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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).
How long it can take for a sprained knee to heel is dependent upon  the severity of the injury and the patients capacity to heal. It  could take anywhere from a few weeks to â¦ a couple of months for  healing to occur.t depends on the usage. If you can lock your wrist in a stable position with something like a brace, the immobility will relieve tendons and ligaments of strain which will speed the healing process. Even then, it could take up to 6 weeks to fully recover. Light rehab can help depending on the severity of the sprain.