Week 2 - Mechanisms of Sports Injuries Flashcards

1
Q

Mechanisms?

A

how force is applied and resulting trauma

Biomechanics deviations

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2
Q

Stress

A

Tissue load (force)

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3
Q

Strain

A

Tissue deformation (change in shape) due to load

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4
Q

Stiffness?

A

Relationship b/w stress/ stress = Ability of tissue to resist load (stress/ strain) - SLOPE

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5
Q

Stress/ Strain Curve details?

A

Elasticity = ability for tissue to return to shape after deformation

Yield Point = elastic limit of tissue - permanent changes occur

Ultimate Strength Point = highest stress a tissue can withstand before failure

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6
Q

Occurrence of Injury?

A

Once there is mechanical failure and tissue can’t withstand stress and strain

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7
Q

2 Forms of Tissue Failure?

A

Load to Failure = Rupture/ # –> continuous force until break

Fatigue Failure = Subthreshold load repetition results in fatigue -> plastic region. No acute force - Chronic - Stress #.

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8
Q

Types of Load?

A

Compression
Tension
Shearing
Bending
Torsion

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9
Q

Models of Injury?

A

Acute vs Chronic

Different mechanism of time frames both relate to stress/ strain curve

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10
Q

Acute injury?

A

Load to failure
Immediate
One external load creates enough stress to exceed failure tolerance (yield point)

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11
Q

Chronic Injury?

A

Repeated load or constant load
Fatigue to Failure
dvlp over time
over use

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12
Q

Strain Injury?

A

Stretch/ rip/ tear in msc, tendon, or msctendon junction

Pain on active mvm (contraction)
Pain on active or passive stretch

Common during eccentric

Two joint mscs most susceptible

Edema is common

Can also be hematoma

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13
Q

Grading of Strains?

A

1 = some stretch/ tear. tender/ pain w/ active mvm, Full ROM

2 = more fibers stretched/ torn. Pain w/ active mvm. Swell, ecchymosis, decreased ROM

3 = complete rupture, significant decrease mvm, intense pain but then decreases. 6-8 weeks

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14
Q

Ecchymosis?

A

Bruise

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15
Q

Cramps?

A

involuntary msc contraction b/c lack of water / electrolytes

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16
Q

Msc Guarding

A

msc contraction in response to pain/ injury –> protect injured area

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17
Q

Spasm

A

involuntary contraction causes increased tension/ shortening of msc that interferes w/ voluntary mvm.
Clonic = involuntary contract and relax
Tonic = constant contract

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18
Q

DOMS?

A

12 hours after exercise
24-48 hours
resolves in 3-4 days
micro tears in msc

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19
Q

Tendinopathy?

A

Injury to tendon
- need to warm up to decrease pain but next day after activity pain increases

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20
Q

3 forms of Tendinopathy?

A

Progression from 1-3
2 and 3 have same treatment
1) Tendonitis = inflamed tendon - swell, pain, tender, warm, crepitus

2) Tendonosis = tendon breakdown w/ out inflammation.
Degeneration b/c of overuse

3) Tenosynovitis = inflammation of tendon/ synovial sheath (crepitus + increased friction against bone)

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21
Q

What type of injury is a Tendonopathy? Describe why.

A

Overuse injury

Tendons need 2-3 days to recover
- Mechanical loading causes collagen synthesis and degradation.
- Repetitive loading (w/in 1first 24 hrs) causes more degradation than synthesis

Synthesis lasts longer than degradation so you get a net synthesis (rebuild) unless overuse –> THERE IS A GRAPH for PROTEIN SYNTHESIS

22
Q

Treatment of Tendonopathy

A

Don’t do nothing or just push through

Load management is essential

Pain should be at 3/10 during activity

Start w/ isometrics –> then eccentric –> progress to concentric –> then compressive (add load) –> then plyometric loading –> then plyometric w/ compression

Always consider the causes on injuries and determine if change is needed

23
Q

Stress Shielding Theory?

A

Believes Eccentric mvm is best for tendon rehab

Mscs function as shock absorbers during eccentric contractions
–> Therefore, reduced absorption/ load on tendon

24
Q

Myofascial Trigger Points?

