Exam 2 Flashcards
What type of heat transfer is US
Conversion
3 types of US
Diagnostic
Therapeutic
Surgical
How deep does therapeutic US go
2-5 cm
What is US most commonly used for?
deep heating and biophysical effects
what type of tissue does US travel best through
Dense material
Ligaments, tendons, joint capsule, scar tissue etc.
What does frequency of US determine
depth, wavelength and temperature
1 MHz
goes deeper 2-5 cm
slower absorption
long wave length
3.3 MHz
shower wavelength
quick absorption
reaches only 2 cm
What is the effective radiating area
The inner portion that propagates sound
What is the beam non-uniformity ratio with US
the middle of transducer has the highest peak and the outside has less
Continuous mode for US
100% duty cycle
sound energy is constant
thermal effects
Pulsed Mode for US
10, 20, or 50% duty cycle
minimizes thermal effects
Thermal effects of US
increase metabolic rate for tissue healing
elevate motor and sensory nerve conduction (pain reduction)
Reduces spasm
Vasodilation
increased ROM
what is ultrasound not ideal for heating?
Muscles
how to increase thermal effects of ultrasound
Increase duration and/or increase intensity 1.5 watts/cm
non-thermal effects of US
increased skin and cell permeability
increased cell degranulation
increase phagocytic activity
increased rate of protein synthesis by fibroblast
Enhances wound healing
Clinical applications of non-thermal US
Edema
pain control
wound healing
Trigger points
Documentation of US
Frequency
Intensity
Duty cycle
time
location
transmission medium
Pt tolerance
results
phonophoresis
delivery of medicated lotion via ultrasound
“upgraded ultrasound and downgraded iontophoresis”
What level does TENS and Iontophoresis reach
sensory level
Contraindications for electrical modalities
cardiac pacemakers/ electronic implants
over carotid sinus
near venous or arterial thrombosis
over areas of indwelling phrenic nerve or urinary bladder stimulators
Direct current
continuous unidirectional flow of electrons
alternating current
uninterrupted bilateral flow of electrons
pulsed current
when electron flow is interrupted for milliseconds or microseconds
can be either AC or DC
Types of pulsed waveform
mono-phasic
biphasic- 2 phases with current flow in both direction
polyphasic
amplitude/intensity of wave form
distance the impulse rises above or below a baseline
duration of waveform
length of time to complete one wave
modulation of waveform
changes made in one or more aspect of the current (duration or amplitude)
Subsensory level of stimulation
no nerve fiber activation
no sensory awareness
sensory level of stimulation
non-noxious paresthesias
tingling
cutaneous A-beta nerve fiber activation
What level of stimulation do we typically stay in during TENS
Subsensory and sensory
Motor level of stimulation
strong tingling and pins and needles
muscle contraction
A-alpha nerve fiber activation
Noxious level of stimulation
strong
uncomfortable paresthesia
strong contraction
A delta and C fiber activation
Pulse duration/ width
length of time between beginning and end of all phases in a single pulse
commonly set to 50-150 usec for TENS
what does pulse duration determine?
Which types of fibers are stimulated
Short-sensory (less than 100)
longer- motor (more than 100)
longest-pain (more than 200)
What does frequency determine
type of muscle contraction that occurs
1-20 pps (subsensory and sensory)
20-40 (necessary for muscle contraction)
50-80 (creates tetany with significant fatigue
what is the average intensity that is tolerated?
35-80 mA
What is intensity responsible for
level of sensory and motor response
number of fibers being stimulated
What is TENS utilized for?
