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Related Concept Videos

Bones of the Upper Limb: Ulna01:15

Bones of the Upper Limb: Ulna

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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...
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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...
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Spinal Nerves: Plexus I01:22

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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.
The Cervical Plexus
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Bones of the Upper Limb: Humerus01:19

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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...
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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
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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
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Novel Triple-Loop Technique for Suturing TFCC Injuries without Transosseous Tunnel
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Ulnar lengthening and shortening.

R L Linscheid

    Hand Clinics
    |February 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Altering distal ulna length, through recession or lengthening, offers a less invasive treatment for distal radioulnar joint issues. These procedures effectively address conditions like Kienböck

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    Area of Science:

    • Orthopedic Surgery
    • Hand and Wrist Surgery
    • Biomechanics

    Background:

    • Mechanical and degenerative conditions of the distal radioulnar joint (DRUJ) often require invasive surgical interventions.
    • Existing treatments may involve significant tissue disruption, leading to potential complications and prolonged recovery.
    • Distal ulna length alterations present a potentially less destructive surgical alternative for managing various DRUJ pathologies.

    Purpose of the Study:

    • To evaluate the efficacy of distal ulna length alterations (ulnar recession and lengthening) as treatment modalities for DRUJ disorders.
    • To explore the specific indications and benefits of ulnar recession and ulnar lengthening in managing distinct wrist pathologies.

    Main Methods:

    • Review of surgical techniques involving ulnar recession and ulnar lengthening for DRUJ conditions.
    • Analysis of clinical outcomes and effectiveness in treating specific pathologies such as ulnolunate impingement, triangular fibrocartilage tears, and Kienböck's disease.

    Main Results:

    • Ulnar recession demonstrates effectiveness in treating ulnolunate impingement, triangular fibrocartilage tears, and symptomatic ulnar plus variance.
    • Ulnar recession is also beneficial for chondromalacia of the ulnar head and stabilizing the DRUJ by altering the bearing surface and tightening the ulnocarpal ligamentous complex.
    • Ulnar lengthening provides relief for Kienböck's disease by decompressing the lunate and redistributing joint forces, and may benefit certain cases of non-displaced carpal instability (NDCI) with an ulnar minus variant.

    Conclusions:

    • Distal ulna length modification, via recession or lengthening, represents a viable and less destructive surgical approach for managing diverse distal radioulnar joint pathologies.
    • These techniques offer targeted benefits for specific conditions, improving joint mechanics and alleviating pain, thereby enhancing patient outcomes in wrist surgery.