About 90% of patients with ACL injuries fully recover, as long as they faithfully follow a good rehabilitation program. As a long-term complication, some patients with Grade III ACL injuries may eventually develop symptoms of osteoarthritis in the injured knee joint. According to one study, 50% to 60% of patients who suffered a severe ACL sprain showed X-ray evidence of knee osteoarthritis within 5 years after their ACL injury.
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