https://www.rcmclinic.com/patient-i...-knee-diagnosis/85-grade-ii-or-iii-mcl-sprain
Injury or Condition
This injury represents an incomplete (Grade II) or a complete (Grade III) rupture of the collagen fibers which connect the ends of the femur (thigh bone) and the tibia (shin bone).
Cause
The most common cause is an excessive strain applied to the stabilizing ligament on the medial (inner) aspect of the knee during sports, such as skiing and soccer, or as the result of a fall.
Recovery
Expected recovery usually occurs in 3 weeks to 3 months, depending on the severity of the injury, although lingering minor stiffness and soreness for six months is not uncommon.
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