Unit 1 (Lower Extremeties)
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Unit 1 (Lower Extremeties)
Unit 1. Do not rely solely upon these cards. last revised spring2012.
What are the 4 parts that make up the entire lower limb?
How many bones are in the foot, and how are they divided (by groups of bones)?
: 26 bones
: 14 bones
: 5 bones
: 7 bones
Name the bones of the forefoot:
Name the bones of the midfoot:
1st, 2nd, and 3rd cuneiforms
Name the bones of the hindfoot:
Describe the location and main function of the longitudinal arch of the foot?
extends from calcaneous to the head of the metatarsals
functions as a shock absorber and allows smooth walking
Describe the location of the transverse arch of the foot and what bones does it consist of?
located primarily along the plantar surface of the distal tarsals and the tarsometatarsal joints
1st, 2nd, and 3rd cuneiforms and the cuboid
Which part of the foot is referred to as the dorsal surface or the dorsum?
the top of the foot
Which part of the foot is referred to as the plantar surface?
the bottom of the foot
How are the digits of the foot numbered?
great toe is #1
index toe is #2
middle toe is #3
ring toe is #4
pinky toe is #5
How many phalanges and joints does the great toe have?
2 phalanges (proximal and distal)
1 joint (interphalangeal joint)
How many phalanges and joints do digits 2-5 of the foot have?
3 phalanges (proximal, middle, and distal)
2 joints (proximal and distal interphalangeal joints)
Which part of a metatarsal bone is closest to the point of attachment?
the base of the bone
Which part of a metatarsal bone is distal to the point of attachment?
the head of the bone
Which metatarsal bone is the shortest and thickest of the five?
the 1st metatarsal
Which metatarsal bone is the longest of the five?
the 2nd metatarsal
What is a noteworthy aspect of the 5th metatarsal bone?
It has a tuberosity on the proximal end close to the base of the bone (a common fracture site).
What actually makes up the "ball" of the foot, or the "tippy-toes"?
the five heads of the metatarsals
Name the 7 tarsal bones, primary and secondary names:
Medial cuneiform/1st cuneiform
Intermediate cuneiform/2nd cuneiform
Lateral cuneiform/3rd cuneiform
Which tarsal bone is the most superior and forms the ankle joint with the tibula/fibula?
Label the bones of the foot by their primary names:
D. medial cuneiform
E. intermediate cuneiform
F. lateral coneiform
K. distal interphalangeal joint (DIP), 2nd digit
L. proximal interphalangeal joint (PIP), 3rd digit
M. distal phalanx, 5th digit
N. middle phalanx, 5 digit
O. proximal phalanx, 5th digit
P. metatarsophalangeal joint (MTP), 5th digit
Q. tuberosity of 5th metatarsal
R. sesamoid bones
Label the bones of the foot by their primary names:
E. medial cuneiform
F. first metatarsal
G. sesamoid bone
What 4 bones does the cuboid articulate with?
4th and 5th metatarsals (anteriorly)
lateral cuneiform (medially)
What 4 bones does the navicular articulate with?
3 cuneiforms (anteriorly)
What 4 bones does the medial cuneiform articulate with?
1st and 2nd metatarsals (anteriorly)
intermediate cuneiform (laterally)
What 4 bones does the intermediate cuneiform articulate with?
second metatarsal (anteriorly)
medial and lateral cuneiforms (medially/laterally)
What 6 bones does the lateral cuneiform articulate with?
2nd, 3rd, and 4th metatarsals (anteriorly)
intermediate coneiform (medially)
What 2 bones does the calcaneuous articulate with?
What 4 bones does the talus articulate with?
tibia and fibula (superiorly)
Which cuneiform is the largest of the three and which is the smallest?
: medial cuneiform
: intermediate cuneiform
What bone is 2nd in size and weight only to the femur?
What joints does the tibia participate in?
the knee joint
the ankle joint
What joints does the fibula participate in?
only helps to stabilize the ankle joint
What is the name of the condition where the tibial tuberosity can pull away from the bone?
Name three parts of the proximal end of the fibula:
What is another name for the intercondylar eminence?
