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Bones of the Upper Limb: Ulna

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side...

Bones of the Upper Limb: Radius

Bones of the Upper Limb: Radius

The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a...

Bones of the Upper Limb: Humerus

Bones of the Upper Limb: Humerus

The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...

Muscles that Move the Forearm

Muscles that Move the Forearm

The muscles that move the forearms can be divided into four groups: forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint, while the pronators and supinators act on the radioulnar joints.
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...

Muscles of the Forearm that Move the Hand and Fingers

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The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi...

Spinal Nerves: Plexus I

Spinal Nerves: Plexus I

Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
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The cervical plexus, formed by the anterior rami of the first four...

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Adamantinoma de Cúbito Proximal

Liam H Wong¹, Rosanna Wustrack¹, Nicolas Lee¹

¹Department of Orthopaedic Surgery, University of California San Francisco, San Francisco, CA.

Journal of hand surgery global online

|December 24, 2025

Resumen

El adamantinoma, un tumor maligno raro, puede ocurrir en huesos largos. Este caso destaca su presentación inusual en el cúbito, inicialmente mal diagnosticado, que requirió cirugía de rescate.

Palabras clave:

Adamantinoma Antebrazo de un solo hueso Displasia osteofibrosa Procedimiento de rescate de cúbito Adamantinoma cubital

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Área de la Ciencia:

Oncología Ortopédica; Radiología Esquelética

Sus antecedentes:

El adamantinoma es un tumor óseo maligno raro, que afecta predominantemente a la tibia.; Puede ocurrir en otros huesos largos, aunque con menos frecuencia.; El diagnóstico preciso es crucial para un manejo adecuado.

Objetivo del estudio:

Informar un caso raro de adamantinoma en el cúbito proximal.; Discutir los desafíos diagnósticos y el tratamiento de esta presentación inusual.; Enfatizar la importancia de considerar el adamantinoma en los diagnósticos diferenciales de las lesiones de huesos largos.

Principales métodos:

Informe de caso de una paciente con una lesión en el cúbito proximal.; Revisión del diagnóstico inicial (displasia osteofibrosa) y tratamiento (fijación interna).; Descripción del diagnóstico posterior de adamantinoma en la edad adulta y tratamiento de rescate (procedimiento de antebrazo de un solo hueso).

Principales resultados:

La paciente inicialmente se presentó con una fractura patológica del cúbito proximal.; El diagnóstico inicial fue displasia osteofibrosa, tratada conservadoramente.; El diagnóstico posterior confirmó adamantinoma, lo que requirió un procedimiento de rescate.

Conclusiones:

El adamantinoma puede presentarse de forma atípica en el cúbito, lo que plantea desafíos diagnósticos.; El diagnóstico tardío puede conducir a escenarios de tratamiento complejos.; El procedimiento de antebrazo de un solo hueso puede ser una opción de rescate eficaz para el adamantinoma cubital.