The quadriceps tendon has a three-layer architecture on cross-section — the superficial rectus femoris layer, the middle vastus layer, and the deep articularis genu-vastus intermedius layer. This layered structure provides redundancy and allows partial thickness tears to occur without complete extensor mechanism failure. Partial quadriceps tendon tears (30-50% thickness) may be managed conservatively with early active therapy if the patient can perform a straight-leg raise.
Transmits quadriceps force to the patella in three distinct layers providing redundancy and oblique vector control
Partial quadriceps tendon tears are graded by the percentage of tendon remaining intact on MRI. Type I (<50% torn, SLR possible) may be managed conservatively with a knee brace locked in extension. Type II (>50% torn, weak SLR) and Type III (complete) require surgical repair. Post-repair rehabilitation requires 6 months to achieve full return-to-sport.
Mid-substance tendon partial disruption graded by MRI — Type I managed conservatively with bracing, Type II-III with surgical repair.
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