Ankle/ Lower leg

CR direction on AP and obliques of the ankle:

• Medial malleolus

• 1/2”  just above the lateral malleolus

• midway between malleoli

• 1/2" above ankle joint

Eval Criteria: AP Ankle

• Ankle mortise in profile

• Distal one third tibia-fibula

  lateral & medial malleoli

    talus &

  proximal half of metatarsals

• Distal one-third of tib/fib

  lateral & medial 

                malleoli, talus,

  & proximal half of metatarsals.

• Medial mortise joint is open

  lateral mortise is closed

Correct obliquity for oblique ankle

• No Rotation

• 10 degrees

• 45 degree

• 15 to 20 degrees

Eval criteria: Ankle Mortise

• Entire ankle mortise joint

• Tibiofibular joint

  &

  entire distal fibula in 

             profile

• No overlap of anterior tubercle of tibia

  &

             superolateral portion of talus with fibula

• Talofibular joint space in profile

Obliquity for ankle mortise

• Perpendicular

• 15 to 20 degrees

• 45 degrees

• 1/2” just above the lateral malleolus

Eval criteria: Stress Ankle

• Ankle joint evaluated for separation

• Ligament tear or rupture

• Entire ankle joint open

• Appearance of joint space varies on ligament damage

Eval criteria: AP Weight Bearing Ankle

• Both ankles centered on IR

• Medial mortise open

• Distal tibia and talus

  partially superimpose

  distal fibula

• Lateral mortise closed

CR direction on lateral weight bearing ankle

• midway between

  malleoli

• Perpendicular

  1/2” above the lateral malleolus

• Perpendicular to medial

  malleoli

• Perpendicular to

  lateral malleoli

Eval criteria: Lateral Weight Bearing Ankle

• Plantar surface

  perpendicular to IR

• Superimposed talar

  domes

• Ankle joint open and in

  center of IR

• Fibula on posterior

  portion of Tibia

Eval criteria: AP Lower Leg

• Intercondylar eminence

  centered in

  intercondylar

  fossa

• No rotation of ankle

  and knee joint

• Femoral & tibial

  condyles in profile

• Some overlap of fibula

  & tibia

  visible at proximal &

  distal ends