The joint rapidly fills with blood causing:
In most patients, particularly those without underlying neurologic sensory deficits or bleeding disorders, the cause of hemarthrosis is usually apparent from the history, as it often follows a clearly recognized traumatic event. Following an injury with intra-articular damage, the swelling from bloody synovial fluid accumulation is typically rapid within a few hours. Pain is a significant component; however, it may take time to develop, or may be minimal or absent in patients with pre-existing impaired sensation. The range of motion of the affected joint is typically significantly reduced. (1)
Reference
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