Midtarsal Joint

Question 1

Type of Joint

Answer 1

Mixture of:
Talocalcaneonavicular- synovial ball and socket between Ball= head of talus
Sockets= post surface of navicular and deep surface of plantar calcaneonavicular (spring) ligament

And

Calcaneocuboid- synovial plane between ant.surf of calcaneus (concave) and post surface of cuboid (convex)

• Fibrous capsule, lined by synovial membrane surrounds joint
• Thickened above and below by dorsal and plantar calcaneocuboid ligts respectively

Question 2

Supporting ligaments

Answer 2

Plantar calcaneocuboid (short plantar) - strong short broad band

• from rounded eminence on anteroinferior surface of calcaneus to plantar surface of cuboid behind ridge of peroneal groove
• reinforces joint capsule

Dorsal calcaneocuboid - thin broad band
-strengthens dorsal aspect of capsule

Bifurcate (2 parts) - strong connections between 1st,2nd row of tarsals
From upper calcaneal surface ant to sinus tarsi to:
-calcaneonavicular part runs slightly sup to lat surface of navicular
-calcaneocuboid part runs horizontally to dorsimedial angle of cuboid

Long plantar - attached posteriorly (bottom of foot)
From between ant and post calcaneal tubercles to:
-deep fibres on cuboid ridge
-intermediate to cuboid tuberosity
-superficial to lat four MT bases

Dorsal, plantar, interosseous cuboidnavicular ligts - also pass between cuboid and navicular

Question 3

Movements available

Answer 3

Supination
Pronation

Combined with subtalar = inversion and eversion

• inversion at ST + supination at midT
• eversion at ST + pronation at midT