Freiberg’s Infraction Metatarsal AVN 2026 | DPM

Freiberg’s Infraction: Smillie Classification and Treatment by Stage

Freiberg’s infraction (osteochondrosis of the metatarsal head) is avascular necrosis of a metatarsal head — most commonly the 2nd (68%), followed by 3rd (27%), and rarely the 4th or 5th. It is the only osteochondrosis occurring in the foot, predominantly affecting adolescent females (3:1 female predominance) during rapid growth phases. The Smillie classification (Stages I-V) defines the disease progression from subtle subchondral stress fracture to complete metatarsal head collapse and joint arthrosis, and directly guides treatment — early stages are managed conservatively while late stages (IV-V) frequently require surgery.

Smillie Stage	Pathology	Imaging Finding	Treatment	Expected Outcome
Stage I — Ischemia	Subchondral ischemia and trabecular necrosis without structural collapse; articular cartilage intact; earliest detectable stage; X-ray often normal at this stage	X-ray: normal or subtle subchondral lucency; MRI: low T1 signal in MT head (necrosis replacing normal marrow fat); bone marrow edema on STIR; articular cartilage intact; US: joint effusion	Non-weight-bearing (NWB) in walking boot × 4-6 weeks; offloading orthotic with metatarsal pad proximal to MT head; activity restriction; NSAIDs; monthly X-ray monitoring; goal: prevent progression to collapse	EXCELLENT with early treatment — healing without deformity possible at Stage I; aggressive offloading gives the vascular supply chance to reconstitute before structural collapse occurs; most Stage I patients treated aggressively do not progress to Stage III+
Stage II — Slight central depression	Beginning of articular surface depression centrally; plantar cortex still intact; minor subchondral collapse; joint space maintained; dorsal aspect of MT head remains rounded	X-ray: central subchondral density change; early central flattening of MT head; metatarsal head appears slightly sclerotic; MRI confirms extent of necrosis; CT: subtle articular surface irregularity	NWB or protective weight-bearing × 6-8 weeks; metatarsal bar or dancer’s pad; rocker-bottom shoe; custom orthotic with built-in MT head offloading; consider bone stimulation (PEMF); conservative treatment most effective at Stage II if initiated promptly	GOOD — most Stage II patients stabilize with aggressive conservative treatment; some progress to Stage III despite treatment; 60-70% avoid surgery with consistent Stage II offloading; reassess with X-ray every 6-8 weeks
Stage III — Plantar bone intact, central resorption	Central resorption of MT head with central collapse; plantar cortex and metatarsal neck still intact; articular cartilage partially preserved peripherally; joint space reduced centrally	X-ray: central depression with peripheral MT head remaining intact; “moth-eaten” or cystic appearance centrally; MT head deformed but not collapsed; MRI: extensive necrosis with partial cartilage preservation	Stage III: conservative for adolescents (may remodel during growth); dorsiflexion osteotomy of MT head for young active patients (rotates necrotic weight-bearing surface dorsally, bringing healthy plantar cartilage into the weight-bearing zone); joint debridement arthroscopically for partial symptom relief; continue offloading orthotic	VARIABLE — adolescents have some remodeling capacity; adults at Stage III have limited conservative success; dorsiflexion osteotomy: 75-80% good results at 5 years in appropriate candidates; may delay but not prevent eventual joint arthrosis
Stage IV — Plantar cortex fracture, loose bodies	Plantar cortex fracture with loose osteochondral bodies within the joint; significant articular surface disruption; joint space irregularity; possible synovitis from loose bodies	X-ray: clearly collapsed MT head; loose bodies within joint space; plantar cortex discontinuity; MT head significantly deformed; MRI or CT confirms loose bodies and remaining articular surface	Surgical: joint debridement + loose body removal (arthroscopic or open); dorsiflexion osteotomy if sufficient articular surface remains; if articular surface severely compromised: partial metatarsal head resection (salvage); joint-preserving surgery preferred if possible	GUARDED — Stage IV has already sustained significant joint damage; debridement + osteotomy: 60-70% improvement but joint arthrosis likely long-term; resection arthroplasty: reliable pain relief but alters biomechanics; transfer metatarsalgia common after resection
Stage V — Complete collapse, arthrosis	Complete metatarsal head collapse with flattening and deformity; joint arthrosis established; joint space severely narrowed or absent; periarticular osteophytes; worst stage — end-stage Freiberg’s	X-ray: completely deformed MT head; severe joint space narrowing; periarticular osteophytes; MT head unrecognizable from original anatomy; arthrosis pattern identical to other end-stage joint arthritis	Conservative: stiff-soled shoe with MT bar to offload; custom orthosis; pain management; cortisone injection for acute flares; Surgical: metatarsal head resection or Weil osteotomy (shortening to decompress joint); 2nd MTP joint fusion for intractable Stage V pain; silicone implant arthroplasty (controversial); total MTP joint replacement (limited evidence)	SALVAGE — Stage V outcomes depend on procedure; resection: reliable pain relief, altered biomechanics, transfer metatarsalgia risk; Weil osteotomy: 60-65% improvement if joint space remains; arthroplasty: limited long-term data in foot MTP; most patients reach functional activity level with appropriate surgery