What is on the lateral side of the distal tibia?
What is on the medial side of the distal tibia?
Where is the lateral malleolus located?
on the distal end of the fibula
What makes the "shin"?
What is the angle of the tibial plateau?
a posterior slant of 5-7°
When both the lateral and medial malleolus break?
Which leg bone has an anterior tubercle?
What makes up the tibial spine?
a medial and lateral intercondylar tubercle
On the distal femur, which condyle is larger?
the medial condyle
Give two alternate names for the patellar surface of the femur:
Name an aspect of the femur designed for strength:
it is slightly convex anteriorly
What determines the angle of the femurs?
the width of the pelvis (wider pelvis = more angle of femurs)
On the posterior surface of the femur, what is the area located just superiorly to the intercondylar fossa?
the popliteal surface
What is the largest and most constant sesmoid bone in the body?
the patella (kneecap)
Describe the patella:
approx 2" in diameter
base on top, apex on bottom
posterior surface smooth and oval-shaped
anterior surface convex and rough
articulates with femur
protects knee joint, not part of it
What type of joints are the interphalangeal joints?
hinge = flexion and extension
What type of joints are the metatarsophalangeal joints?
condyloid = flexion & extention, abduction & adduction
What type of joints are the tarsometatarsal joints and the intermetatarsal joints?
What type of joint is the ankle mortise joint?
hinge type = flexion and extension
So our only two natural movements are dorsiflex and plantarflex
abduction and adduction are stress movements
What type of joint is the proximal tibiofibular joint?
What type of joint is the distal tibiofibular joint?
(only slightly movable)
What type of joint is the knee joint?
What is the purpose of the menisci of the knee joint?
serve as shock absorbers
Name the four main ligaments of the knee joint:
anterior cruciate ligament
posterior cruciate ligament
medial collateral ligament
lateral collateral ligament
Name an injury common to the knee:
ACL damage (anterior cruciate ligament)
What technique is common to the AP (axial) projection of the toes?
50-60 kVp @ 2 mAs
What degree of angulation is used for an AP projection of the toes?
What will be different on the image of the toes if no angulation is used for the AP projection?
the joint spaces will be closed (PIPs, DIPS, IPs)
the phalanges will be foreshortened
Where is the light centered for an AP or AP oblique projection of the toes?
3rd metararsophalangeal joint
To what degree do you angle the part for an oblique projection of the toes?
30° for a medial rotation
45° for a lateral rotation
What technique is generally used for the foot?
55-60 kVp @ 3.2-4 mAs
What degree of angulation is used for an AP (axial) projection of the foot?
What is seen on an AP axial projection of the foot?
joint spaces open
overlap of 1st cuneiform and navicular
overlap of 3rd cuneiform and cuboid
open articulation of calcaneus and cuboid
Where is the light centered for the AP (axial), AP oblique, and lateral projections of the foot?
the base of the 3rd metatarsal
How should the part be angled for the AP oblique projection of the foot?
What is seen on an AP oblique projection of the foot?
cuboid and tuberosity in profile
slight overlap of base of 1st and 2nd MTs (the rest open)
What is the best projection to view the sinus tarsi?
the AP Oblique of the foot
What is seen on a lateral projection of the foot?
no direct superimposition of tarsal bones
see cuboid and tuberosity peeking from underside of foot
see sesamoid bones just under head of 1st MT
see ankle joint and 2" of tib/fib
What is a term to describe where the talus articulates with the tibia?
Why are lateral weight bearing projections taken?
for demonstrating the bones of the feet to show the condition of the longitudinal arches under the weight of the body
show fallen arches
Describe the aspects of taking an axial calcaneus projection:
40° angle posteriorly, 32" SID
center to level of base of 3rd MT, light exits both malleolus
foot dorsiflexed to be perpendicular to film
approx. 70 kVp @ 5-6 mAs
What is seen in an axial calcaneous projection?
the subtalar joint should be open
the trochlear process should be in profile, laterally
the sustentaculum tali should be in profile, medial side
Where should the light be centered for the lateral projection of the calcaneous?
one inch distal to the medial malleolus
65 kVp @ 4 mAs
What is seen in a lateral calcaneous projection?
include ankle joint and 5th MT tuberosity
talar dome directly superimposed, open ankle
(fibula closes it off slightly)
What technique is usual for an AP ankle projection?
