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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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Updated: Dec 29, 2025

Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach
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The Adolescent Bunion.

Jacob R Zide

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    Summary
    This summary is machine-generated.

    Adolescent bunions stem from unique causes, differing from adult bunions due to metatarsal head dysplasia. Recognizing this distinct etiology is key for effective surgical management and preventing recurrence in young patients.

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    Area of Science:

    • Orthopaedic surgery
    • Pediatric orthopaedics
    • Foot and ankle surgery

    Background:

    • Adolescent bunion management presents challenges due to high recurrence and failure rates.
    • Surgeons often lack understanding of the distinct etiologies differentiating adolescent and adult bunions.
    • A multitude of surgical procedures adds to the complexity and hesitancy in managing adolescent bunions.

    Purpose of the Study:

    • To elucidate the distinct etiology of adolescent bunions compared to adult bunions.
    • To highlight the implications of understanding adolescent bunion etiology for surgical evaluation and treatment.
    • To address the consternation among orthopaedic surgeons regarding adolescent bunion management.

    Main Methods:

    • Comparative analysis of adolescent and adult bunion etiologies.
    • Focus on the congruency of the hallux metatarsophalangeal joint in adolescent bunions.
    • Identification of metatarsal head dysplasia as a primary cause in adolescents.

    Main Results:

    • Adolescent bunions exhibit a congruent hallux metatarsophalangeal joint, unlike adult bunions.
    • The deformity in adolescents is primarily caused by dysplasia of the metatarsal head.
    • This dysplasia leads to an elevated distal metatarsal articular angle (DMAA), indicating a valgus orientation.

    Conclusions:

    • Adolescent bunions arise from a distinct pathophysiology, primarily metatarsal head dysplasia.
    • Understanding the elevated DMAA is crucial for accurate diagnosis and tailored treatment in adolescents.
    • Recognizing these differences can improve surgical outcomes and reduce recurrence in pediatric hallux valgus.