Anteriot Hip (Liederbach)

Question 1

Anteriot Hip (Liederbach)

Pathogenesis of hip problems in dance: three functional requirements

Answer 1

• Turn out
• Expansive ROM
• Repetitive FABER

Question 2

What is the aesthetic ideal #1 according to HCDI survey done to 62 dance students?

Answer 2

“perfect turnout” followed by “hip joint flexibility”

Question 3

Anterior hip - Liederbach

What is the standard posture of a mature dancer (>21)

Answer 3

flat back posture

(in flat back posture the glut max tend to be turned off)

Question 4

What is the standard posture of a young dancer (<21)?

Answer 4

Lordotic posture

so what muscles tend to get short or long?

Question 5

In what direction do the acetabulum and femoral head face?

Answer 5

oriented anteriorly

Also, after 5 deg on hip EXT

Question 6

with stress in the anterior structures (hip, knee, ankle), soft tissues become inefficient as a static restraint which results in

Answer 6

diminished position sense (propioception)

Question 7

what is instability?

Answer 7

Excessive stretching of the capsulo-ligamentous structures

Question 8

the more instability in the joint →

Answer 8

the more risk for labral tear and vice-versa

Question 9

What is the glut max responsibility at the hip according to Sahrmann 2002?

Answer 9

maintains the femoral head in neutral zone

“turned off” in the flat back posture of mature dancers

Question 10

A dancer with flat back posture lies prone to perform a hip EXT SLR? What tends to occur at the hip joint arthrokinematically speaking?

Answer 10

the femoral head is gliding anteriorly

Question 11

Liederbach’s hypothesis regarding ROM spectrum in younger dancers: musculoskeletal complaints at the hip related to

Answer 11

the acquisition of ROM necessary to perfect dance technique

Question 12

Liederbach’s hypothesis regarding ROM spectrum in mature dancers: musculoskeletal complaints at the hip related to

Answer 12

repetitive practice of end-range dance skills once ROM for technique is achieved (controlling the ROM they had acquired)

Question 13

Liederback: the “young problem” AKA

Answer 13

Coxa Saltans / iliopsoas Syndrome

Question 14

Liederback: the “young problem”

Answer 14

Coxa Saltans / iliopsoas syndrome

Dancers predisposed to muscular imbalances because they practice movements habitually and shorten muscles on one side of the joint

Question 15

Liederback: the “young problem” (coxa saltans) can be classified into 3 categories:

Answer 15

1. Internal: ilipsoas over iliopectineal line
2. External: ITB or glut max over greater trochanter
3. Intra-articular: loose bodies

Question 16

Prevalence of coxa saltans (iliopsoas syndrome) amongst professional dancers

Answer 16

90%

Question 17

Findings in anterior hip pain in mature dancers (<21)

(supporting Dr. Sherman’s Anterior Femoral Glide Instability model)

Answer 17

• Symptomatic side:
  
  • long psoas
  • short strong hamstrings
  • weak glutes
  • hypomobile ankle: TCJ and/or STJ
  • 100% history of prior ankle sprain
• • airplane test: poor motor control during function
• core control

Question 18

How common are Iabral tears among dancers in this subset of anterior hip pain?

Answer 18

• 50% of dancers over a 3 yr period
• repetitive microtrauma

Question 20

True or false: according to a cadaver study external rotation & abduction generate substantial strains in the anterosuperior labrum

Answer 20

true