- Loss of Joint Space from degeneration and cartilage loss is the most obvious cause.
- The reduction in joint space results in the meniscus being " squeezed" out of the joint like toothpaste.
- BUT...there is another important cause to look for..
- The meniscal roots fix the meniscus to the tibia.
- They are very important for maintaining stability of the meniscus and transmission of stress.
- Root tears result in accelerated joint degeneration.
- Posterior Root tears are a common cause of meniscus extrusion.
- When there is meniscal extrusion.
- There may be loss of joint space which may be the only cause BUT…
- Always look at the posterior horn root for a tear.
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