STRESS FX

Question 1

stress fx

Answer 1

-any fx/microfx taht happens as a result of repetitive cyclic insults and not traumatic event

Question 2

fatigue fx

Answer 2

-happens in normal bone when icnrased stress occurs (most common)

Question 3

Insufficiency/fragility fx:

Answer 3

-happens in abnormal bone weakened by underlying disease/ condition w/out increase in stress

Question 4

pathological fx

Answer 4

-happens in weakened bone by massive invasive disease (like osteomyelitis)

Question 5

intrinsic factors of why pts get stress fx

Answer 5

• foot type
• prolonged nwb-> dec density of bone
• mineral issue (low vit D)
• estrogen/hormones
• dec testosterone in men
• gender

Question 6

how do biomechanics and stress fx relate?

Answer 6

-external: training regimen
internal: anatomy issues which lead to biomech issues
-ex: metatarsus adductus -> lateral metatarsal stress fx
also, long 2nd met, bunion, equinus, flat/high arch

Question 7

what extrinsic factors lead to stress fx?

Answer 7

• overuse of foot hitting distance running
• training regimen cause when muscles are overtired they cant lessen shock of repeated impacts and msucles will transfer stress to bones and increased forefoot loading
• nutrition/medications

Question 8

female triad

Answer 8

• females more prone to stress fx> males
• eating disorders
• irregular period
• osteoporosis

Question 9

why is navivular common site for stress fx?

Answer 9

• central 1/3 most common site due to vascular supply and shear forces of 1/2 mets
• also talus pressure
• treat: NWM: 6 weeks
• if hopping recreates pain- navicuar fx