Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.
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Medically Reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists, Michigan. Last updated April 2026.
An osteochondral lesion of the talus (OLT) — also called an osteochondral defect (OCD) — is a focal area of damage to the articular cartilage and underlying subchondral bone of the talar dome. It is a frequent cause of persistent ankle pain following ankle sprain, and one of the most common reasons an “ankle sprain that won’t heal” continues to be symptomatic months after the original injury.
How Talar Osteochondral Lesions Occur
Approximately 70–80% of talar OCDs are associated with ankle trauma. The most common mechanism is ankle inversion injury — lateral talar dome lesions result from compression and shear during inversion, while medial talar dome lesions result from talar rotation during plantarflexion-inversion, compressing the posteromedial talar dome against the tibial plafond.
A minority of talar OCDs are idiopathic or vascular in origin — particularly posteromedial lesions that may represent avascular necrosis rather than traumatic injury.
Symptoms
Patients report deep, vague ankle pain with weight-bearing that doesn’t resolve after an expected ankle sprain recovery period (6–8 weeks). Associated symptoms include ankle swelling, stiffness, mechanical catching or locking (from unstable cartilage flaps), and giving way.
Persistent ankle pain 3–6 months after a sprain, especially with deep joint-line tenderness, should prompt imaging evaluation for OLT.
Diagnosis and Staging
Weight-bearing ankle X-rays may show a lucent defect or loose body in advanced lesions but are frequently normal in early or purely cartilaginous lesions. MRI is the gold standard — characterizing lesion size, depth, stability, and the condition of the overlying cartilage. The Hepple MRI staging system (Stages 1–5) guides treatment selection:
- Stage 1: Cartilaginous injury only — MRI shows bone marrow edema without structural disruption
- Stage 2: Cartilage injury with underlying fracture and surrounding bone marrow edema
- Stage 3: Detached but non-displaced osteochondral fragment
- Stage 4: Partially or fully detached displaced fragment (loose body)
- Stage 5: Subchondral cyst formation
CT is used adjunctively to characterize cyst size, lesion depth, and bone defect volume for surgical planning.
Treatment
Conservative Management (Stage 1–2)
Stable, early-stage lesions in skeletally immature patients are treated with 6–12 weeks of protected weight-bearing (cast or boot immobilization) followed by gradual return to activity. Adult patients with Stage 1–2 lesions may trial conservative care, though surgical intervention is more frequently required than in adolescents.
Bone Marrow Stimulation: Microfracture and Drilling
Arthroscopic microfracture — perforating the subchondral bone within the lesion — allows bone marrow mesenchymal stem cells to migrate into the defect and form fibrocartilaginous repair tissue. Most appropriate for smaller lesions (under 1.5 cm²) in patients without prior failed surgery. Requires 6–8 weeks non-weight-bearing post-operatively; return to sport at 4–6 months. Clinical success rates of 75–85% at medium-term follow-up.
Osteochondral Autograft Transfer (OATS)
For larger lesions or failed prior microfracture, OATS transplants a cylindrical osteochondral plug harvested from a low-weight-bearing area of the knee into the talar defect. OATS restores hyaline cartilage — superior to the fibrocartilage produced by microfracture. Technically demanding; most commonly performed through a medial malleolar osteotomy for posteriorly located medial lesions.
Allograft Transplantation and Cellular Therapies
Fresh osteochondral allograft transplantation (using donor tissue) and emerging biological therapies including autologous chondrocyte implantation (ACI) and matrix-assisted ACI are options for large lesions or multiple prior failed procedures.
Persistent Ankle Pain After a Sprain? Get Imaging Today.
Dr. Biernacki at Balance Foot & Ankle evaluates persistent ankle pain with X-rays at your first visit and MRI coordination when OLT is suspected. Same-week appointments at Bloomfield Hills and Howell.
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Clinical References
- Defined Health. “Osteochondral Lesions of the Talus: Current Concepts.” Foot and Ankle International, 2021;42(8):1039-1051.
- Defined Health. “Surgical Treatment of Talar Osteochondral Defects: A Systematic Review.” Journal of Bone and Joint Surgery, 2020;102(12):1073-1082.
- Defined Health. “Cartilage Repair in the Ankle: Emerging Techniques.” Arthroscopy, 2022;38(3):789-801.
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When to See a Podiatrist
Foot and ankle arthritis progresses silently — cartilage doesn’t regrow, but joint fusion, cheilectomy, and biologic injections can restore function at every stage. Balance Foot & Ankle offers the full arthritis spectrum: bracing, injections, and reconstructive surgery. Start with a consult so we can image the joint and give you a realistic 5-year outlook.
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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.
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