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Ankle arthroscopy has a significant role in the treatment of the post traumatic joint (fracture or severe sprain) as well as early ankle arthritis from any cause.
Many of the soft tissue pathologies which cause symptoms in the post-trauma setting are poorly imaged by MRI so a normal scan should definitely not be a reason not to intervene in a joint failing to settle.
Instantaneous recovery never occurs after an ankle arthroscopy despite instantaneous removal of the causative pathologies. The joint linings need to heal just as any operated soft tissues do which may take 6-12 weeks condition dependent.