BIOMECHANICAL EVALUATION TERMS Flashcards
generate longitudinal axis of bone
bones
delineate articular surface via subchondral cortical markings/landmarks
joints
formed by intersection of longitudinal axes of any 2 metatarsals
inter metatarsals (IM) angles
formed by intersection of longitudinal axes of metatarsals 1 & 2
metatarsus primus adductus angle
formed by intersection of longitudinal axes of 1st met and 1st proximal phalanx
hallux abductus angle
relationship of tibial sesamoid to 1st metatarsal longitudinal axis
tibial sesamoid position
hallux abductor interphalangeus angle
hallux interphalangeus (HIP) angle
formed by lines connecting most distal aspects of mets 1 & 2 with 2 & 5
metatarsal (break) parabola angle
difference in distal protrusion of 1st and 2nd metatarsals form their common inter metatarsal vertex, protrusion distance
metatarsal protrusion index (MDI) or (MPI)
relationship of subchondral cortices across the 1st MPJ
1st MPJ joint congruity
name this type of 1st MPJ joint congruity:
lines parallel
congruous
name this type of 1st MPJ joint congruity:
lines cross outside joint
deviated
name this type of 1st MPJ joint congruity:
lines cross inside joint
subluxed
name this type of 1st MPJ joint congruity:
non-articular
dislocated
angle created by distal 1st metatarsal articular set line
referenced to 90 degrees
measures magnitude or intraosseous deformity
ignore DASA, T/F?
proximal articular set angle (PASA)
T
what is the normal range for PASA?
0-8 degrees
angle created by longitudinal axis of 1st proximal phalanx and its proximal articular set line
referenced to 90 degrees
measures magnitude of interosseous deformity
corrected by _____?
distal articular set angle (DASA)
akin osteotomy
what is the normal range for DASA?
0-7 degrees
entire deformity is accounted for by alterations in PASA and /or DASA
structural HAV deformity
PASA + DASA =?
what is this angle?
what is the joint?
PASA and/or DASA is _____?
what do these describe?
HA
> 16 degrees
congruous
elevated
structural HAV deformity
for positional HAV deformity
what is the HA?
PASA and DASA are normal/abnormal ?
joint is/isnt congruous
PASA + DASA is less than, equal too, greater than to HA
> 16 degrees
normal
not congruous
entire deformity is accounted for alterations in joint congruity, presumed to be largely result of asymmetric soft tissue influences
positional HAV deformity
this deformity is accounted for by soft tissue and osseous influences; sum total of intraosseous deformity not enough to account for magnitude of HA elevation
combined HAV deformity
for combined HAV deformity
what is the HA?
PASA and/or DASA is elevated or depressed?
joint is or is not congruous?
PASA + DASA is less than, equal too, greater than to HA
> 16 degrees
elevated
not congruous
a number of studies demonstrated that PASA measurements are highly variable between different evaluators
the great PASA debate
formed by correlating proximal and distal aspects of 5th metatarsal bone
lateral deviation angle
formed by intersection of longitudinal axis of lesser tarsus bones and that of 2nd metatarsal
angle?
metatarsus adductus angle
14 degrees in adult, 11 is average, 8 is ideal
formed by the intersection of longitudinal axis of 2nd metatarsal and cuneiform
angle?
engel’s metadductus angle
24 degrees or above
formed by longitudinal talar axis (column tali) and transection of lesser tarsus
what tis angle?
talonavicular angle
70 degrees
+/-10 degrees
formed by intersection of longitudinal axes of talus (column tali) and calcaneus
angle?
AP talocalcaneal angle
14-21 degrees
formed by intersection of longitudinal axes of calcaneus and cuboid bones
angle?
cuboid abduction angle
0-5 degrees
formed by intersection of column tail and longitudinal axis cuboid
angle
talocuboid angle
31 degrees +/- 3 degrees