A
  • Hyper sensitive points within msc or fascia
  • Often in posture mscs
  • acute or repeated micro trauma

Latent TP = pain only w/ direct pressure (may limit ROM/ cause weakness)

Active TP = pain at rest (pressure causes jump sign). Referred pain

25
Myofascial Trigger Points?
Massage TP release Stretch Correct msc imbalance
26
contusion rehab?
= a bruise ecchymosis = change in skin color Light stretching (decreases myositis ossficans = calcium deposits in msc) No deep tissue massage
27
Synovial Joint Characteristics/ Components?
- Acrticular (hyaline) cartilage lines bones - Joint capsule (inner surface = synovial membrane - high vascularized, produce synovial fluid - lube, absorb, nutrition) Ligaments (main structure for joints) - can be part of capsule or separate
28
What is a sprain and grading?
Tensile injury to Ligs. when stress causes a joint to move beyond normal ROM G1 = some stretch/ separation of fibers, minimal instability, mild pain, localized swell, stiff G2 = Tear/ separate fibers, moderate instable/ pain/ swell/ stiff. G3 = Total tear, Instable. Severe pain then decreases, swell and stiff.
29
S&S for Sprain?
Joint Effusion (blood/ synovial fluid) Heat Ecchymosis Tenderness on palpation Swellin starts gradually (low BS) Immediate pain (lots of nerves) More pain w/ passive mvms
30
Healing abilities and rehab for sprains?
- Ligs. heal poorly (low blood supply) - Rehab relies on strengthening/ training surrounding structures (mscs/ tendons). - Can't train a lig.
31
Dislocation?
Bone forced out of joint and stays out - deformity/ asymmetry - Relocatiing not in our scope - splint in current condition - send to hospital
32
Subluxation?
Bone forced out and back into joint - pain and instability - stretched/ torn ligs., nerves, mscs, joint capsule
33
Osteoarthritis?
Chronic - degeneration of articular cartilage = changes in subchondral bone due to micro trauma - Usually in weight-bearing joints - S&S = stiff, swell, pain - Previous trauma increases risk - Cartilage doesn't have blood supply = low healing - No cure
34
Bursitis?
acute or chronic inflammation of bursa Bursa = synovila fluid sack to decrease friction Irritation results in increased fluid production causing pressure and pain
35
Bone Characteristics?
Support, protect, mvm, calcium storage, produce RBCs Compact bone (outer core w/ blood/ lymphatic vessels + nerves) Cancellous bone (porous, epiphysis) Metaphysis = growth plate (cartilage - weaker) Osteoclasts break down Osteoblasts build new Peak mass in 20s
36
2 Broad categories of Bone fractures(#)?
Simple/ closed = # under skin Compound/ open = # through skin
37
Greenstick #
in not fully ossified bone (kids)
38
Linear #
in straight line parallel to shaft
39
Transverse #
perpendicular to shaft
40
Oblique #
Angled # (torsion/ bending)
41
Spiral #
Twisting
42
Impacted #
Compression of bone causes Telescoping
43
Avulsion #
Bone fragment attached to tendon or ligament
44
Comminuted #
3 or more # sites
45
Stress # causes?
Chronic - msc overload on bone - Improper distribution of stress by bone - Repetitive stress - Change in surfaces or foot wear (grass to floor) - overtraining - start training too fast - R2P too soon - Genetics Bone absorption occurs faster than reformation
46
Stress # S&S?
Early Stage - localized tender/ pain Late Stage - Pain w/ activity, constant pain, night pain, percussion test
47
Shin splints vs stress #?
Shin Splints = Medial Tibial Stress syndrome - msc pulling away from bone
48
Osteochondrosis?
Chronic conditions in teens - Degradation of bone ossification centres during rapid growth - Unknown cause (maybe avascular necrosis)
49
Nerve Injuries?
Acute or Chronic - Change in sensation (hypoesthesia or hyperesthesia) - Numb or tingling - Sharp or burning pain - Regeneration is slow (3-4 mm/ day)
50
Neuropraxia?
Mild blunt force temporarily stops nerve conduction (funny bone)
51
Neuritis
Inflammation of the n. (sciatica)
52