Hip, Knee, and Limb Length Lab Flashcards Preview

Biomechanics > Hip, Knee, and Limb Length Lab > Flashcards

Flashcards in Hip, Knee, and Limb Length Lab Deck (26)
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1
Q

What is the normal values for hip extension? hip flexion?

A

hip extension: 0-20

hip flexion: 120-130

2
Q

What does knee flexion w/ internal leg rotation check for?

A

checks lateral hamstring tightness

3
Q

what does knee flexion w/ external leg rotation check for?

A

checks medial hamstring tightnes

4
Q

what is normal values for internal/external leg rotation?

A

160-180 degrees

5
Q

how would you isolate the medial hamstrings?

A

flex the knee to 90 degrees and then fully EXTERNALLY rotate the lower leg

6
Q

how would you isolate the lateral hamstrings?

A

flex the knee to 90 degrees and then fully INTERNALLY rotate the lower leg

7
Q

what is normal hip rotation for infants?

A

external : 60-90

internal: 0-30
* this is a 3:1 ratio

8
Q

what is normal hip rotation for up to 1 y/o?

A

external: 50-60
internal : 30
*this is a 2:1 ratio

9
Q

wha tis normal hip rotation for 4y/o to adult?

A

external- 45
internal 45
*this is a 1:1 ratio

10
Q

when the hip is flexed and knee is flexed, what structures tighten?

A

ischiofemoral ligament

*promotes external hip rotation

11
Q

when the hip is extended and knee is flexed, what structures tighten?

A

iliofemoral, pubofemoral, and ligamentum teres

*promotes internal hip rotation

12
Q

how do you calculate NFP?

A

max. external rotation - (ext + int rotation/2)

13
Q

if there is no change in NFP, what does this suggest?

A

the cause is bony

14
Q

if there IS a change in NFP, what does this suggest?

A

the cause is soft tissue structures

15
Q

name the external rotators of the hip.

A
gemelli - superior and inferior
obturator internus and externus
adductors
gluteus maximus
sartorius
quadriceps femoris
piriformis
*mnemonic: "get out and get some quality players"
16
Q

name the internal rotators of the hip

A

gluteus minimus

gluteus maximus

17
Q

what is the normal values for sagittal plane motion of the hip?

A

extension: 0-20
flexion: 120-130

18
Q

what is normal values for frontal plane motion of the hip?

A

abduction: 40-45
adduction: 20-25

19
Q

what is normal values for knee extension/flexion?

A

knee extension: 0-15

knee flexion: 135

20
Q

what is considered normal value for space btwn knees?

A

ankle and medial knee spacing within 2 inches

21
Q

what is genu varum?

A

knees separated more than 2 inches in relationship to ankles

22
Q

what is genu valgum?

A

ankles separated by more than 2 inches in relationship to medial knees

23
Q

what is genu recurvatum?

A

knees are hyperextended in a standing position

24
Q

what is the direct method to measure limb length?

A
  1. measure ASIS to medial malleolus
  2. measure from umbilicus to medial malleolus
  3. mark the inferior aspect of medial malleolus on each leg, place the malleoli next to each other, then measure the height difference btwn the marks
25
Q

what is the indirect method to measure limb length?

A
  1. WB with foot in normal resting position
  2. pelvic landmarks palpated, keeping hands parallel
  3. ASIS and PSIS lcoated
  4. place blocks of known thickness under short side until landmarks are same level
26
Q

what is standing method to measure limb length?

A
  1. patient stands in angle and base of gait
  2. examiner palpates Anterior superior iliac crests and greater trochanter.
  3. evluation should be performed RCSP and NCSP.
  4. a limb length that improves with feet in neutral position demonstrates a functional limb length.
  5. if a difference exists in RCSP and NCSP may demonstrate a structural limb length