bio mech

3 separate bones for innominate bone

Pubis, ilium, and ischium

1. T/F the pubic symphysis moves a significant amount

False

1. Muscles have proximal attachment at ischial tuberosity 

Hamstrings and adductor magnus

Femur has convexity, which increase WB tolerance, label tension and compression sides 

Compression side is the medial side of the femur and the lateral side is the tension side

1. Draw portion of the femoral neck that undergoes tension and compression in standing

top - tension

bottom- compression

1. Describe arthrokinematics in pelvic-on-femoral motion

pelvis moving on stable femur = concave on convex = same roll/slide

Largest muscle for largest moment arm for hip extension

(glute max or bicep femoris) sagittal plane of femoral + muscles

What quad muscles crosses the hip/ what is proximal attachment

rectus femoris → connects at ASIS

Label the following: adductor magnus, sartorius, obturator internus

how does adductor magnus can create hip flexion, hip extension, and hip adduction

• Hip Adduction (The Broad Job): The entire muscle is built for this. With its origins spanning along the bottom of the pelvis, any contraction will pull the thigh inward toward the center line.

• Hip Flexion (The Front Role): The "anterior" or front fibers originate furthest forward on the pelvis. When the leg is stretched behind the body, these fibers are stretched, and when they contract, they pull the leg forward.

• Hip Extension (The Back Role): The "posterior" or back fibers originate furthest back on the "sit bone," just like the hamstring group. When the leg is in front of the body (flexed), these fibers are elongated, and when they contract, they drive the leg backward.

Explain graph and implications of lifting an object from floor

hip external moment arm, pelvic-on-femoral flexion

3 joints/ compartments of the knee

Lateral and medial tibiofemoral and patellofemoral

Draw genu varum, what joint would increase “wear-and-tear”

knees angled outward

Medial tib-fem

T/F: muscles attach to the meniscus

true (popliteous muscle)

Primary and secondary function of the menisci

absorb compression / manage shear

Primary role of MCL/LCL? what are secondary roles?

primary- is to prevent excessive frontal plane motion, secondary- limited sagittal and axial rotations

Please demonstrate what range has the highest external torque demands on the knee in both open and closed chain

closed chain- barbell back squat

open- seated leg extension

T/F knee flexor torque production is more governed by F-L relationship then by internal moment arm

True