Cadaver study testing whether a posterior medial meniscal root tear mimics total meniscectomy biomechanically. 9 fresh-frozen knees were loaded at 1000 N across four flexion angles under four conditions: intact, root tear, root repair, and total medial meniscectomy. The central question: does the tear behave like a meniscectomy, and can repair reverse it?
A posterior medial meniscal root tear on MRI — especially with meniscal extrusion. Represents a functional meniscectomy. The medial compartment is under the same pathologic load as after complete meniscal removal, quantified here at 25% above normal.
When you see this injury in a repairable patient, debridement alone is not acceptable. Repair is the only intervention shown to restore contact pressure and correct the kinematic cascade: external rotation, lateral tibial translation, and varus shift that drive cartilage degeneration.
In clinic, when medial meniscal extrusion appears on MRI without an obvious body tear, scrutinize the posterior root on coronal and sagittal sequences. A root avulsion or radial tear at the attachment site changes the surgical plan entirely.
The bimodal patient profile matters: middle-aged patients with BMI >30 and younger athletes with acute injury are both at risk. Not just the young athlete.
Cadaver study testing whether a posterior medial meniscal root tear mimics total meniscectomy biomechanically. 9 fresh-frozen knees were loaded at 1000 N across four flexion angles under four conditions: intact, root tear, root repair, and total medial meniscectomy. The central question: does the tear behave like a meniscectomy, and can repair reverse it?
A posterior medial meniscal root tear on MRI — especially with meniscal extrusion. Represents a functional meniscectomy. The medial compartment is under the same pathologic load as after complete meniscal removal, quantified here at 25% above normal.
When you see this injury in a repairable patient, debridement alone is not acceptable. Repair is the only intervention shown to restore contact pressure and correct the kinematic cascade: external rotation, lateral tibial translation, and varus shift that drive cartilage degeneration.
In clinic, when medial meniscal extrusion appears on MRI without an obvious body tear, scrutinize the posterior root on coronal and sagittal sequences. A root avulsion or radial tear at the attachment site changes the surgical plan entirely.
The bimodal patient profile matters: middle-aged patients with BMI >30 and younger athletes with acute injury are both at risk. Not just the young athlete.