innominates

Question 1

self-bracing mech

Answer 1

• attained by form + force closure
• model that allows for eff locomotion and weight transfer
• form closure via structural anatomy of wedge shaped sacrum
• force closure requires horizontal, compressive force and friction to withstand vertical load

Question 2

form closure

Answer 2

• structural anatomy of the wedge shaped sacrum

- internal structure of the SI joints

Question 3

force closure

Answer 3

• creates compressive lateral force and friction to withstand vertical load
• accomplished by ligaments and mm

Question 4

innominate motion

Answer 4

physio
- rotation
- flaring
non-physio
- shearing

Question 5

dx innominate SD

Answer 5

• standing flexion test - laterality

- landmarks - ASIS and PSIS

Question 6

ant/post rotation occurs at what axis of sacrum?

Answer 6

inferior transverse axis (iliosacral)

Question 7

what motion causes anterior rotation?

Answer 7

extension of hip

Question 8

what motion causes posterior rotation?

Answer 8

flexion of hip

Question 9

anteriorly rotated innominate etiology

Answer 9

• tight quads
• leg length discrepancy
• patient c/o hamstring tightness, spasm, ipsilat sciatica

Question 10

posteriorly rotated innominate etiology

Answer 10

patient c/o

• inguinal/groin pain (rectus femoris dysfx)
• medial knee pain (sartorius dysfx)

Question 11

innominate flare is about which axis?

Answer 11

rotation of innominate along a vertical axis

Question 12

medial flare etiology

Answer 12

• patient c/o pelvic or SI joint pain

- tender SI and inguinal ligaments, pubic symphysis

Question 13

lateral flare etiology

Answer 13

• patient c/o pelvic or SI pain

- tender SI and inguinal ligaments

Question 14

medial flare occurs with what motion?

Answer 14

• extension of hip

- ant innominate rotation

Question 15

lateral flare occurs with what motion?

Answer 15

• flexion of hip

- posterior innominate rotation

Question 16

physiologic motions

Answer 16

• rotation and flare
• happens with every step
• SD tend to be less painful –> ligaments can compensate

Question 17

non-physiologic motion

Answer 17

• shear
• body not meant to move that way
• painful –> ligaments can’t compensate

Question 18

innominate shear

Answer 18

• traumatic positional change
• apparent vertical transmission of the entire innominate within the SI joint, either sup or inf
• strains the ligament which can’t compensate = pain

Question 19

superior and inferior innominate shear etiology

Answer 19

patient c/o pelvic pain

Question 20

superior and inferior innominate shear palpatory findings

Answer 20

• tissue texture changes

- tenderness at ipsilat SI and pubes

Question 21

pubic symphysis SD

Answer 21

• superior
• inferior
• compressed

Question 22

pubic symphysis SD generally seen with what injuries?

Answer 22

saddle injuries or other trauma

Question 23

pubic shear etiology

Answer 23

patient c/o pelvic pain or pubic arch pain (inferior: hypertonic adductors)

Question 24

pubic shear palpatory findings

Answer 24

• tissue texture changes

- tenderness at ipsilateral pubes