BK Px Exam

Question 1

Pt complains of difficulty rolling over the ball of the foot, most likely cause

Answer 1

Excessive PF of the foot

Question 2

Which portion of stance phase is the Px side in knee extension likely to occur

Answer 2

Initial contact

Question 3

Rehabilitation of the BK amputee should ideally be initialed

Answer 3

Preoperatively

Question 4

When wrapping a BK limb for shrinkage, it is important that

Answer 4

Most of the pressure is in the distal end of the limb

Question 5

Purposes for wearing Px socks (3)

Answer 5

-Reducing friction between stump and skin
-Allow padding between stump and skin
-Wick sweat away from skin

Question 6

PTB cuff suspension strap derives its suspension over which area

Answer 6

Proximal patella

Question 7

Redundant tissue is described as

Answer 7

Excessive soft tissue

Question 8

The A-P measurement of a BK amputee is taken in flexion at

Answer 8

15 deg

Question 9

A-P measurement of the BK amputee is taken between the

Answer 9

Patella-tibial tubercle and the medial/lateral hamstrings tendons

Question 10

M-L dimension of the plaster model when using a soft liner should be

Answer 10

Same as measurement

Question 11

Preferred Px foot and ankle unit for the BK PTB Px

Answer 11

SACH

Question 12

In PTB socket, anterior brim of the socket should extend to the

Answer 12

Point midway between upper and lower borders of the patella

Question 13

In evaluation of a unilateral LE amputee’s ability to utilize a Px successfully, an important consideration is their

Answer 13

Balance and coordination on crutches

Question 14

Pt complains of prolonged anterior distal tibia discomfort

Answer 14

Foot too posterior

Question 15

In order to obtain optimum M-L stability of he PTB during gait, observe that socket diplaces _____ not more than _____” during midstance phase of gait

Answer 15

Laterally, 1/2”

Question 16

As the amputee rolls over the foot in stance phase, his knee joint should

Answer 16

Extend slightly

Question 17

In dynamic alignment, lateral gapping at the socket brim is reduced by

Answer 17

Tilting the socket medially

Question 18

In dynamic alignment, if the knee if forced forward and knee flexion is exaggerated at heel contact, it indicates

Answer 18

Socket positioned too far anteriorly

Question 19

In evaluating the PTB Px during gait, the foot must be flat on the floor at mid-stance, of which the indication is

Answer 19

Pylon vertical

Question 20

If the amputated limb is short, it may be necessary in dynamic alignment to reduce the medial-proximal and lateral-distal forces on the stump by

Answer 20

Moving foot lateral

Question 21

As the outset of the foot is increased in aligning a BK Px, pressures are increased on the following areas of the stump

Answer 21

Medial-distal and lateral-proximal

Question 22

When the BK amputee controls the tendency of the knee to flex after heel strike, the pressures are increased on the following aspects of the stump

Answer 22

Anterior-distal and posterior-proximal

Question 23

Hyperextension of the knee can be decreased by moving the socket ______ in relation to the foot

Answer 23

Anterior

Question 24

2 main functions of the BK cuff suspension strap

Answer 24

Maintains the knee in flexion and suspends Px

Question 25

When the foot of a BK is inset, the forces are distributed

Answer 25

Proximal/medial and distal/lateral

Question 26

With a BK at mid-stance, where are the pressures (forces) in the socket in the sagittal plane

Answer 26

Straight down to the floor

Question 27

Main areas (2) of weight bearing in a BK

Answer 27

Patella tendon and medial tibial flare

Question 28

For a very short BK, why is a PTS advantageous

Answer 28

Added M-L stability

Question 29

When bench aligning a BK, the M-L foot placement is

Answer 29

Inset 1/2"