2nd MTP Joint Pain Differential: Freiberg’s vs Capsulitis vs Morton’s Neuroma vs Stress Fracture

Condition	Peak Age / Demographics	Location of Pain	Key Clinical Test	Imaging Finding	Treatment Direction
Freiberg’s Infraction	Adolescent and young adult females (12-25); peak onset 13-16 years; rarely adult-onset (idiopathic or post-traumatic)	Dorsal and plantar 2nd (or 3rd) MT head; directly over MT head; worsens with push-off; swelling over dorsal MT head	Dorsal MT head palpation reproduces pain; passive 2nd MTP dorsiflexion = painful; MT head may feel irregular or flattened	X-ray (early normal → late MT head collapse and deformity); MRI: subchondral T1 low signal, edema; CT: articular surface detail; progression visible on serial X-rays	Offloading orthotic; NWB for Stage I-II; surgical osteotomy for Stage III-IV; metatarsal head resection Stage V
2nd MTP Capsulitis (predislocation syndrome)	Middle-aged adults (40-60); women; patients with hallux valgus or long 2nd ray	Plantar 2nd MTP joint; direct plantar tenderness under MT head; may have “floating toe” (toe begins to dorsally sublux); pain with direct plantar palpation	Plantar drawer test: grip 2nd proximal phalanx and translate dorsally — excessive dorsal translation = plantar plate disruption (positive test); vertical stress on digit reproduces pain	MRI: plantar plate tear or attenuation at proximal phalanx insertion; T2 signal change within plantar plate; no MT head structural change (distinguishes from Freiberg’s — MT head normal in capsulitis)	Metatarsal pad proximal to MT head; taping to plantarflex 2nd digit; corticosteroid injection; Weil osteotomy + plantar plate repair for progressive dislocation
Morton’s Neuroma (2nd space)	Middle-aged adults (40-60); women; associated with narrow shoes	Interdigital space (between 2nd-3rd toes, or 3rd-4th space more common); “burning” or “shooting” into toes; radiates INTO the affected toes (neurogenic pattern)	Mulder’s click (compress MT heads while dorsiflexing toes — clicking sensation = positive); web space tenderness (not MT head tenderness); lateral MT compression reproduces interdigital pain	MRI: hypoechoic mass in intermetatarsal space; MRI T1 intermediate signal nodule; US most sensitive (4+mm nodule in web space); NO MT head structural change	Wide shoes + metatarsal pad; corticosteroid injection series (3 injections); alcohol sclerosing; surgical excision if >8mm or injection-refractory
2nd Metatarsal Stress Fracture	Runners, dancers, military recruits; any age with abrupt activity increase; 2nd MT most common metatarsal stress fracture (45-50% of metatarsal stress fractures)	Dorsal 2nd MT SHAFT pain (not head); localized to mid-shaft or neck; focal tenderness along shaft with “march fracture test” (palpate along dorsal shaft — point tenderness at fracture site)	Percussion test (tap distal toe — transmits pain to fracture site); fulcrum test (gently bend MT over examiner’s hand — pain at fracture); hop test (single-leg hop on involved side — painful)	X-ray: often normal in first 2-3 weeks; periosteal reaction at 2-4 weeks; fracture line visible at 4-6 weeks; MRI: periosteal edema and fracture line immediately; most sensitive for early stress fracture	Offloading boot × 4-6 weeks; activity restriction; return to running at 6-8 weeks; address training errors; calcium/vitamin D supplementation

Quick answer: Friebergs Infraction Metatarsal Head Avascular Necrosis Michigan Podiatrist is a common foot/ankle topic that affects many patients. The 2026 evidence-based approach combines proper diagnosis, conservative-first treatment, and escalation only when needed. We treat this regularly at our Howell and Bloomfield Hills practices. Call (810) 206-1402.

Freiberg’s infraction is a form of avascular necrosis — bone death caused by disrupted blood supply — that specifically affects the head of a metatarsal bone in the forefoot. While any metatarsal can be affected, the second metatarsal head is involved in over 60% of cases. First described in 1914 by Alfred Freiberg, this condition predominantly affects adolescent girls and young women, though it can occur at any age. Balance Foot and Ankle in Howell, MI is equipped to diagnose and treat this rare but debilitating forefoot condition.

