A 2008 study stated that the most common musculoskeletal tendinous and ligamentous injuries were knee injuries.  Although, during athletic activities, there are varied incidences of joint injuries, in activities such as skiing, snowboarding, other winter Olympic sports, wakeboarding, spinning, soccer, and military training, knee injuries are consistently among the most reported injuries.        Many knee injuries can be treated conservatively with rest, ice, immobilisation, and physical therapy. However, other knee injuries will require surgical intervention. These procedures are, for the most part, relatively low-risk surgeries and can be performed on an outpatient basis.
Acute knee injuries
Acute knee injuries are a new-onset disease process or new injury. By most definitions, acute knee injuries are defined as being diagnosed within the first 30 to 42 days of the injury or onset of symptoms.
Chronic knee injuries
Chronic knee injuries are due to residual old trauma or surgery, existing degenerative diseases, or previous conditions not resolved within the first 30 to 42 days after the onset.