Brachymetatarsia 
​Overview
Brachymetatarsia is a rare congenital or acquired condition in which one of the metatarsal bones of the foot is abnormally short.
This shortening causes misalignment of the forefoot and can lead to cosmetic concerns, altered biomechanics, callus formation, pain, and difficulty with footwear.
The fourth metatarsal is most frequently affected, although any metatarsal can be involved.
Brachymetatarsia is more common in females and may present as an isolated condition or as part of systemic or genetic disorders.


Etiology (Causes)
Brachymetatarsia results when the growth plate (physis) of a metatarsal closes prematurely, leading to early cessation of longitudinal growth.
Primary (Congenital) Causes
  • Idiopathic premature closure of the metatarsal growth plate (most common).
  • Associated congenital syndromes: Down syndrome, Turner syndrome, Albright’s hereditary osteodystrophy, pseudohypoparathyroidism.
  • Familial or sporadic inheritance patterns.
Secondary (Acquired) Causes
  • Trauma to the growth plate during childhood.
  • Infection (osteomyelitis) affecting the physis.
  • Radiation exposure or iatrogenic damage from childhood foot surgery.
  • Metabolic or endocrine disorders affecting bone growth.
The condition may be unilateral or bilateral and is frequently discovered during late childhood or early adolescence when the foot stops growing.


Clinical Presentation and Diagnosis
Symptoms
  • Visible shortening of one or more toes.
  • Dorsal displacement of the affected toe (“floating toe” appearance).
  • Forefoot pain or pressure points when walking or wearing shoes.
  • Calluses or metatarsalgia due to altered weight distribution.
  • Psychological or cosmetic concerns, especially in adolescents.
Examination and Imaging
  • Physical examination confirms relative shortening and altered forefoot alignment.
  • Weight-bearing radiographs quantify metatarsal length and help plan surgical correction.
  • Imaging can identify associated deformities or degenerative changes.


Treatment
Management depends on symptoms, degree of shortening, patient age, and functional impact.
Nonoperative
  • Appropriate footwear modifications, custom orthoses, and callus care may relieve mild discomfort in minimally symptomatic patients.
  • Observation is acceptable if there is no pain or significant cosmetic concern.
Surgical
Surgery is considered for pain, functional limitation, or significant cosmetic concerns. Two main approaches are used:
  1. Acute Lengthening (One-stage Bone Graft)
    • A single osteotomy (bone cut) is performed and interposed bone graft lengthens the metatarsal.
    • Generally limited to corrections of up to ~10 mm.
  2. Gradual Distraction Osteogenesis (External Fixation)
    • An external fixator (mini-Ilizarov or similar device) slowly pulls apart the bone at a controlled rate (~0.5–1 mm/day).
    • Allows larger lengthening (up to 15–20 mm).
    • Requires careful follow-up to monitor bone regeneration and soft-tissue adaptation.
Surgical Considerations
  • Concomitant soft-tissue procedures (capsulotomy, tendon lengthening) may be required.
  • Complications include joint stiffness, pin-site infection, neurovascular irritation, delayed union, and residual deformity.


Expectations and Prognosis
  • Recovery Time:
    • Acute bone graft lengthening typically requires 6–8 weeks for bone healing and gradual return to normal footwear.
    • Gradual distraction osteogenesis requires weeks to months for lengthening plus consolidation.
  • Functional Outcome:
    • Most patients achieve improved cosmetic appearance and relief of pain and calluses.
    • Toe alignment and gait mechanics usually improve, particularly when surgery is performed before skeletal maturity is complete.
  • Long-Term Considerations:
    • Recurrence is uncommon once skeletal growth is complete.
    • Some patients may have mild residual stiffness or altered joint motion.
    • Complications are rare when surgery is performed by experienced foot and ankle surgeons.


Key References (Peer-Reviewed)
  1. Giannini S, Faldini C, Pagkrati S, et al. Surgical treatment of brachymetatarsia of the fourth ray: a review of 30 cases. J Bone Joint Surg Am. 2003;85-A(4):817–823.
  2. Kancherla VK, Singh D, Chou L. Surgical management of brachymetatarsia: a review of techniques, outcomes, and complications. Foot Ankle Int. 2011;32(9):879–884.
  3. Masada K, Fujita S, Fuji T. Complications after lengthening for brachymetatarsia: a report of 17 cases. Foot Ankle Int. 1999;20(6):432–437.
  4. Jung HG, Park JY, Kim SW, Lee JS. Complications after distraction osteogenesis for fourth brachymetatarsia. J Foot Ankle Surg. 2011;50(6):687–690.
  5. Lee KB, Park HW, Kim MS, Seon JK. Modified surgical techniques for fourth brachymetatarsia: clinical and radiographic outcomes. Bone Joint J. 2013;95-B(2):243–248.


Summary
Brachymetatarsia is a rare condition—most often affecting the fourth metatarsal—caused by premature growth plate closure. Patients may present with toe shortening, discomfort, and cosmetic concerns. Mild, asymptomatic cases can be managed conservatively, but significant pain or deformity often requires surgical correction. Modern techniques, whether acute bone grafting or gradual lengthening, generally provide reliable functional and cosmetic outcomes when performed by experienced specialists.