lecture 14: karen

Question 1

what are the important ligaments for karens soccer lecture

Answer 1

anterior cruciate lig
posterior cruciate lig

Question 2

what is the function of ACL

Answer 2

resist anterior glide of tibia on femur

Question 3

what is the function of PCL

Answer 3

resist posterior glide of tibia on femur

Question 4

are there more contact or non contact ACL injuries

Answer 4

non contact (70-80%)

Question 5

how is the ACL injured by contact

Answer 5

foot planted
femur driven posterior
rotatio

Question 6

how is all injured by non contact

Answer 6

landing/decelleration/pivoting/cutting
knee/hip in extension and valgus
quadriceps overload

Question 7

what is the non contact position of knee and hip that makes u vulnerable

Answer 7

knee/hip in extension and valgus

Question 8

what are the solutions to the non contact act injuries

Answer 8

ACL reconstructive surgery and extensive rehabilitation

Question 9

what are the problems with reconstructive surgery

Answer 9

many get reinjured
less people return to competition (unable to return to sport)
decrease mental quality of life

Question 10

what is the movement for sidestepping

Answer 10

move contralateral direction of your planted foot (example plant with left foot and then cut to right)

Question 11

true or false: sidestepping maneuver is associated with contact injuries

Answer 11

false, non contact act injuries (especially in stance phase)

Question 12

explain the ACL mechanism of injury joint positions

Answer 12

knee valgus and hip internal rotation
tibial intermal and or external rotation

Question 13

what are the 4 major factors contributing to ACL injuries

Answer 13

1) players factors: females more likely, novice will try to protect
2) unanticipated cutting
3) dynamic obstacle
4) knee and hip position

Question 14

what was the research question

Answer 14

during unanticipating cutting, to what extent does the presence of a dynamic defender impact lower extremity joint kinematics and clearance
(and how its related to skill level)

Question 15

what was instrumentation of the study

Answer 15

9 camera motion capture with reflective markers

Question 16

what was general procedure of the study

Answer 16

patient runs and is going to do an unanticipated cut at a 45 degree angle
3 conditions (14 trials each): No obstacle, static obstacle and dynamic obstacle
=during NO and SO the direction of cut was randomized
=during DO they only used dominant limb but 50% of the time the defender moved and the other stayed static

Question 17

what were the results and discussion in terms of risk of acl injuries

Answer 17

there was no difference bw skill groups for knee value, knee internal rotation and hop internal rotation

but competitive players had higher hip flexion (==more competitive players were better at attenuation of impact by landing in less erect position)

and lower peak external rotation (better control of knee stability and different cutting strategies)

Question 18

what were the results and discussion in terms of clearance

Answer 18

regardless of skill level, they took a higher clearing distance when faced with a dynamic obstacle (0.6m)

taking a larger distance is reflective of a cautious approach

Question 19

what was the conclusion of the study

Answer 19

it was the first study to investigate joint kinematics in soccer while avoiding a dynamic defender which is closer to real game scenario
can provide info and knowledge on causes of ACL injury and insight for coaching and training programs