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diarthrodial subclassifications (synovial joints (plane/gliding joint…
diarthrodial subclassifications
3 main categories
based on no of axes-traditionally
further subdivision
on the basis of
shape & configuration
of the end of the body components
synovial joints
6 classes
plane/gliding joint
flat articular surfaces
bones slide over each other
usually biaxial joints
eg:
betw carpal bones of wrist
betw tarsal bones of ankle
also between articular processes
of vertebrae
saddle joint
Both bones have an
articular surface shaped
like a sadle
1 concave
the other convex
biaxial joints
eg:
trapeziometacarpal (thumb)
sternoclavicular joint
hinge joint
1 bone with convex surface
fits into a concave depression
of another bone
uniaxial joints
(move freely in 1 plane)
eg:
elbow
knee
interphalangeal j.of fingers
interphalangeal j.of toes
pivot joint
a bone spins on its
longitudinal axis
uniaxial joints
eg:
atlantoaxial joint (C1 & C2)
radioulnar joint @ the elbow
ball & socket joint
smooth hemisphical head
fits within a cup like socket
multiaxial joints
(the only multiaxial joints
in body)
eg:
shoulder
hip
ellipsoid/condylar joint
oval convex surface
of 1 bone fits into
a complementary-shaped
depression on the other
biaxial joints
eg:
radiocarpal joint
metacarpophalangeal joints