Anteriot Hip (Liederbach) Flashcards
Anteriot Hip (Liederbach)
Pathogenesis of hip problems in dance: three functional requirements
- Turn out
- Expansive ROM
- Repetitive FABER
What is the aesthetic ideal #1 according to HCDI survey done to 62 dance students?
“perfect turnout” followed by “hip joint flexibility”
Anterior hip - Liederbach
What is the standard posture of a mature dancer (>21)
flat back posture
(in flat back posture the glut max tend to be turned off)
What is the standard posture of a young dancer (<21)?
Lordotic posture
so what muscles tend to get short or long?
In what direction do the acetabulum and femoral head face?
oriented anteriorly
Also, after 5 deg on hip EXT
with stress in the anterior structures (hip, knee, ankle), soft tissues become inefficient as a static restraint which results in
diminished position sense (propioception)
what is instability?
Excessive stretching of the capsulo-ligamentous structures
the more instability in the joint →
the more risk for labral tear and vice-versa
What is the glut max responsibility at the hip according to Sahrmann 2002?
maintains the femoral head in neutral zone
“turned off” in the flat back posture of mature dancers
A dancer with flat back posture lies prone to perform a hip EXT SLR? What tends to occur at the hip joint arthrokinematically speaking?
the femoral head is gliding anteriorly
Liederbach’s hypothesis regarding ROM spectrum in younger dancers: musculoskeletal complaints at the hip related to
the acquisition of ROM necessary to perfect dance technique
Liederbach’s hypothesis regarding ROM spectrum in mature dancers: musculoskeletal complaints at the hip related to
repetitive practice of end-range dance skills once ROM for technique is achieved (controlling the ROM they had acquired)
Liederback: the “young problem” AKA
Coxa Saltans / iliopsoas Syndrome
Liederback: the “young problem”
Coxa Saltans / iliopsoas syndrome
Dancers predisposed to muscular imbalances because they practice movements habitually and shorten muscles on one side of the joint
Liederback: the “young problem” (coxa saltans) can be classified into 3 categories:
- Internal: ilipsoas over iliopectineal line
- External: ITB or glut max over greater trochanter
- Intra-articular: loose bodies
Prevalence of coxa saltans (iliopsoas syndrome) amongst professional dancers
90%
Findings in anterior hip pain in mature dancers (<21)
(supporting Dr. Sherman’s Anterior Femoral Glide Instability model)
-
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
How common are Iabral tears among dancers in this subset of anterior hip pain?
- 50% of dancers over a 3 yr period
- repetitive microtrauma
True or false: according to a cadaver study external rotation & abduction generate substantial strains in the anterosuperior labrum
true
