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The posterior ligament is thin and membranous, and consists of transverse and oblique fibers. Above, it is attached to the humerus immediately behind the capitulum and close to the medial margin of the trochlea , to the margins of the olecranon fossa , and to the back of the lateral epicondyle some little distance from the trochlea.
A partial dislocation is referred to as a subluxation. Dislocations are often caused by sudden trauma on the joint like an impact or fall. A joint dislocation can cause damage to the surrounding ligaments, tendons, muscles, and nerves. [2] Dislocations can occur in any major joint (shoulder, knees, etc.) or minor joint (toes, fingers, etc.).
The posterior fat pad is normally pressed in the olecranon fossa by the triceps tendon, and hence invisible on lateral radiograph of the elbow. [3] When there is a fracture of the distal humerus, or other pathology involving the elbow joint, inflammation develops around the synovial membrane forcing the fat pad out of its normal physiologic resting place.
Antero-posterior (AP) and lateral view of the elbow joint should be obtained. Any other sites of pain, deformity, or tenderness should warrant an X-ray for that area too. X-ray of the forearm (AP and lateral) should also be obtained for because of the common association of supracondylar fractures with the fractures of the forearm.
Osteosynthesis (open reduction and internal fixation) of the ulnar shaft is considered the standard of care in adults. It promotes stability of the radial head dislocation and allows very early mobilisation to prevent stiffness. [5] The elbow joint is particularly susceptible to loss of motion. [citation needed]
Studies generally use the x-ray appearance of the arm to determine how displaced a fracture is. The definition of ‘displaced fractures' are variable, with anything from 2mm to more than 15mm; [4] however x-rays on which this assessment is made are known to be hugely misleading with fractures showing little displacement having >10mm displacement using CT scans.
Elbow dislocations constitute 10% to 25% of all injuries to the elbow. The elbow is one of the most commonly dislocated joints in the body, with an average annual incidence of acute dislocation of 6 per 100,000 persons. [30] Among injuries to the upper extremity, dislocation of the elbow is second only to a dislocated shoulder. A full ...
The acute rupture occurs in collisions when the elbow is in flexion such as that in a wrestling match or a tackle in football. The ulnar collateral ligament distributes over fifty percent of the medial support of the elbow. [16] [17] This can result in an UCL injury or a dislocated elbow causing severe damage to the elbow and the radioulnar joints.