Automatic Human Knee Cartilage Segmentation From 3-D Magnetic
Collisions and Injury - Physics at St James Collegiate€¦ · Knee and Leg Fact: 75% of sports...
Transcript of Collisions and Injury - Physics at St James Collegiate€¦ · Knee and Leg Fact: 75% of sports...
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Collisions and InjuryPart 2
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Why do we see stars when we get hit in the eye?
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Injury Anytime there is a collision in sports, there is always
some amount of deformation.
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When an object hits your body
1. Compress and activate nerve endings
Example: fist in eyeball activates retinal neurons = see
stars!!
2. Break skin and rupture veins beneath = bleeding
3. Rupture veins without breaking skin = bruising
4. Stretch/ tear tendons, ligaments, or muscles = strain,
sprain
5. Twist or misalign joint = dislocation
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Injury Why do injuries swell?
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Pain Physiological – pain fibers – everyone has a different
amount
Psychological – attitude – panic “secondary gain”
Ex attention
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Pressure Force per area
Examples:
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Pressure Protective padding is designed to distribute force over
a larger area.
Example
Fact: A punch to the head can cause it to accelerate at 80g’s!
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Feet Your foot has 2 arches that act as a spring to store
energy each time you step. Misshapen feet (low or high
arches) result in problems for athletes that can be
corrected with orthotics.
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Feet Good shoes are important prevention for foot injuries,
they help absorb the shock, but only work for 60 miles!
Different features are important for different sorts:
Tennis – lateral support
Running – shock absorption
Feet can effect knees – hips – pelvis - back
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Feet Good running surface is also important:
Worst: concrete, pavement
Best: hardwood, gravel
Astroturf – good or bad?
Good: harder surface, better friction
Bad: results in more injuries to toes and knees.
Many injuries happen on Astroturf even when no one is
near, the surface is just so unforgiving.
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Knee and Leg Fact: 75% of sports injuries involve the knee.
Sudden stops or lunges tear cartilage in the knee,
which doesn’t heal well. (sometimes it’s just removed)
Runner’s knee – uneven wear of cartilage caused by
overtraining.
ACL (anterior cruciate ligament) is often torn in knee
injuries and doesn’t heal.
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Knee and Leg Prevention: stretch, good shoes, strengthen leg
muscles
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Spinal Cord and Neck Spinal cord transmits info
from brain to body and back
Cannot be repaired
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Brain If the brain smashes against the side of the skull, the
result can be instant death. Brain rotation in the skull
can cause veins and nerves to stretch or tear. If a vein
ruptures in the brain, the leaking blood compresses the
brain resulting in death in minutes, hours, or days. A
more minor injury can result in amnesia, loss of motor
skills, or emotional disturbance.
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Brain “punch drunk” – poor coordination, paranoia, tremors
10-15% of boxers become punch drunk