Question 30

When static aligning a BK, if the pylon leans laterally, the cause may be

Answer 30

Too much abduction in the socket

Question 31

What is the effect of moving the socket more forward over the foot

Answer 31

Reduces length of anterior lever arm of foot

Question 32

The modification at the medial flare of the tibia is primarily made

Answer 32

To aid in vertical loading in the socket

Question 33

What is the effect on gait of lengthening the posterior lever arm of the foot

Answer 33

Tends to flex the knee at heel strike

Question 34

Function of a Px foot must simulate motion of a normal foot. If PF or heel compression does not occur

Answer 34

Knee stability of the amputee will be affected

Question 35

When the Px foot is placed in excessive DF

Answer 35

The knee is made unstable

Question 36

Pts who are converted from side joints and thigh lacer to corsetless PTB commonly exhibit what problem

Answer 36

Knee extension throughout stance phase

Question 37

A-P instability of the knee is caused by a tear of the

Answer 37

Cruciate ligaments

Question 38

The final factor that determines your selection of heel cushion durometer in a SACH foot is the

Answer 38

Compression of heel cushion at heel strike

Question 39

During normal human gait, the primary function of the gluteus medius is

Answer 39

Maintain lateral stability of the pelvis

Question 40

Compared to a PTB with cuff suspension, the PTB SC/SP socket offers what advantages (4)

Answer 40

-Enhanced M-L stability -More positive knee extension stop -Less pistoning during swing phase -A self-suspending Px

Question 41

In a PTB Px, the BK RL should have the greatest vertical loading force during stance phase concentrated at the

Answer 41

Medial flare of the tibia

Question 42

When the counter of the shoe fits too tightly on a SACH foot, which problem can result

Answer 42

Less compression of the heel

Question 43

1 week after receiving a new Px, a BK Pt complains of hyperextension of the knee a mid-stance. The most likely cause

Answer 43

Pt has changed to a shoe with a lower heel

Question 44

Landmarks that can be used to determine the correct length of a Px

Answer 44

-Medial tibial plateau -Posterior superior iliac spine -Anterior superior iliac spine -Iliac crest

Question 45

The anterior stop in a single axis foot substitutes for which muscle

Answer 45

Gastrocnemius

Question 46

When a rigid plaster dressing is applied following a BK amputation, the relief pads should be placed

Answer 46

To bridge the tibial crest

Question 47

With a PTB Px, excessive knee flexion occurs after heel strike. Which foot and socket adjustments best corrects the problem

Answer 47

Move foot anterior and decrease socket flexion

Question 48

On reason for aligning the PTB Px so that the Pt's knee is partially flexed is to

Answer 48

Give the amputee better balance while standing

Question 49

In BK bench alignment, correct M-L placement of the foot with reference to the midline of the socket it

Answer 49

Inset up to 1/2" (12mm)

Question 50

Improperly located PTB studs can cause (3)

Answer 50

-Swing phase whips -Inadequate suspension -Difficulty in sitting

Question 51

The PF bumper substitutes in part for which of the following muscles

Answer 51

Tibialis anterior

Question 52

Advantages (3) of a multi-axial Px foot

Answer 52

-Absorbs torque -Accommodates uneven ground -Minimizes shear forces on the skin

Question 53

When the BK Pt controls the tendency of the knee to flex after heel strike, the pressure are increased on which areas of the limb

Answer 53

Distal/anterior and proximal/posterior

Question 54

Compared to a PTB SC, the joints and corset PTB offers with advantages (3)

Answer 54

-Enhanced M-L stability -MOre positive knee extension stop -Greater WB distribution

Question 55

During dynamic alignment of a PTB, excessive knee flexion occurs at the beginning of heel right. How to correct it

Answer 55

Move foot anterior and decrease socket flexion

Question 56

A long posterior flap in a BK amputation secondary to ischemia is preferred because of

Answer 56

Better blood supply

Question 57

A tendon that is readily visible or palpable in the popliteal area when the knee is flexed is that of the

Answer 57

Biceps femoris

Question 58

During static alignment of a PTB Px, the prosthetist noted that the Pt's knee was going into hyperextension while standing, even though bench alignment had been correct. The prosthetist should

Answer 58

Check the compression of the SACH heel