Mason classification of radial head fractures

vigente

Classifies radial head fractures by displacement and comminution.

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Escala de categorias

I II III IV

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Procedência e vigência

Órgão emissor: Orthopedic consensus
Versão: 1954
Ano: 1954
Família: léxico
Tipo de lógica: flat
Modalidade: XR, CT
Fonte primária: Some difficulties in the treatment of fractures of the radial head (Mason)
Última verificação: 2026-06-26
Última checagem: 2026-06-26

Lógica de decisão

Forma estruturada (flat). Uma futura calculadora a lê; as categorias abaixo são a superfície legível.

Mostrar a lógica estruturada (JSON)

{
  "categories": [
    "I",
    "II",
    "III",
    "IV"
  ]
}

Categorias num relance

Cat.	Significado	Conduta	Risco	Fonte
I	Type I Non-displaced (or minimally displaced) radial head fracture — a fissure (crack) or marginal/peripheral fracture of the rim without displacement.	Nonoperative: brief immobilization in a sling/splint (on the order of days to ~2 weeks) followed by early active range of motion.	Favorable prognosis; one large series reported about 95% excellent or good outcomes with conservative care.	okfonte PMC3348319 (Morrey-context 'In Brief: The Mason Classification of Radial Head Fractures'), Treatment/Outcomes, Type 1.
II	Type II Marginal (partial articular) sector fracture of the lateral radial head that is displaced — separated from adjacent quadrants, impacted/depressed, or tilted out of alignment.	Variable, no firm consensus: nonoperative early mobilization for stable fractures without a mechanical block, versus open reduction and internal fixation (or fragment excision) when displacement is larger or motion is blocked.	Outcomes are variable; fractures are often more comminuted than they appear (three or more fragments in about 73% in one series), which can complicate repair.	okfonte PMC3348319 Treatment/Outcomes, Type 2.
III	Type III Comminuted fracture involving the whole radial head, with fragmentation and displacement of the entire head.	Operative: radial head excision, or open reduction and internal fixation versus radial head arthroplasty/replacement depending on reconstructability and elbow stability.	Generally requires surgery; comparative outcome data favoring one surgical strategy over another are limited.	okfonte PMC3348319 Treatment/Outcomes, Type 3.
IV	Type IV Any radial head fracture with a concomitant elbow dislocation, irrespective of the radial head fracture pattern (added by Johnston, 1962; later incorporated by Broberg and Morrey).	Operative and highly variable: ranges from closed management through ORIF to radial head excision or prosthetic replacement, with attention to restoring elbow stability and treating associated ligamentous/coronoid injury.	Higher-energy injury with associated instability; prognosis not specified per-type in the source.	okfonte PMC3348319 Type IV (Broberg-Morrey modification) Treatment section.

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