Causes and Risk Factors

The exact cause of Freiberg’s infraction is not fully understood, but repetitive microtrauma to the metatarsal head — combined with an inherent vulnerability of the local blood supply — is the prevailing theory. The second metatarsal is longest in many patients, making it the most common site of impact stress. High-heeled shoe wear, which concentrates forefoot loading, is a recognized risk factor. Growth plates in adolescents may be particularly vulnerable during rapid growth spurts. Anatomic factors like hypermobility of the first ray (which transfers load to the second metatarsal) and metatarsus primus elevatus (elevated first metatarsal) are common biomechanical contributors.

Staging and Symptoms

Freiberg’s infraction is classified in five Smillie stages from early subchondral fracture (Stage I) to complete joint collapse with loose bodies (Stage V). Early stages present as a vague aching in the forefoot that worsens with activity and barefoot walking on hard surfaces. Swelling over the affected metatarsal head is often visible. Advanced stages produce a palpable bony irregularity at the metatarsal head, limited and painful range of motion at the second metatarsophalangeal (MTP) joint, and sometimes a visible lump from loose osteochondral fragments.

Diagnosis

Weight-bearing X-rays show characteristic flattening and sclerosis of the metatarsal head in intermediate to advanced stages; early disease may be X-ray negative. MRI is the gold standard for early diagnosis, revealing subchondral bone marrow edema and early articular cartilage damage before structural collapse occurs. Dr. Biernacki evaluates all suspected Freiberg’s cases with both imaging modalities and a detailed biomechanical examination to identify contributing factors.

Treatment at Balance Foot and Ankle

Early stage Freiberg’s (Smillie I-II) responds well to conservative management: a metatarsal pad placed just proximal to the affected metatarsal head to offload it, a rigid-soled shoe or cam boot to reduce forefoot bending, and activity modification. Custom orthotics with a metatarsal bar can maintain long-term pressure redistribution. For advanced stages (Smillie III-V) with joint collapse, loose bodies, or osteophyte formation, surgical intervention is typically required. Options include joint debridement and loose body removal, dorsiflexion osteotomy to rotate the healthy plantar cartilage to the weight-bearing surface, and in severe cases joint resurfacing or interposition arthroplasty.

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Frequently Asked Questions

When should I see a podiatrist?

If symptoms persist past 2 weeks, affect your normal activity, or are accompanied by red-flag symptoms (warmth, redness, swelling, inability to bear weight).

What does treatment cost?

Most diagnostic visits and conservative treatments are covered by Medicare and major insurers. Out-of-pocket costs vary by your specific plan.

How quickly can I get an appointment?

Most non-urgent cases see us within 5 business days. Urgent cases (sudden pain, possible fracture) typically same or next business day.

What is Metatarsalgia?

Metatarsalgia is a common foot/ankle condition that affects mobility and quality of life. Understanding the underlying cause is the first step in successful treatment. Our podiatrists at Balance Foot & Ankle perform a hands-on biomechanical exam, review your activity history, and use diagnostic imaging when appropriate to identify the root cause—not just treat the symptom. Many patients have been told to “rest and ice” without a deeper diagnostic workup; our approach is different.

Symptoms and warning signs

Common signs of metatarsalgia include pain that worsens with activity, morning stiffness, swelling, tenderness when palpated, and difficulty bearing weight. If you experience sudden severe pain, inability to walk, visible deformity, numbness or color change, contact our office the same day or visit urgent care—these can signal a more serious injury such as a fracture, tendon rupture, or vascular compromise. Diabetics with any foot wound should seek same-day care.

Conservative treatment options

Most cases of metatarsalgia respond to non-surgical care: structured rest, supportive footwear changes, custom orthotics, targeted stretching and strengthening protocols, anti-inflammatory medications when medically appropriate, and in-office procedures such as ultrasound-guided injections. We also offer advanced therapies including MLS laser therapy, EPAT/shockwave, regenerative injections, and image-guided procedures. Treatment is sequenced from least invasive to most invasive, and we explain the rationale at every step.

When is surgery considered?

Surgery is reserved for cases that fail 3-6 months of well-structured conservative care, when there is structural pathology (severe deformity, complete tear, advanced arthritis), or when imaging shows damage that will not heal without intervention. Our surgeons have performed 3,000+ foot and ankle procedures and prioritize minimally-invasive techniques whenever appropriate. We discuss recovery timelines, return-to-activity milestones, and realistic outcome expectations before any procedure is scheduled.

Recovery timeline and prevention

Recovery from metatarsalgia varies based on severity and chosen treatment path. Conservative cases often improve within 4-8 weeks with consistent adherence to the protocol. Post-procedural recovery may range from a few days (in-office procedures) to several months (reconstructive surgery). Long-term prevention involves footwear assessment, activity modification, structured strengthening, and regular check-ins with your podiatrist if you have a history of recurrence. We provide written home-exercise plans and digital follow-up support.

In-Office Treatment at Balance Foot & Ankle

If home treatment isn’t providing relief for your metatarsalgia, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.