Exam 1 Flashcards
Roles and Responsibilities of Athletic Trainers
Injury/illness prevention and wellness protection
Clinical evaluation and diagnosis
Immediate and emergency care
Treatment and rehabilitation
Organizational and professional health and well-being.
NATA Code of Ethics
Members shall respect the rights, welfare and dignity of all.
Members shall comply with the laws and regulations governing the practice of athletic training.
Members shall maintain and promote high standards in their provision of services.
Members shall not engage in conduct that could be construed as a conflict of interest or that reflects negatively on the profession.
Trauma
A physical injury or wound that is produced by and external or internal force.
Load
An external force acting on tissues that causes internal reactions within the tissues.
Stiffness
The relative ability of a tissue to resist a particular load. The greater the stiffness, the greater the magnitude of load it can withstand.
Stress
The internal resistance of the tissues to an external load is called a stress.
Strain
Extent of deformation of tissue under loading.
Deformation
Change in shape of a tissue.
Elasticity
A property that allows a tissue to return to normal following deformation.
Yield Point
The yield point is the elastic limit of a tissue.
Plastic
Plastic is the deformation of tissue that exist after the load is removed. (permanent changes)
Creep
Deformation of tissue that occurs with application of a constant load over time.
Mechanical Failure
Exceeding the ability to withstand stress and strain, causing tissue to break down.
Tissue Loading Types
- Compression
- Tension
- Shearing
- Bending
- Torsion
Compression
Compression is produced by external loads applied toward one another on opposite surfaces in opposite directions.
Tension
(opposite of compression)
Tension is the force that pulls or stretches tissue. The structure elongates and tensile stress and strain results.
Shearing
Shearing occurs when equal but not directly opposite loads are applied to opposing surfaces, forcing those surfaces to move in parallel directions relative to one another.
Bending
Bending can occur in one of the following ways:
- When two forces pairs act at opposite ends of a structure (4-point)
- When three forces cause bending
- When an already bowed structure is axially loaded.
Torision
Torsion loads caused by twisting in opposite directions fro the opposite ends of a structure cause shear stress over the entire cross section of that structure.
Traumatic
(Acute) Sudden
Overuse
(Chronic) Overtime, due to repetitive movements and poor biomechanics.
Musculotendinous Unit Injuries
The musculotendonuos unit consist of the muscle, the tendon, and the fascia that surrounds the muscle.
High incidence in athletic. Anatomical Characteristics -irritability/excitability -contractility -Conductivity -Elasticity
Types of Muscle
- Cardiac
- Smooth
- Striated (Skeletal)
Muscle Strains
A stretch, tear, or rip in the muscle or its tendon.
Pathologically, a strain is very similar to a contusion or sprain with capillary or blood vessel hemorrhage.
Time required for healing may be lengthy
Often involves large, force-producing muscles.
Treatment and recovery may take 6-8 Weeks depending on severity.
Return to play too soon could result in re-injury.
Muscle Strain Grade I
Grade I - some fibers have been stretched or actually torn resulting in tenderness and pain on active ROM, movement may be painful but full range is present
Muscle Strain Grade II
A number of fibers have been torn and active contraction is painful, usually a depression or divot is palpable, some swelling and discoloration result, but may not occur immediately. Usually patient hears a popping sound.
Muscle Strain Grade III
A complete rupture of muscle or musculotendinous junction. There is significant impairment to or perhaps total loss of movement. Initially there is a great deal of pain that diminishes due to nerve damage.
Muscle Cramps
Painful and involuntary skeletal muscle contraction.
Occurs in well-developed individuals when muscle is in a shortened position.
Muscle Gaurding
A muscle contraction in response to pain.
Following injury, the muscles that surround the injured area contract to, in effect, splint that are, thus minimizing pain by limiting movement.
Muscle Spasm
A muscle spasm is a reflex reaction caused by trauma to the musculoskeletal system.
Clonic Spasm - involuntary muscle contraction characterized by alternate contraction and relaxation in rapid succession.
Tonic - Type of muscle contraction characterized by constant contraction that last for a period of time.
Muscle Soreness
Muscle Soreness is pain caused by overexertion in exercise.
