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Mild to mod- 6-8 wks: Mild to moderate sprains of knee ligaments that are appropriately treated nonoperatively should generally heal in 6-8 weeks. Not all ligament sprains are the same, and actual time to healing will vary based upon severity. Most typical knee mcl sprains (grade 2-3) heal in 6-8 weeks.et help from a doctor now âº. Sprain: That depends on what is sprained and the severity of injury. Minor sprain can be a few weeks. More severe injury can be months -- or never as may need surgery to fix (acl, meniscus, etc).
This can lead to compensated movement patterns of the knee and hip, potentially causing over-use injuries of other joints in the future. Grade 2 â Moderate Ankle Sprain. Larger but incomplete tear of the ligament. Normally the recovery is 4-6 weeks before considering return to sport drills, to allow optimal strength of the new scar tissue. Grade 3 â Severe Ankle Sprain. A complete rupture of the ankle ligament may require surgery. It can also include fractures of the bones.