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Knee

Knee. Knee Extensor Mechanism (KEM). Quadriceps Patellofemoral Joint Quadriceps Tendon/Ligament Patella Tendon. Function of Patella. Function of Patella. Mechanical Advantage  rotary component of quadriceps force. Antatomy of Patella. Facets Lateral Medial (7 mm) Odd (most media).

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Knee

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  1. Knee

  2. Knee Extensor Mechanism (KEM) • Quadriceps • Patellofemoral Joint • Quadriceps Tendon/Ligament • Patella Tendon

  3. Function of Patella

  4. Function of Patella • Mechanical Advantage •  rotary component of quadriceps force

  5. Antatomy of Patella Facets • Lateral • Medial (7 mm) • Odd (most media)

  6. Antatomy of Patella

  7. Patellofemoral Mechanics

  8. Patellofemoral Mechanics In general, • With  flexion, contact migrates from inferior to superior • Medial facet receives most consistent contact • Odd facet least

  9. Patellofemoral Mechanics 25  1300 knee flexion: • 110 of medial tilting about a vertical axis (lateral lip) • 70 of lateral rotation about an anterior-posterior axis

  10. Patellofemoral Joint Reaction Forces • Gait (10-150 flexion) – 50% of BW • Stair Climbing (600 of flexion) – 3.3 x BW • Full Squat (1350) – 7.8 x BW

  11. Patellofemoral Joint Reaction Forces

  12. Patellofemoral Joint Reaction Forces Closed-Chain • JRF increase from 0 – 900 flexion Open-Chain • JRF decrease from 0 – 900 flexion

  13. Patellofemoral Joint Reaction Forces Open-chain • safest between 25 – 900 of flexion Closed-chain • safest between 0 - 450 of flexion

  14. Meniscus – Vasucular Supply

  15. Meniscus – Vasucular Supply

  16. Meniscus – Neural Supply

  17. Meniscus Innervation • Inner 1/3 – none • Outer 2/3 and horns (outer 1/3 > middle 1/3) • Nocieptors (pain) • Ruffini corpuscles (position) • Pacinian corpuscles (acceleration) • GTO (at end range)

  18. Patella Rupture

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