biomechanics

Question 1

What is normal leg/knee alignment?

Answer 1

170-175 degrees of valgus

Question 2

What angle has the largest patellofemoral contact?

Answer 2

90 degrees

Question 3

Why do intra-articular ligaments have poor healing potential?

Answer 3

Rupture tissue undergoes phagocytic action when exposed to synovial fluid.

Question 4

What range of motion is safe in OKC post ACL?

Answer 4

90-40 degrees of flexion

Question 5

What range of motion is safe in CKC post ACL?

Answer 5

0-60 degrees of flexion

Question 6

What is the criteria to begin dynamic stability training?

Answer 6

full extension, minimal effusion, flexion >100, QI>40%, no extension lab, gait w/o limp, and no AD

Question 7

What is the progression to running?

Answer 7

no AD, full ROM, pain free, no swelling, 80% quad strength, 2-3 months post op

Question 8

What is the progression to agility training and sports specific drills?

Answer 8

running without symptoms, 80% quad strength, performance on hop test >85% at 12 weeks, begins at half effort and progress to full effort, usually 3-6 months