, weight-bearing CT scan to assess cartilage distribution and assess for subtalar arthritis, and MRI to evaluate remaining cartilage viability. Intraoperative stress examination under fluoroscopy helps determine the optimal correction magnitude.

Surgical Technique and Fixation

SMO is performed through an incision over the distal tibia. After precise osteotomy cut with fluoroscopic guidance, the tibia is repositioned to achieve the planned correction. Fixation with locking plates and screws maintains correction during healing. In some cases, concomitant procedures — fibular osteotomy, calcaneal osteotomy, ligament reconstruction, or subtalar fusion — are performed simultaneously to address contributing deformities at adjacent levels.

The correction magnitude is calculated preoperatively to shift the mechanical axis to the center or slightly lateral of the tibiotalar joint for varus deformity, or to the center for valgus deformity.

Recovery and Outcomes After SMO

Recovery follows a predictable course: non-weight-bearing for 6–8 weeks until osteotomy healing is confirmed radiographically, then progressive weight-bearing in a boot over 4–6 weeks, followed by physical therapy for range of motion and strength restoration. Return to full activity typically requires 4–6 months.

Published outcomes for SMO show good-to-excellent results in 75–85% of appropriately selected patients, with pain improvement sustained at 5–10 year follow-up. Importantly, patients who subsequently require ankle fusion or replacement after SMO achieve equivalent outcomes to primary fusion or replacement — the osteotomy does not compromise future surgical options.

SMO at Balance Foot & Ankle

Dr. Biernacki at Balance Foot & Ankle evaluates ankle malalignment with standing alignment radiographs and weight-bearing CT at our Bloomfield Hills and Howell offices. For patients with asymmetric ankle arthritis and correctable deformity, joint-preserving options including supramalleolar osteotomy are discussed as alternatives to fusion or replacement. Call (810) 206-1402 for a consultation.

Supramalleolar Osteotomy — Ankle Alignment Correction

Ankle malalignment from fracture malunion or progressive deformity accelerates arthritis. Our podiatric surgeons perform supramalleolar osteotomy to realign the ankle joint, redistribute weight-bearing forces, and delay or prevent the need for ankle replacement or fusion.

View Our Surgical Treatment Options | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Stamatis ED, et al. Supramalleolar osteotomy for the treatment of ankle osteoarthritis. Foot & Ankle International. 2003;24(10):754-764.
2. Colin F, et al. Supramalleolar osteotomy: techniques, indications, outcomes. Foot and Ankle Clinics. 2013;18(3):481-498.
3. Knupp M, et al. Supramalleolar osteotomy for realignment of the hindfoot. Techniques in Foot & Ankle Surgery. 2009;8(2):88-95.

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.