Internal Joint Forces: ACL and Instability Flashcards
What do ACL, PCL, LCL and MCL stand for?
Anterior cruciate ligament (70% injuries caused by non-contact)
Posterior cruciate ligament
Lateral collateral ligament
Medial collateral ligament
Four ways an ACL injury may be prevent by altering the biomechanics of an athlete’s movements
- Reducing frontal plane knee joint angles
- Reducing frontal plane knee loading
- Increasing sagittal plane knee joint angles
- Reducing sagittal plane knee loading
How do you measure the Q-angle?
Line drawn from the ASIS to central patella and a second linedrawn from central patella to tibial tubercle
What is increased Q-angle a risk for?
A risk factor for patellar subluxation (dislocation)
What is a normal Q-angle in males and females?
14 degrees for males
17 degrees for females
Double leg sagittal plane jump landing tasks may not adequately represent single-leg lower extremity biomechanics. Why not?
Familiarity to single-leg version
The neural demands are different
Demands across joints differ
Knee valgus motion causes what to occur at the hip during a single leg drop jump?
Adduction and internal rotation at the hip, significantly greater with > knee valgus motion
Watch lecture recording
16: 52 - 31:09
32: 49 - 55:06
Why are drop pr depth jumping commonly selected by research studies?
Due to the high perceived intensity than other activities
What key mechanical/kinetic variables are measured during a drop jump?
- Impact Loading rate 10-90%
- Peak impact force
- Average impact force
- Peak propulsive force
What limitations to dynamic instability training may a researcher face?
Little consideration to adaptation
No familiarity to unique demands
Subsequent effects (stable surface)
What considerations to dynamic instability training may a researcher have?
Reflect a real-world training programme
Thorough analysis to understand underlying mechanical and neuromuscular mechanisms
Multi-variable approach (>250)
High internal hip & knee abduction torques are believed to result in what?
ACL injuries
What is a valid indicator of potential risk of an ACL injury?
Drop jumps and single legged hop
What three types of strength training is needed to reduce risk of ACL injury?
Hip & knee flexion strength training
Adduction and Abduction Extension strength training
(As well as increasing movement variability within training sessions may also help reduce the chance of theses types of injury’s)
Surface instability requires ** ** ** and *** of the subsequent effects when *** **** is ***
Surface instability requires more robust design and investigation of the subsequent effects when instability stimulus is removed
