Supporting Structures

Question 1

Describe the joint capsule of talocrural joint

Answer 1

• Fibrous capsule lined with synovial membrane

- Surrounds articular margins

Question 2

Describe the medial (deltoid) collateral ligament of the talocrural joint

Answer 2

> From medial malleolus to:
Deep bands: all medial border of talus (ant + post tibiotalar)
Superficial bands: Sustentaculum tali (tibiocalcaneal)
: Navicular tuberosity (tibionavicular)
Prevents unwanted eversion + abduction

Question 3

Describe the Lateral collateral ligament complex of the talocrural joint

Answer 3

ATFL
- Anterior inferior tip of fibula apex to lateral head of talus
- usually first to break in inversion injury
PTFL
- Post inferior fibula apex to posterior body of talus
CFL
- inferior fibula apex to lateral aspect of calcaneus

> All prevent unwanted inversion and adduction

Question 4

Describe the capsule and ligaments of the subtalar joint

Answer 4

> weak articular capsule attaching to the joint margins and the floor/roof of tarsal sinus (meets talocalcaneonavicular joint capsule forming talocalcaneal ligament)
Ligaments
- Medial talocalcaneal - med post talus to sustentaculum tali
- Posterior Talocalcaneal - posterior talus to upper medial calcaneus
Lateral talocalcaneal (deep to CFL) - Posterior talus to Lateral calcaneus

Question 5

Describe the capsule and ligaments of the mid-tarsal joint

Answer 5

> Capsule: Shared with anterior articulations of talocalcaneal joint - merges with subtalar capsule in tarsal sinus to form interosseous talocalcaneal ligament
Ligaments:
Dorsal talonavicular - sup. head of talus to sup. proximal navicular
Bifurcate ligament - Sup. distal calcaneus to sup navicular and sup cuboid
Plantar Calcaneocuboid: Short plantar ligament
From calcaneal tubercle (plantar aspect) to plantar aspect of cuboid
Plantar Calcaneonavicular: Spring ligament
from sustentaculum tali to plantar aspect of navicular tuberosity
Long plantar ligament: plantar calcaneus to plantar cuboid + bases of lateral 4 metatarsals

Question 6

Intertarsal joints

Answer 6

> Enclosed within either subtalar or mid-tarsal joint capsules
Reinforced by dorsal, plantar and interosseous ligaments

Question 7

Tarsometatarsal joints (lisfranc) + intermetatarsal joints

Answer 7

> joint capsule attaches to articular margins
reinforced by plantar, dorsal and interosseous cuneometatarsal ligaments

*intermetatarsal joints are reinforced by interosseous ligaments

Question 8

Metatarsophalangeal joints

Answer 8

> joint capsule attaches to articular margins
reinforced by plantar (on base) and collateral (on sides) ligaments
deep transverse metatarsal ligaments unite the plantar ligaments between toes

Question 9

Interphalangeal joints

Answer 9

> joint capsule around articular margins

> collateral and plantar ligaments