Foot and Ankle Joints/Ligaments: Part 2 Flashcards
Calcaneus structures
- Articular facet for cuboid
- Anterior process of calcaneus
Articular facet for cuboid
- Articulates with cuboid
- Saddle shaped
- Concave superior to inferior
- Convex medial to lateral
Anterior process of calcaneus
- Junction of anterior, superior and lateral surfaces
- Projects over cuboid
- Visible on lateral radiograph
Calcaneal pitch
- Superior angulation of calcaneus
- Long axis directed superiorly and laterally
- ~ 30 - 35⁰ between long axis of talus and calcaneus
Calcaneocuboid joint
- Between calcaneus and cuboid
- Part of midtarsal joint
Beak of cuboid articulates with
- Coronoid fossa of calcaneus
- Helps stabilize joint during inversion
Calcaneocuboid joint functional classification
- Saddle (sellar) joint
- Diarthrosis
Calcaneoucuboid joint capsule attaches to
- Articular margins
Blood supply to calcaneocuboid joint
- Dorsalis pedis
- Lateral plantar
- Perforating fibular
- Lateral tarsal
Ligaments stabilizing calcaneocuboid joint
- Dorsal (dorsolateral) calcaneocuboid
- Bifurcate
- Long plantar (superficial calcaneocuboid)
- Short plantar (deep calcaneocuboid)
Dorsal (dorsolateral) calcaneocuboid ligament attachment
- Distal dorsal calcaneus
- Proximal dorsolateral aspect of cuboid
Calcaneocuboid bifurcate ligament is made up of
- Dorsal calcaneonavicular ligament
- Calcaneocuboid ligament (dorsomedial calcaneocuboid)
Long plantar ligament (superficial calcaneocuboid)
- Very strong, long ligament
Long plantar ligament (superficial calcaneocuboid) attachments
- Trigonum plantare of calcaneus
- Tibular ridge of cuboid and plantar aspect of the bases of metatarsals 2-5
- (Variable, mostly metatarsals 2-4)
Long plantar ligament (superficial calcaneocuboid) function
- Separate origins of quadratus plantae
- Helps maintain lateral longitudinal arch
Long plantar ligament (superficial calcaneocuboid) creates
- Fibular (peroneal) canal by its attachment to fibular ridge (cuboid ridge or crest) and met bases
- Passageway for fibularis longus tendon
Short plantar ligament (deep calcaneocuboid) attachments
- Calcaneal tubercle (anterior tubercle of calcaneus)
- Cuboid, posterior to fibular ridge including the beak (coronoid process of cuboid)
Short plantar ligament (deep calcaneocuboid) function
- Helps maintain lateral longitudinal arch
Midtarsal joint (Transverse Tarsal Joint, Chopart’s Joint)
- Functional joint
- Calcaneocuboid joint and talonavicular portion of talocalcaneonavicular
Midtarsal joint (Transverse Tarsal Joint, Chopart’s Joint) function
- Triplanar joint
- Pronation and supination
Cyma line
- Line through midtarsal joint
- Undisrupted “S”-shaped curve
3 anatomic joints form 2 that work together
- Posterior talocalcaneal
- Talocalcaneonavicular
- Calcaneocuboid
2 joints formed by the 3 anatomic joints (posterior talocalcaneal, talocalcaneonavicular, calcaneocuboid)
- Subtalar (talocalcaneal, talocalcaneonavicular)
- Midtarsal (talonavicular and calcaneocuboid)
Ligaments in the Tarsal Sinus
- Interosseous talocalcaneal ligament
- Cervical ligament
- Bifurcate ligament
- Frondiform ligament
Parts of the frondiform ligament
- Lateral root
- Intermediate root
- Medial root (3 components)
Lateral root of frondiform ligament
- Most lateral
- Originates lateral to EDB
- Also blends with inferior fibular retinaculum
Intermediate root of frondiform ligament
- Originates from sinus tarsi medial to EDB
- Posterior to cervical ligament
- Unites with lateral root to form superficial component of frondiform ligament
Medial root of forndiform ligament 3 components
- Lateral calcaneal component
- Medial calcaneal component
- Talar component
Lateral calcaneal component of medial root (frondiform ligament)
- Originates in sinus tarsi
- Posterior to intermediate root
Medial calcaneal component of medial root (frondiform ligament)
- Attaches to floor of tarsal canal