Tarsometasarsal Joints

Question 1

Type of joint

Answer 1

Overlapping synovial plane jts

• base of MT1 and medial cuneiform
• base of MT2 forms mortise with all three cuneiforms and articulates with all three
• base of MT3 and lateral cuneiform
• base of MT4 with cuboid and small part of lat cuneiform
• base of MT5 with cuboid

Capsule formed by thickenings of interosseous, plantar and dorsal TMT ligts
Synovial membrane attaches to art margins and lines and all non-art surfaces

Question 2

Supporting Ligaments

Dorsal=top of foot
Plantar=bottom of foot

Answer 2

Dorsal TMT - weak short slips between adjacent dorsal surfaces of tarsal bones and MTs
-between MTs and cuneiform/cuboid and adjacent MTs

Plantar TMT - similar slips connecting plantar surfaces

Interosseous TMT

• first ligt between anterolateral surface of med cuneiform and base of MT2
• second between anterolateral angle of lat cuneiform and base of MT4
• occasionally third runs between lat side of MT2 and lat cuneiform