acute and chronic pain management
How is TENS beloved to decrease pain
by counter-irritant theory
creates a signal to counter pain that a person is feeling
Elements of TENS
Pulse duration - less than 150 is short
Frequency- Greater than 8- is high
amplitude is determined by patient
precautions of TENS
narcotic pain med usage
unclear diagnosis
general E-stim precautions
Contraindications for TENS
Driving
MG or MS (rapid fatigue)
Contralaterally- transthoracically
Children
Documentation for TENS
treatment parameters
electrode placement
Pain description
Change in occupational performance or biomechanics components
Conventional TENS
High rate
sensory
most commonly used for acute pain
effect doesn’t last ling
patient feels pins and needles
Motor TENS
low rate
sub-acute or chronic pain
Effects last longer
patient feels thump
Iontophoresis
Delivery of ions into body for therapeutic purposes
E-stim for medication delivery
Need referral and prescription
Causes of soft tissue injuries
minor and persistent repetitive trauma
Direct blunt trauma
Sudden uncontrolled and excessive overuse
What is a contusion
a region of inured tissue or skin in which blood capillaries have been ruptured
Early and later stage of contusion
Early- erythema
Later- swelling and loss of function
tx for contusion
prevent tissue form further injury
compression wrapping
MICE
Definition of a strain
damage of some part of contractile unit of muscle caused by overuse or over stress
Where does a strain occur
the weakest link of the muscle tendon unit
3 degrees of strain from lowest to highest
mild pulling without tearing
damage to a portion of the junction
complete rupture of the junction
Tx for acute strain
RICE for at least 1 week
muscle is vulnerable to re-injury
Later warm-up, stretch and resume activity as long as there’s no pain
Tx for chronic strain
High risk for re-injury so prevention is key
Gradually build ip activities including closed chain
Strain
involves ligamentous attachment
usually sudden
minor tears and hemorrhage without loss of joint stability
Grading for strain
similar to sprain
mild damage to complete ligament rupture (ACL tear)
tx for strain
protect ligament from stretch
gentle movements that maintain joint motion but do not reach full stretch
increase strength of surrounding musculature in case ligament is not back to full strength
Occult
occurs only when the joint is stretched or stressed, otherwise stable
no Pain or symptoms
Subluxation
joint loses some stability but maintains joint contact
3 degrees of joint instability
occult
subluxation
dislocation
Dislocation
joint stability is in jeopardy and the joint surfaces are not in contact
Late effects of dislocation
after 4 weeks
joint stiffness
recurrent dislocation
post-traumatic arthritis epically if further damage to capsule
When is immobilization always necessary
dislocation and sometimes subluxation
Effects of immobilization on soft tissue
stiffness and weakness of CT
loss of extensibility
atrophy and adaptive length changes in muscles
loss of fibers/shortening of fibers lead to contracture
How much stretch should you bring a client in for immobilization
some stretch but not into new pain
submaximal
olecranon bursitis
inflammation of olecranon bursa
caused by trauma or prolonged pressure on elbow
tx for olecranon bursitis
rest, avoid pressure on elbows, custom padding
Lateral epicondylitis
tennis elbow
insidious onset of pain over extensors felt at lateral epicondyle
aggravated by wrist flexion/extension with pronation or supination and gripping
Tests for lateral epicondylitis
Cozens test and Mill’s Test
Cozens test
provocative test
elbow stabilized by thumb
patient makes a fist and prints, radially deviates and extends wrist
Clinician resists wrist extension
Mill’s Test
passive elbow extension and wrist flexion
What tendons/muscles are most commonly effected during lateral epicondylitis
extensor digitorium
Extensor carpi ulnaris
tx for Lateral epicondylitis
stop doing what makes it hurt
NSAIDS
US
compression brace
activity modification
What muscles are involved for medial epicondylitis
pronator tires and flexor capri radialis
sometimes FCU and PL
Medial epicondylitis cause
throwing athletes
repetitive trauma
Testing for Medial Epicondylitis
resistive wrist flexion with pronation
elbow extension with passive wrist extension
decreased grip strength
What should be ruled out when testing for medial epicondylitis
UCL rupture
Cubital tunnel syndorme
Tx for medial epicondylitis
similar to lateral epicondylitis
Tinels sign
tingling or prickling sensation elicited by tapping injured nerve trunk
if positive nerve, if negative tendon
symptoms of overuse syndromes of muscles
vague diffuse pain
cramping
fatigue
loss of strength and control for an extended period of time
tx for overuse syndromes of muscles
rest until symptoms subside
modalities to decrease pain
progressive exercise and strengthening programs
Where is compartment syndrome most common
volar compartment
When does compartment syndrome occur
sustained excessive pressure develops in one of the 3 forearm compartments following acute trauma
Signs and symptoms of compartment syndrome
Significant swelling
severe pain not relived with immobilization
tense to palpation
Tx for compartment syndrome
rest
modalities
progress to exercise
faciotomy if blood is not getting to hand
Tendonitis and stenosing tensosynovitis
inflammation of tendons leads to fibrosis
structures become thick, unyielding and restrictive to tendon excursion
tendon will not be able to slide through sheath/retinaculum
tx for tendonitis
initially conservative
edema management
gentle exercise