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Posterolateral rotatory instability of the elbow
Janak A Mehta1, Gregory I Bain
1Department of Orthopaedic Surgery and Trauma, Royal Darwin Hospital, Northern Territory Clinical School, Flinders University of South Australia, Darwin, Northern Territory, Australia.
Posterolateral rotatory instability involves abnormal elbow joint displacement. Diagnosis relies on clinical examination and specific tests, with management focusing on ligament repair or reconstruction.
Area of Science:
- Orthopedic Surgery
- Biomechanics
- Sports Medicine
Background:
- Posterolateral rotatory instability (PLRI) is a complex elbow condition.
- It involves a three-dimensional displacement pattern of the ulna and radius relative to the humerus.
Purpose of the Study:
- To describe the pathophysiology of PLRI.
- To outline diagnostic methods and treatment options for PLRI.
Main Methods:
- Review of the biomechanical and clinical presentation of PLRI.
- Discussion of diagnostic physical examination maneuvers, including the posterolateral rotatory instability test.
- Overview of surgical management strategies.
Main Results:
- PLRI is characterized by external rotatory subluxation and valgus displacement during elbow flexion.
- Lateral ulnar collateral ligament injury is a key factor, leading to radial head subluxation.
- Clinical diagnosis is confirmed through specific physical tests, often under imaging or anesthesia.
Conclusions:
- Understanding the mechanism of PLRI is crucial for accurate diagnosis.
- Management typically involves ligamentous repair or tendon graft reconstruction to restore elbow stability.
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