Arthrology: Knee Flashcards

1
Q

Tibiofemoral joint type

A

bicondylar/hinge

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2
Q

Menisci

A

Absorb shock, decrease friction, increase contact area

Hoop stress - distributes forces

Medial meniscus = “C”, larger
- attached to MCL and semimembranosus

Lateral meniscus = “O”,

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3
Q

Tibiofemoral morphology

A

Tibia = concave
Femur = convex

Tibial ER into end range extension (screw-home)
- increased stability to knee through bony congruency and ligamentous tension

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4
Q

Meniscal tear

A

Healing capacity is vascularity and age dependent

Blood flow greatest in periph 1/3

Femoral condyle imparts a sheer force to meniscus in WB beyond 115-120 deg knee flexion (deep squat)

Hamstring contraction tugs on posterior horn of meniscus

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5
Q

Patellofemoral joint type

A

plane/gliding

posterior surface covered w/ thick hyaline cartilage

slides w/in trochlear groove (depth = stability; lateral patella protrudes anterior)

compressive forces increase w/ knee flexion and quad force production

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6
Q

patellofemoral flexion arthrokinematics

A

inferior glide

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7
Q

patellofemoral extension arthrokinematics

A

superior glide

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8
Q

Patellar instability

A

MPFL or retinacular deficiency

Shallow trochlear groove

Flat patella

Patella alta

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9
Q

Proximal tibiofibular joint type

A

planar

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10
Q

PTFJ extension arthrokinematics

A

posterior glide

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11
Q

PTFJ flexion arthrokinematics

A

anterior glide

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12
Q

Tibiofibular dislocation

A

Consider structures attaching to fibular head

LCL
Popliteus m.
Fibularis longus
Biceps femoris

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13
Q

Innervation

A

femoral n.

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