Exploring hand anatomy, extensor tendons, and forearm compartments in the orthopedic exam review. Emphasis on the intricate trifurcation of extensor tendons, pulley system in the hand, and wrist arthroscopy insights.
Understanding compartment divisions in the forearm is crucial to prevent compartment syndrome in trauma cases.
Extensor tendons trifurcate at the wrist, with central and lateral slips contributing to finger extension and joint stability.
Deep dives
Function and Anatomy of Forearm Compartments
The forearm is divided into dorsal, volar, and mobile wad compartments, each containing superficial and deep compartments. It is important to understand the muscle bellies and their relationships within these compartments, as in cases of trauma, releasing these compartments is crucial to prevent compartment syndrome.
Extensor Tendons Function and Anatomy
Extensor tendons trifurcate at the wrist, with a central slip inserting at the base of the middle phalanx, and lateral slips forming the lateral bands, inserting at the base of the distal phalanx to extend the DIP joint. Sagittal bands stabilize extensor tendons at the metacarpophalangeal joint, and pulleys help maximize joint rotation, force transmission, and prevent bowstringing of the fingers.
Flexor Tendons and Hand Muscles Function
Flexor tendons have a direct vascular supply via the vincular system, with synovial diffusion supporting a vascular zones. Hand muscles like lumbricals and interossei play crucial roles in flexing, extending, and stabilizing the hand joints. Understanding the anatomy and function of these structures is essential for the assessment and treatment of hand-related conditions.
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Enjoy another episode from our board review series featuring Dr. Cole and Dr. Woolwine.
This episode is sponsored by the American Academy of Orthopaedic Surgeons:
Filled with content that has been vetted by some of the top names in orthopaedics, the AAOS Resident Orthopaedic Core Knowledge (ROCK) program sets the standard for orthopaedic education.
Whether ROCK is incorporated into your residency curriculum, or you use it independently as a study tool, the educational content on ROCK is always free to residents. You’ll gain the insights and confidence needed to ensure a successful future as a board-certified surgeon who delivers the best patient care. Log on at https://rock.aaos.org/.
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