MG3


Fichier Détails

Cartes-fiches 343
Langue English
Catégorie Médecine
Niveau Université
Crée / Actualisé 07.12.2020 / 15.01.2021
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What is the main function of a socket?

TO secure a comfortable fit and to transfer the loads experienced in using the prosthesis

What is the main function of a harness?

To secure the prosthesis and socket, and anchor the prosthesis under all loading conditions and to give a stable refernce point for a control signal

Which features are desirable for a harness?

Lightweight, broad, flexible, not too absorbent, easily cleaned, easy to don and doff, durable, comfortable.

What are the advantages of a volar plate?

It is lightweight, it can be used to grip objects between the plate and the residual forearm, it is easily portable, good sensory feedback is available when using a volar plate

What are the advantages of a split hook?

It is lightweight, ireliable/robuts, it can be used to perform a wide variety of manipulative tasks, it provides good feedback via the operating cable, it allows good visual feedback

What are the advantages of a mechanical hand?

cosmesis, it is good at gripping large or rounded objects

What improvements could be made to electrically-powered artificial hands?

Weight reduction, indreased cosmesis, better control, more feedback, improved gripping

Which units are used to reate the capacity of a battery?

The capacity of a battery is rated in milli-amp hours

What are the advantages of NiMH batteries over NiCad batteries?

NiMH batteries have a better energy-to-weight ratio and are more envireonmentally friendly than NiCad batteries

How do "smart chargers differ from conventional barrery chargers?

Smart chargers first discharge batteries before starting the changing process thus preventing the battery developing a "memory" of ist charge history.

What is the one main disadvantage of cable-operated body-powered prostheses?

The wear and tear on clothing

What are myoelectric transducers?

Myoelectric transducers are both electrodes and amplifires, mounted within a prosthesis socket to detect electrical signals in the muscles of the residual limb

What are the disadvantages of the use of PVC to make "gloves" for a prosthetic hand?

It stians easily, it is discouloured by UV light.

Functional model of normal physical activity

Articulated lever, a source of motion, awareness of need and action, control of motion, control of energy

List the five elements of Perry's functional model of physical activity

Articulated lever, a source of motion, awareness of need and action, control of motion, control of energy

Which tissues are responsible for maintaining the integrity and limiting the motion of joints?

The ligaments are responsible for maintaining the integrity and limiting the motion of joints

Specify the tissues which act as a source of motion

The muscles, efferent pathways of the lower motor neurones and their myoneural junctions act as a source of motion.

Structural insufficiency

The integrity of any of the structural elemnts of the body, and their capacity to transmit force in a normal manner, is impaired. For examples: fracture, deformities…

Motor insufficiency

The inability to produce joint motion. From trauma or neurological conditions.

What is the possible undesirable consequence of compensatory manoeuvres adopted by a patient with a structural insufficiency?

Excessive loading of unimpaired tissues leading to fatigue and degeneration.

What are the two main causes of motor insuffiency?

Trauma or neurological disease

Why is particular care required when fitting orthoses to patients with a sensory impairment?

To avoid creating high pressures which are undetectable.

Control dysfunction

Upper motor neurone lesions, including brain injuries, will result in muscle control dysfunction

Energy insufficiency

Any pathological condition which adversely affects the funtion of the cardiovascular and/or pulmonary systems.

What are the two principal groups of patients who exhibit a control dysfunction?

Adult stroke patients and children with cerebral palsy

What are the two elemts of abnormal joint control which contribute to an equino-varus position of the foot?

Excessive ankle plantarflexion and subtalar supination.

List and explain the three main categories of control disorder in children with cerebral palsy.

Hemiplegic (one-sided), diplegic (both lower limbs), quadriplegic or tetraplegic (all four limbs).

List the six principal factors covered by the physical examination performed prior to orthotic prescription.

Joint ranges, stability and alignment; skeletal integrity and alignment inclunging length; muscle poser and control; sensation, proprioception and balance; vascular status and skin condition; location and cause of pain.

Describe the five points on the MRC Grading of muscle

0=no activity; 1=flicker of activity; 2=power with gravity excluded; 3= power against gravity; 4= some weakness of power;5=normal power

Specify four essential elements of a description of gait deviation

Joint segment; plane of movement; phase of gait cycle; nature of abnormality

List the six functional hand position

cylindrical grasp; tip pinch; hook pinch; palmar pinch; spherical grasp; lateral pinch

Specify four possible clinical onjectives of treatment which might be achieved orthotically

To relive pain, to protect tissues, to manage deformity, to reduce tissue loading, to improve function, to improve appearance, to compensate for deficiency, to compensate for abnormal muscle function, to promote healing

Suggest four different methods of treating a spastic equino-varus deformity

surger, physio-therapy, drugs, orthotics

List five considerations other than the required function which will influence the choice of components and materials used in the constructions of an orthosis

Importance of cosmesis, presence of oedema, presence of sensory or vascular deficit, ability to doff and don, level and duration of use, enviroment, presence of incontinence.

orthosis

An externally applied device used to modify the structural and functional characteristics of the neuromuscular and skeletal systems

orthotics

the science and art involved in treating patients by the use of orthoses

What are the sources of the external forces which the body is subjected to during normal physical activities?

Gravity and acceleration of body segments

What body tissue would normally be responsible for resisting a moment in the sagittal plane at the level of the knee joint

Knee flexor and extensor muscles

When one or other of the normal body tissues is impaired and unable to perform ist normal role, how is this normally apparent?

abnormal gait pattern

What are the three "direct" ways in which an orthosis may modify the forces and moments acting across a joint?

Control of moments, control of normal forces, control of axial forces