Lipohaemarthrosis of the shoulder
Patient in altercation and restrained. Following this, tenderness around shoulder joint.
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Off-ended fracture through the surgical neck of humerus. Associated joint space swelling with pseudo-subluxation and lipohaemarthrosis just superior to the glenoid fossa.
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The "surgical neck" is a common site for humeral fractures.
Identifying a lipohaemarthrosis is less common, as this typically requires the patient to remain upright and relatively static for this to develop. It follows the same underlying principle as at the knee and with other joint fractures, with marrow fat and blood causing a fluid/fluid level.