Patellar instability is defined as hypermobility of the patella in either the medial or lateral direction.
Medial instability is extremely rare.
Complete dislocation and subluxation re...
Patient has severe pain and may have heard a pop at time of dislocation.
Knee is usually held in 20 to 30 degrees of flexion, and patella is palpable laterally.
Hemarthrosis causi...
If not reduced spontaneously, may require conscious sedation for pain control and muscle relaxation
Alternatively, arthrocentesis performed with instillation of 10 to 15 mL of...
Iobst CA, Stanitski CL. Acute knee injuries. Clin Sports Med. 2000;19(4):621–635.
Roberts DM, Stallard TC. Emergency department evaluation and treatment of knee and leg injurie...
Patellar dislocation is a common diagnosis in an adolescent with knee effusion after twisting injury. Tenderness of the medial patella in this situation can suggest patella dislocation...
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