Osteochondral Lesion of the Talus: Bone Marrow Stimulation vs. ACI — Graft Selection

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

Osteochondral lesions of the talus (OLT) — focal defects of the talar articular cartilage and subchondral bone — affect approximately 50% of ankle sprains with fractures and represent a leading cause of chronic ankle pain in young active patients. Surgical management selection between bone marrow stimulation (microfracture), autologous chondrocyte implantation (ACI), osteochondral autograft transfer (OATS), and particulated juvenile articular cartilage (PJAC) depends on lesion size, depth, containment, and prior treatment history.

Lesion Classification and Imaging

MRI with cartilage-sensitive sequences (3D DESS or T2 mapping) characterizes lesion size, subchondral bone edema, cyst formation, and fragment stability. Lesion size is the primary determinant of treatment selection: lesions under 150 mm² (approximately 10–12 mm diameter) respond well to bone marrow stimulation; lesions 150–200 mm² represent a transitional zone; lesions over 200 mm² have significantly worse outcomes with microfracture and are better addressed with biological restorative techniques. CT scan quantifies subchondral cyst volume — cysts over 1 cm³ require bone grafting regardless of cartilage approach.

Bone Marrow Stimulation (Microfracture)

Microfracture — arthroscopic débridement of the unstable cartilage flap followed by creation of multiple 3–4 mm channels penetrating the subchondral bone to release marrow elements — produces fibrocartilage fill of the defect. Fibrocartilage (predominantly Type I collagen) is mechanically inferior to native hyaline cartilage (Type II collagen) but provides functional relief in 70–80% of patients at short-term follow-up. Outcomes deteriorate at 5+ years for larger defects as fibrocartilage undergoes progressive degeneration. Microfracture is the first-line approach for primary lesions under 150 mm² with intact shoulders and no significant subchondral cyst.

Autologous Chondrocyte Implantation (ACI)

ACI is a two-stage biological restorative procedure producing hyaline-like cartilage repair tissue. Stage 1: arthroscopic chondrocyte harvest from a non-weight-bearing area. Chondrocytes are expanded in culture for 6–8 weeks. Stage 2: implantation of cultured chondrocytes beneath a periosteal patch or collagen membrane (matrix-ACI/MACI) over the débrided defect. MACI (Vericel) is the FDA-approved matrix-ACI product. ACI produces superior long-term outcomes compared to microfracture for lesions over 150 mm²— studies show maintained functional improvement at 10+ years versus progressive deterioration with microfracture. ACI is the preferred approach for failed prior microfracture, large primary lesions, and athletically active patients under 50 years old.

OATS and Particulated Juvenile Cartilage

Osteochondral autograft transfer (OATS) harvests a cylindrical osteochondral plug from the ipsilateral knee (non-weight-bearing trochlear facet) and press-fits it into the talar defect — delivering viable hyaline cartilage with intact subchondral bone in a single-stage procedure. OATS is most appropriate for contained lesions under 150 mm² with significant subchondral bone loss where bone marrow stimulation alone is insufficient. Donor site morbidity (knee pain, condromalacia) is the primary limitation. Particulated juvenile articular cartilage (PJAC, DeNovo NT) uses allograft juvenile chondrocytes implanted in a fibrin glue matrix — single-stage, no donor site, with early outcomes comparable to MACI for medium-sized lesions.

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Ankle OLT Evaluation — Balance Foot & Ankle

Dr. Biernacki treats osteochondral lesions with arthroscopic bone marrow stimulation and biological restorative techniques. Serving Bloomfield Hills, Howell, and all of Michigan.

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Frequently Asked Questions

When should I see a podiatrist?

See a podiatrist for any foot or ankle pain that persists more than 2 weeks, doesn’t improve with rest, limits your daily activities, or is accompanied by swelling, numbness, or skin changes. People with diabetes or circulation problems should see a podiatrist regularly even without symptoms.

What does a podiatrist treat?

Podiatrists diagnose and treat all conditions of the foot, ankle, and lower leg including plantar fasciitis, bunions, hammertoes, toenail problems, heel pain, nerve pain, diabetic foot care, sports injuries, fractures, and foot deformities — both surgically and non-surgically.

What can I expect at my first podiatry visit?

Your first visit includes a full medical history, physical examination of your feet and gait, and in-office diagnostic imaging if needed (X-rays, ultrasound). We’ll discuss your diagnosis and create a personalized treatment plan. Most visits take 30–45 minutes.

Need Treatment at Balance Foot & Ankle?

Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin see patients at our Howell and Bloomfield Township offices.

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Most Common Mistake We See

The most common mistake we see is: Waiting too long before seeking care. Fix: any foot pain lasting more than 4 weeks, or any sudden severe symptom, deserves a professional evaluation rather than more rest.

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