Knee Part 4 Flashcards

1
Q

IT Band runs from fascia over _____________ to ___________

A

TFL, glut. max., and glut. med. mm
to
lat. intermuscular septum and anterolat. tibia

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2
Q

ITB moves _______ to knee joint axis during knee extesnion and ________ during knee flexion

A

anterior, posterior

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3
Q

What remains consistently taut regardless of hip or knee position

A

ITB

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4
Q

In full extension, ITB helps ______ to check _______

A

ACL
Posterior femoral or anterior tibial translation

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5
Q

In flex., ITB helps ____________ to check ant. displacement of tibia

A

LCL, popliteal tendon, and ACL

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6
Q

Tight ITB
Snaps over the lateral condyle of the femur during

A

flexion and extension of the knee

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7
Q

TIght ITB can be painful in

A

runners
people who frequently squat

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8
Q

Secondary Knee Flexors

A
  • Sartorius*
  • Gracilis*
  • Popliteus*
  • Gastrocnemius
  • Plantaris
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9
Q

VMO creates an

A
  • Creates an oblique pull on the patella to keep it in the trochlear groove
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10
Q
  • Tibial on femoral knee extension external moment arm of the weight of the lower leg increases from
A

90-0 of knee flexion

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11
Q
  • Femoral on tibial knee extension external moment arm of the upper body weight
A

decreases from 90º-0º of knee flexion

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12
Q

External torques are relatively large from ______ of flexion via femoral on tibial extension and from _______ of flexion via tibial on femoral extension

A

90-45, 45-0

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13
Q

Pes Muscles Function

A

Internal rotators of the knee
Provide significant dynamic stability to the knee

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14
Q

Pes Muscles Function
Contraction of these muscles resist

A

External rotation of the knee

Valgus forces on the knee

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15
Q

Closed chain: avoid full

A

knee flexion (deep squats)

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16
Q

Open chain: avoid

A

60 to 0 (full extension) knee resistance exercises (such as sitting isotonic knee extensions against resistance)

17
Q

Tibial on Femoral Extension Arthrokinematics

A

The articular surface of the tibia rolls and slides anteriorly on the femoral condyles (concave on convex)

18
Q

Femoral on Tibial Extension Arthrokinematics

A

The femoral condyles simultaneously roll anteriorly and slide posteriorly on the articular surface of the tibia (convex on concave)

19
Q

Tibia slides ______ on femur during flexion

A

posteriorly
Tibia rotates medially during flexion

20
Q

Tibia slides _______ on femur during extension

A

anteriorly
Tibia rotates laterally during extension

21
Q

Closed Chain Arthrokinematics
Flexion

A

femur posterior roll
anterior slide
femur rotates laterally

22
Q

Closed Chain Extension

A

Roll anteriorly slide posteriorly
Femur rotates medially

23
Q

IR arthrokinematics

A

Internal spinning of tibia on femur

External spinning of femur on tibia

24
Q

ER Arthrokinematics

A
  • External spinning of tibial on femur
  • Internal spinning of femur on tibia
25
NORMAL VALGUS Angle formed at knee joint by
170-175° femoral and tibial longitudinal axes
26
Increased Knee Angle
Genu Varum >180
27
Decreased Knee Angle
Genu Valgum (knock knee) <170
28
Q Angle formed by
- From ASIS to center of patella - Center of the patella to the tibial tuberosity
29
Normal Q angle Males
8-14
30
Female Q Angle
15-17
31
Q angles >20 considered
abnormal
32
Genu Varus
Decreased Q Angle Compressed medially Tension Laterally
33
Genu Valgus
Q angle is increased Compressed laterally tension medially
34
- Genu Recurvatum Laxity and hypermobility of knee joint in
posterior direction
35
Genu Recurvatum Lack of
muscular control
36
Genu Recurvatum ________ of knee Increase in ________ compression Increase in ________ tension
hyperextension anterior posterior