Section 29: Knee Biomechanics Structure and Function 29-1 Femur - - PowerPoint PPT Presentation

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Nov 30, 2022 297 likes •437 views

Section 29: Knee Biomechanics Structure and Function 29-1 Femur Articular capsule Posterior cruciate cruciate ligament Lateral meniscus Anterior cruciate ligament Tibia A t Anterior View of Anterior View of A t i i Vi Vi f f

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Section 29: Knee Biomechanics Structure and Function

29-1

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Femur Articular capsule Posterior cruciate cruciate ligament Lateral meniscus Anterior cruciate ligament Tibia

A t i Vi f A t i Vi f

29-2 From: Garner

Anterior View of Anterior View of Right Knee Right Knee

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29-3 From: Iatridis

SLIDE 4

29-4 From: Peeler

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Quick Facts Quick Facts

Patellofemoral Joint
PFJ Loading

(PFJ)

Variations in PFJ loading

d i OKC ( ki ti g

Walking

– 0.3 x body weight

during OKC (open kinetic chain) and CKC (closed kinetic chain) activities

Ascending Stairs

– 2.5 x body weight

Descending Stairs
PFJ loading increases:

– with increased flexion in CKC

Descending Stairs

– 3.5 x body weight

Squatting

CKC – with increased extension in OKC – 7 x body weight

29-5 From: Scifers

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Movements at Joint 3 l f i 3 planes of motion

Sagittal plane (flex – ext)

g p ( )

– 0° to 140° of flexion – Largest range – Most important to movement p

Transverse plane (int – ext rotation)

– ROM influenced by position of the joint in the sagittal plane Ext almost no ROM – Ext. – almost no ROM – Max at 90° of knee flexion (45° of ext / 30° of into rotation) – Beyond 90° of knee flexion rotation decreases because of soft tissue approximation tissue approximation

Frontal plane (abd – adduction)

– None with knee in full ext. I k t 30° f fl i

29-6 From: Peeler

– Increases as knee moves to 30° of flexion

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29-7 From: Iatridis

SLIDE 8

29-8 From: Peeler

SLIDE 9

29-9 From: Iatridis

SLIDE 10

29-10 From: Iatridis

SLIDE 11

29-11 From: Peeler

SLIDE 12

29-12 From: Iatridis