Tissue injury/ healing

Question 1

2 determining factors of injury

Answer 1

1. magnitude of force

2. material/properities of tissues involved

Question 2

Strain vs stress

Answer 2

strain- to pull/stretch

stress- force divided by the area over which force acts

Question 3

tensile force

Answer 3

• longitudinal tearing stress (usually tendons/muscles)

Question 4

Compression force

Answer 4

Stres @ each end of the structure

Question 5

Shear force

Answer 5

force occurs perpendicular across the axis of structure

Question 6

torsion force

Answer 6

twisting force

Question 7

1st stage of soft tissue healing symptoms and time frame

Answer 7

Inflamatory stage ( 0-6 days)

S+S- SHARP (swelling, heat, altered function, redness, pain)

-large addition of RBC due to capillary permiability, white blood cells also come

Question 8

2nd stage of soft tissue healing time frame

Answer 8

proliferation stage- 3-42 days

• macrophages help clean debris
• with debris out of way collagen laced down by fibroblasts(not very strong

Question 9

3rd stage of soft tissue healing

Answer 9

maturation stage- 3w- 1yr

remodelling of fibrous matrix to form mature scar tissue (not vascular, less functional/ flexible)

-decrease H20 and blood flow

Question 10

Bone healing

Answer 10

1. new blood vessels, fibrocartilage form
2. 1st week early bone growth
3. 3 weeks- increased osteoblastic activity, callus forms