PHTY100 Lecture Notes - Lecture 6: Vastus Medialis, Quadriceps Femoris Muscle, Vastus Lateralis Muscle
Document Summary
Stability at knee: meniscus: increase contact area at tibiofemoral joint, reduces stress at joint surfaces, ligaments: primary and secondary restraints, knee joint locking: medial surfaces larger than lateral. Has fibrous connections to biceps femoris, vastus lateralis and lateral patellar retinaculum- may influence patella tracking through these connections. Consistently taut regardless of knee and hip position. Assists acl in preventing anterior side of tibia on femur: quadriceps femoris muscle: (lateralis, medialis, intermedius, rec fem) Medialis: action of producing last few degree of knee extension. Vastus medialis obliquus: distal fibres of vm aligned obliquely, realign pull of vm to improve efficiency, maintain alignment of patella. Primary and secondary restraint: combination of structures give stability at knee, no single structure in isolation, primary: worker, secondary: helper. If primary is damaged, secondary takes load, leads to deterioration and joint instability. Knee lock mechanism: medial surfaces larger than lateral, extension: Lateral side completes motion earlier than medial.
