The clinically stable knee with haemarthrosis
Clinically and radiographically apparent injuries of the knee, with or without haemarthrosis, normally do not present a problem of surgical diagnosis, in contradistinction to post-traumatic haemarthrosis occurring in the clinically stable knee without osseous injury. Bleeding into the knee joint may be secondary to a capsular injury requiring nonoperative treatment, a cartilage fracture requiring operative treatment, or an isolated rupture of the anterior cruciate ligament (ACL). It is important to recognize that the prognosis of an injury requiring operative treatment depends critically on the timing of surgical intervention. To avoid missing the mostfavourable time for intervention, arthroscopy should be performed promptly so that a definitive diagnosis can be made.
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