2 types of muscle soreness:
Acute-onset muscle soreness -this type of muscle soreness accompanies fatigue. It is transient and occurs during and immediately after exercise.
Delayed-onset Muscle Soreness - this type of soreness appears approximately 12 hours after injury/exercise. It become most intense 24 to 48 hours and then gradually subsides, so that muscle becomes symptom free after 3 to 4 days. Potentially caused by slight micro-trauma to muscle or connective tissue structures.
Tendon Injuries
The tendon contains wavy, parallel, collagenous fibers that are organized in bundles surrounded by a gelatinous material that decreases friction. The collagen fibers straightens during loading byt then return to their shape after loading.
Breaking point occurs at 6-8% of increased length.
Tears generally occur in muscle and not tendon.
Repetitive Stress on a Tendon
Repetitive stress on a tendon will result in microtrauma and elongation, causing fibroblast influx and increased collagen production.
Repeated microtrauma may evolve into chronic muscle strain due to re-absorption of collagen fibers
Results in weakening tendons
Collagen re-absorption occurs in early periods of sports conditioning and immobilization making tissue susceptibility to injury - requires gradual loading and conditioning.
Tedonitis
One of the most common overuse injuries. Has a gradual onset, with diffuse tenderness due to repeated microtrauma and degenerative changes.
Inflammation of the tendon
Obvious signs of swelling and pain.
The key to treatment is rest.
Crepitus
Crepitus is a crackling feeling or sound.
It is usually caused by the tendon’s tendency to stick to the surrounding structure while it slides back and forth. This sticking is primarily caused by the chemical products of inflammation that accumulate on the irritated tendon.
Tendonosis
The breakdown of a tendon without inflammation (tendon degeneration).
Without proper healing tendonitis may begin to degenerate and result in tendonosis.
-osis
means there is chronic degeneration without inflammation.
Tenosynovitis
Inflammation of a tendon and its synovial sheath.
In acute case - rapid onset, crepitus and diffuse swelling.
Often occurs in long flexor tendon of the digits and the biceps tendon.
Tendinopathy
Disease of a tendon, usually used to refer to either tendonitis or tedonososis.
Myofascial Trigger Points
A myofascial trigger point is a discreet, hypersensitive nodule within a taut band of skeletal muscle and/or fascia.
Trigger points develop as the result of mechanical stress.
- either acute trauma or microtrauma
- may lead to development of stress on muscle fiber = formation of trigger points.
Latent Trigger Points
Does not cause spontaneous pain.
May restrict movement or cause muscle weakness.
Become aware of presence when pressure is applied.
Active Trigger Points
Causes pain at rest
Applying pressure = pain = jump sign (crying out, wincing or withdrawing.
Tender point vs. Trigger point
Found most commonly in muscles involved in postural support
Contusion
Compression of soft tissue that results in bleeding into surrounding tissues.
Is a result of a sudden blow to the body and can be both deep and superficial.
Hematoma results from blood and lymph flow into surrounding tissues.
- localization of blood into clot, encapsulated by connective tissue
- Speed of healing dependent on the extent of damage.
Chronically inflamed and contused tissue may result in generation of calcium deposits (myositis ossificans)
Atrophy
Atrophy is wasting away of muscle due to immobilization, inactivity, or loss of nerve functioning.
Contracture
Contracture is an abnormal shortening of muscle where there is a great deal of resistance to passive stretch.
Generally the result of a muscle injury which impacts the joint, resulting in accumulation of scar tissue.
Synovial Joint
Synovial Joints are articulations of two bones surrounded by a joint capsule lined with synovial membrane.
Synovial joints include:
- Hyaline and/or articular cartilage
- Fibrous connective tissue capsule
- Ligaments
- Capsule with synovial membrane
- Joint cavity with synovial fluid
- Blood and nerve supply
- Muscle
- Menisci (fibrocartilage)
What is on the ends of the articulating surfaces?
Hyaline or articular cartilage
Joint capsule
All joints are entirely surrounded by a thick ligamentous joint capsule.
The inner surface of this joint capsule is lined by a very thin synovial membrane that is highly vascularized and innervated.