General Px Flashcards
During normal human locomotion, how many inches does the center of gravity shift from side to side
2
Center of gravity in adult male
2nd sacral vertebra
To minimize lateral bending of the trunk subsequent to unilateral hip abductor weakness, it is best to use
A cane on the uninvolved side
Body’s center of gravity reaches its highest point at
Mid-stance
Pressure is determined by
Force divided by areea
Normal gait, between heel contact and foot flat, the floor reaction force tends to cause which moments at the hip and knee
Hip flexion and knee flexion
If the sciatic nerve is severed at the level of the lesser trochanter, muscle function will not be impaired at the
Hip joint
Muscles which pass posterior to the medial malleolus at the ankle act to
Invert and plantar flex the foot
Biceps femoris
Flexes the knee joint
Bones that form the acetabulum
Ilium, Pubis, and Ischium
Normal hip reaches its maximum extension during
Heel-off
The iliopsoas inserts on the
Lesser trochanter
Major function of the iliac crest in a hip disarticulation
Provide an area for suspension
In a Canadian HD socket, what is not affected by A-P placement of the hip joint
Lateral stability during stance phase
With respect to the hip and knee joints at midstance, the floor reaction line for a hip disarticulation Px passes
Posterior to hip, Anterior to knee
During ambulation, instability of the knee at heel strike with a hip disarticulation Px may be caused by
Heel sedge that is too hard
The symphysis pubis is
The anterior junction of the pelvic bones
Immediate post-surgical fitting of upper limb amputee offer what advantages (3)
-Early maturation of the RL
-More rapid rehabilitation
-Early return of 2-handed grasping patterns
*NOT greater residual ROM
Pt with loss of thumb only would probably benefit most from
An opposition post
Mechanical partial hand Px would probably be contraindicated for a transmetacarpal amputation with
The thumb and index finger remaining
Amount of residual supination and pronation retained by a wrist disarticulation Pt while wearing a Px should be at least
50%
TD offers the best tool handling capabilities
Dorrance 7 (farmer’s hook)
What would cause decrease pronation and supination in a wrist disarticulation Pt
Proximal trim line is proximal to epicondyles
Supination and pronation of the forearm occur where
Proximal radioulnar
Which muscle is missing in the medium length BE
Pronator quadratus
What is not part of the BE figure-of-eight harness
Lateral suspension strap
If a BE Px is harnessed with a split cable housing, which Px joints has most likely been utilized
Step-up hinge
A BE Px with flexible hinges should not inhibit flexion at the elbow more than
10 deg
Primary advantage of a voluntary closing TD
Graded prehension
Which component provides the greatest ROM for bilateral BE amputee
Wrist flexion unit (Sierra type)
Loss of the upper limb just distal to the supinator muscle will result in what amputation level
Short BE RL
Modification (2) is made to the figure-of-eight harness for bilateral BE Pt
The axilla loops are unnecessary and a cross back strap is added
When a voluntary opening Px hand is activated, the cable replaces function normally provided by the
Extensor carpi radialis longus and brevis
Prehension patterns (3) provided by a Px hand
Cylindrical, spherical, and palmar
Main supinator of the forearm
Biceps
An excursion amplifier incorporated in a control system provides increased cable excursion at the expense of
Requiring more force
When the elbow flexion attachment of the AE forearm is moved toward the TD, it will have what mechanical effect
Decrease force and increase excursion required
Characteristics (4) of the ED amputation
-Provides rotational stability
-Preserves a long lever arm
-Prevents bony overgrowth
-Leaves the epiphyseal plates intact
AE amputation is sometimes performed for a complete brachial plexus injury. What other steps would be helpful
Shoulder fusion
Brachioradialis muscle acts primarily to
Flex the elbow joint
The Px designed for a Pt with a proximal femoral focal deficiency (PFFD) generally utilizes ischial and gluteal WB because
Hip joint is unstable or non-existent
Main hip flexor
Iliopsoas
