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Knee - PowerPoint PPT Presentation


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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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Presentation Transcript
knee extensor mechanism kem
Knee Extensor Mechanism (KEM)
  • Quadriceps
  • Patellofemoral Joint
  • Quadriceps Tendon/Ligament
  • Patella Tendon
function of patella1
Function of Patella
  • Mechanical Advantage
  •  rotary component of quadriceps force
antatomy of patella
Antatomy of Patella

Facets

  • Lateral
  • Medial (7 mm)
  • Odd (most media)
patellofemoral mechanics1
Patellofemoral Mechanics

In general,

  • With  flexion, contact migrates from inferior to superior
  • Medial facet receives most consistent contact
  • Odd facet least
patellofemoral mechanics2
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
patellofemoral joint reaction forces
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
patellofemoral joint reaction forces2
Patellofemoral Joint Reaction Forces

Closed-Chain

  • JRF increase from 0 – 900 flexion

Open-Chain

  • JRF decrease from 0 – 900 flexion
patellofemoral joint reaction forces3
Patellofemoral Joint Reaction Forces

Open-chain

  • safest between 25 – 900 of flexion

Closed-chain

  • safest between 0 - 450 of flexion
meniscus innervation
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)