Biomechanics- Axis and Planes Flashcards
three planes
sagittal
frontal
transverse
- vertical plane passing through the body from front to back
- divides into right half and left half
- divides body into equal symmetrical halves
sagittal plane
- vertical plane passing through the body from side to side
- divides body into front and back half
- divides body into equal, but asymmetrical halves
frontal plane
- horizontal plane passing through the body from side to side and front to back
- divides body into upper and lower halves
- divides body into equal, but asymmetrical halves
transverse plane
- always perpendicular to the plane in which the motion takes place
- used to describe specific kind of motion
axis of motion
considered the proximal part
axis of motion
takes place in the distal part
motion
the line around which motion takes place
axis
vertical axis perpendicular to the ground and lies in the frontal and sagittal planes
- frontal-sagittal axis
- axis of transverse plane of motion
- abduction and adduction motion of foot
horizontal axis which passes from side to side and lies in frontal and transverse planes
- frontal-transverse axis
- axis of sagittal plane of motion
- dorsiflexion and plantar flexion of the foot. flexion and extension of the leg
horizontal axis which passes from front to back and lies in sagittal and transverse planes
- sagittal-transverse axis
- axis of frontal plane motion
- inversion/eversion of the foot
- abduction and adduction in leg (not to be confused with transverse plane motion)
- motion of transverse plan around frontal-sagittal axis
- moves away from midline
abduction
- motion of transverse plane around a frontal-sagittal axis
- moves toward midline
adduction
- motion of sagittal plane around a transverse-frontal axis
- distal aspect of foot moves dorsally, towards tibia
dorsiflexion
- motion in sagittal plane around transverse-frontal axis
- distal aspect of foot moves plantarly, away from tibia
Plantarflexion
- motion of frontal plane around transverse-sagittal axis
- plantar surface of foot move toward midline of the body.
inversion
- motion of frontal plane around a transverse-sagittal axis
- plantar surface of foot move away from midline of body
eversion
- complex triplane motions
- component on all three body planes
- none can take place independently of the other two.
pronation and supination
motion occurring when it’s not weight-bearing
open kinetic chain
motion when force is applied
closed kinetic chain
motion of the leg- abduction and adduction
frontal plane motion
motion of the leg- flexion and extension
sagittal plane motion
motion of the leg- internal and external rotation
transverse plane motion
Fixed structural variations of the foot:
- fixation of a part in the position it would assume in adduction. A transverse fixation with the distal end displaced toward the midline.
adductus
Fixed structural variations of the foot:
- fixation of a part in the position it would assume in abduction.
- transverse fixation with the distal end displaced away from the midline.
abductus
Fixed structural variations of the foot:
- fixation of the part in the position it would assume if inverted
- frontal plane fixation in which the plantar surface is turned toward the midline.
varus
Fixed structural variations of the foot:
- fixation of the part in the position it would assume if everted.
- frontal plane fixation in which the plantar surface is turned away from the midline.
valgus
Fixed structural variations of the foot:
- fixation of the foot or part of the foot in the position it would assume if plantarflexed.
- distal end of the part is further away from the tibia.
equinus
ex. someone walking on their tip-toes
Fixed structural variations of the foot:
- fixation of the foot or part of the foot in the position it would assume if dorsiflexed.
- distal end of the part is closer to the tibia.
calcaneus
Fixed structural variations of the foot:
- hereditary defects which change the position of the entire foot.
- deformity can be either in the talus, calcaneus or both.
talipes
sagittal plane of dorsal and plantar flexion
- motion does occur in all 3 planes
Dominant motion of ankle
deviates 42 degrees from transverse and 16 degrees from sagittal plane
subtalar joint axis
equal amounts of transverse and frontal plane motion, only some sagittal plane motion due to the 42:16 degree angle
Dominant motion of subtalar joint
access of motion deviated 10 degrees from transverse plane and 60 from sagittal
flat foot
sagittal plane and triplace motion, no medial column
Dominant motion of flat foot
15 degrees from transverse plane and 9 degrees from sagittal plane
longitudinal axis of midtarsal joint
52 degrees from transverse plane and 57 degrees from sagittal plane
oblique axis of midtarsal joint
frontal motion, inversion and eversion
dominant motion for midtarsal joint
- 45 degrees from frontal and sagittal planes
- no deviation from transverse plane (no motion)
first ray axis
equal amounts of sagittal and frontal motion with no motion in the transverse plane
dominant motion of first ray axis
deformity in the transverse plane of first ray axis
bunion
first ray dorsiflexes
it inverts
first ray plantarflexes
it everts
Read this article
Donald Green, “Planal Dominance”. JAPMA, Vol 74, February, 1984.