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Please ask a qualified health professional about symptoms, treatment decisions, or concerns about your own condition.
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Bones & Joints
Meniscal root tears are complete detachments of the meniscus (cartilage cushion in the knee) from its attachment point (root) to the tibia (shin bone), most commonly affecting the posterior (back) root of the medial (inside) meniscus in patients over 50 years. These tears are biomechanically equivalent to having no meniscus at all—when the root detaches, the meniscus loses its ability to distribute load across the knee, causing stress concentration on underlying cartilage similar to total meniscectomy (complete meniscus removal). This leads to rapid cartilage degeneration and knee arthritis if untreated. Medial meniscus posterior root tears (MMPRT) typically occur from degenerative changes (age-related weakening of root attachment) or acute trauma, presenting as acute knee pain, swelling, and difficulty bearing weight—often misdiagnosed as simple meniscus tear or arthritis. MRI shows characteristic 'ghost meniscus' sign (meniscus extruded or pushed out from joint). Treatment options include conservative management (acceptable for low-demand patients but leads to arthritis progression) or surgical root repair (transtibial pull-out technique) which can slow arthritis progression and relieve pain in 70-80% of patients, though cannot reverse existing cartilage damage.
What it is and why it happens
Meniscal root tears are complete detachments of the meniscus (cartilage cushion in the knee) from its attachment point (root) to the tibia (shin bone), most commonly affecting the posterior (back) root of the medial (inside) meniscus in patients over 50 years. These tears are biomechanically equivalent to having no meniscus at all—when the root detaches, the meniscus loses its ability to distribute load across the knee, causing stress concentration on underlying cartilage similar to total meniscectomy (complete meniscus removal). This leads to rapid cartilage degeneration and knee arthritis if untreated. Medial meniscus posterior root tears (MMPRT) typically occur from degenerative changes (age-related weakening of root attachment) or acute trauma, presenting as acute knee pain, swelling, and difficulty bearing weight—often misdiagnosed as simple meniscus tear or arthritis. MRI shows characteristic 'ghost meniscus' sign (meniscus extruded or pushed out from joint). Treatment options include conservative management (acceptable for low-demand patients but leads to arthritis progression) or surgical root repair (transtibial pull-out technique) which can slow arthritis progression and relieve pain in 70-80% of patients, though cannot reverse existing cartilage damage.