ABCOP Prosthetic Written Exam With Correct Answers

When walking, the normal foot should pass close to the AK prosthetic foot: - Answer to facilitate shift of body weight The knee bolt of the prosthesis is usually found to be: - Answer In approximately 5 degrees of external rotation When Adductor longus tightness is observed during initial fitting of the AK socket you should: - Answer Flare and contour anterior-medial corner The suction socket prosthesis is aligned so that involuntary alignment stability is minimized and voluntary knee control by stump action is emphasized: - Answer In order that a minimum amount of energy is consumed during walking Medial whip is caused by - Answer Excessive lateral rotation of knee bolt if the ischial seat of the ak socket is made too wide, it will cause - Answer Excessive pressure on the hamstring muscles, resulting in stump edema Which one of the following gait faults is due to incorrect function of the prosthesis? - Answer Circumduction At push-off it is common for an AK amputee with well developed hamstring muscles to force himself off the ischial seat as his stump extends. How can this trouble be avoided? - Answer Align the socket in a position of initial extension What is the effect of excessively shimming the dorsiflexion stop to place the shank in a vertical position? - Answer Excessive shortening in range of plantar flexion, resulting in stiffened plantar bumper action and knee instability During swing phase, a tendency for the AK prosthetic shin to make a marked inward movement of the knee accompanied by an outward movement of the foot is called: - Answer Lateral whip When hamstring muscle tightness is observed during initial fitting of the AK socket you sould: - Answer Roll and relieve the medial posterior wall Patient weighs 200 lbs. The length of the lever arm between center of gravity and support point on his socket is 6 inches. The length of the lever arm form support point to midpoint of femur is 10 inches. How many inch pounds of force must be distributed on his femur to prevent ML instability? - Answer 1200 The Latissimus dorsi and the supraspinatus are the prime movers in the glenohumeral extension: T/F - Answer False If a patient with 65% length BE can flex elbow to 90, the use of a step-up hinge is indicated: T/F - Answer True The rhomboids originate on: - Answer Thoracic vertebrae and insert along the scapula from the root of the spine to the inferior angle External rotation of humerus is accomplished with the: - Answer Infraspinatus & Teres Minor Internal rotation of the humerus is produced by contraction of the: - Answer Subscapularis The greatest disadvantage to the amputee in using any step-up hinge is: - Answer loss of flexion power in forearm The triceps not only extends the elbow joint but also: - Answer Extends the glenohumeral joint The shoulder disarticulation prosthesis is operated primarily by what control motion? - Answer Scapular abduction If the AE Amputee is having difficulty in flexing the elbow of his prosthesis he would be aided least by: - Answer Replacing a steel hook with an aluminum one The lever type excursion amplifier provides increased excursion at the expense of - Answer Force External-moveable-sheave-type excursion amplifier is used with what type of prosthesis? - Answer Shoulder Disarticulation What does the nudge control enable the amputee to do? - Answer Lock and unlock the elbow by pressing lever with the chin When making a plaster wrap for a VSBE split socket or Meunster, the elbow is flexed: - Answer 90 degrees What is the chief advantage of using the housing cross bar assembly? - Answer Enables the amputee to use the same cable to lock the elbow and operate the terminal device When using the single pivot hinge, the center of the joint is places 1/2" above the medial superior brim of the socket. T/F - Answer False What are 2 friction wrists? - Answer WE-500 & WA-600 In the forearm the ulna remains stationary while the radius rotates around it. T/F - Answer True In the stable anatomical elbow joint, the only motion that takes place between the forearm and humerus is flexion and extension. T/F - Answer False Triple control simply means there is one cable for elbow flexion, one cable for terminal device operation, and a third for elbow locking. T/F - Answer False The E-400 elbow is set up in 5-10 degrees of initial elbow flexion. - Answer True The FM Wrist Disconnect is not recommended for use on: - Answer Short AE amputees The triceps pad is often used for: - Answer Shore AE The polycentric hinge is used on which type of amputees? - Answer Elbow disarticulation The basic BE control motion is gleno-humeral: - Answer Flexion The acceptable range of gleno-humeral flexion for AE prosthesis application is: - Answer 90 degrees In what position should the muscle tunnel be when assembling the control system of the biceps cineplasty? - Answer at rest length When teh elbow is flexed to 90 degrees, the forearm can be rotated through an arc by humeral rotation. The size of this arc is: - Answer 140 degrees Amputation level for wrist loss, forearm rotation absent, good humeral rotation, good shoulder motion: - Answer Elbow disarticulation what percentage of loss of elbow flexor power results from severance of the biceps tendon? - Answer 25% The terminal device most desirable for use with cineplasty amputees is: - Answer According to the tunnel's strength and excursion In which portion of stance phase is the prosthetic side in knee extension most likely to occur? - Answer Mid-stance The purposes for wearing prosthetic socks are: - Answer 1) volume management 2) shock absorption 3) skin shear management The PTB cuff suspension strap derives its suspension over which area: - Answer proximal patella Redundant tissue is described as - Answer excessive soft tissue The AP measurement of a BK is taken in flexion at: - Answer 20 degrees What are 2 advantages in using a test socket? - Answer 1) Identify high pressure areas 2) Ensure loading of pressure tolerant aresas In order to obtain optimum M/L stability of the PTB type prosthesis during locomotion: - Answer Observe that socket displaces laterally not more than 1/2" during midstance In dynamic alignment, lateral gapping at the socket brim is reduced by: - Answer Sliding the socket medially In dynamic alignment, if the knee is forced forward and knee flexion is exaggerated at heel contact, it indicates: - Answer Excessive anterior tilt of the socket If the amputated limb is quite short, it may be necessary in dynamic alignment to reduce the Medial-proximal and lateral-distal forces on the stump by: - Answer Moving foot laterally The Scarpa's triangle area extends laterally about 2/3 of the distance across the proximal-anterior socket. T/F - Answer False With a BK at mid-stance where are the pressures (forces) in the socket in the sagittal plane: - Answer Proximal/Anterior and Distal/Posterior For a Very Short BK, why is a PTS advantageous? - Answer added M/L stability When static aligning a BK, if the pylon leans laterally, the cause may be: - Answer Too much adduction in the socket what is a characteristic of the constant friction knee? - Answer Permits the knee to sing at varying speeds depending on cadence During normal human locomotion, how many inches does the center of gravity shift form side to side? - Answer 2 inches The center of gravity of the adult male is located on the midline of the body at the level of the: - Answer Second sacral vertebra The surgical attachment of muscle to muscle is known as: - Answer Myoplasty During normal human locomotion, between heel contact and foot flat, the floor reaction force tends to cause which moments at the hip and knee? - Answer Hip: Flexion Knee: Flexion If the sciatic nerve is severed at the level of the lesser trochanter, muscle function will NOT be impaired at the: - Answer Hip Joint