60 kVp @ 6 mAs
What is seen in an AP ankle projection?
ankle mortise closed off on lateral side (lateral malleolus)
distal tib/fib included
both malleoli in profile
What is seen in a lateral projection of an ankle?
talus and calcaneous in profile
tibiotalar joint open
open subtalar joint
What is seen in an AP medial oblique rotation of the ankle?
fibula out to side (in profile)
distal tibiofibular joint well seen
(Potts fracture well visualized here)
What is seen in an Ankle Mortise projection (15-20° rotation)?
ankle mortise is open all the way across
Why are stress views of the ankle taken?
they can demonstrate ligament tears by a widening of the affected joint space
physician inverts and everts foot wearing lead gloves
What is seen in an AP tib/fib projection?
joint space in knee and ankle
fibula posterior to tibia proximally and distally
What is seen in a lateral tib/fib projection?
joint spaces not as open
slight overlap of tibia on fibular head
When positioning for an AP knee, how should the CR be angled if the ASIS is 19-24cm to the tabletop?
When positioning for an AP knee, how should the CR be angled if the ASIS is more than 24cm from the tabletop?
When positioning for an AP knee, how should the CR be angled if the ASIS is less than 19cm from the tabletop?
Where should the CR be centered to for an AP knee?
1/2 inch below apex of patella
What is seen in an AP knee projection?
outline of the patella superimposed behind femur
femur condyles in profile
tibial spine in center
head of tibia overlaps fibula slightly
How should the CR be centered and angled for a lateral knee?
5-7° cephalic angle, 1" distal to medial epicondyle
Name two types of fractures common to the patella:
stellate fracture - star-shaped fracture
longitudinal fracture - splits patella in half
What is seen in a lateral knee projection?
femoral condyles directly superimposed
patella in profile with patellar space open
rotational errors determined by placement of medial condyle
Other than arthritis, what are two conditions that we take standing knee projections to study?
volgus (bowlegged) knee joints
varus (knock-kneed) knee joints
note, this slide not spell-checked with text book yet****
How should the central ray be angled for the oblique projections of the knee?
the same as the AP was angled, depending on the measurement of the distance from the ASIS to the tabletop.
What is seen on an AP oblique knee, lateral rotation?
tib/fib directly superimposed
patella over lateral condyle
open joint space
What is seen on an AP oblique knee, medial rotation?
no superimposition of tib/fib
patella over medial condyle of femur
open joint space
What method is used for different versions of the PA axial projections of the knee?
for the PA axial projection of the knee using the Holmblad Method, how should the pt be positioned in relation to the IR?
femur should make a 70° angle to the IR surface (in all three positions
: on stool, at wall bucky, on table)
no angle on tube (perpendicular)
for the PA axial projection of the knee using the Camp Coventry Method, how should the pt be positioned in relation to the IR and how is the tube angled?
pt prone with knee flexed 40-50° (40-50° angle to IR)
tube angled 40-50° to match angle of knee (perpendicular entry)
What method is used for the tangential projection of the knee known as the axial or sunrise/skyline projection?
for the Settegast Method (sunrise/skyline), how is the pt positioned and how is the tube angled?
prone or supine, knee bent, knee shadow in crosshairs
tube angled approx 15-20° (depends on how much pt could bend knee)
What method is used for a tangential view of the patellar-femoral joint?
What method is used to view both knees, both patellas?
Describe how to center for the AP projections of the femur (proximal and distal)
: top of light at ASIS
: bottom of light 1-2" inferior to patellar apex
: pt leg rotated 15° internally, collimate to MSP
Describe how to position and center for proximal lateral projection of femur:
top of film at ASIS, pelvis rolled back 10-15°, unaffected leg back, knee of affected leg bent 45°
Describe how to position and center for distal lateral projection of femur:
bottom of light 1-2" below medial condyle, unaffected leg forward, knee of affected leg bent 45°