Pediatric Radiology > Musculoskeletal > The Pediatric Lower Extremity > Clubfoot


Clubfoot

Clubfoot, or talipes equinovarus, is a relatively common congenital abnormality with a frequency of roughly 1:1000. Males are affected twice as often as females. It is bilateral in about half of the cases. Clinically the foot is plantar flexed, the forefoot is medial and the sole faces inwards. Standard radiographs include AP and lateral weight-bearing films. These XR's are utilized in surgical planning.

The four main components of clubfoot are:

  1. hindfoot varus (calcaneus is too far medial)
  2. equinus heel (fixed plantar flexion of the heel)
  3. metatarsus adductus (adduction of the metatarsals with forefoot varus)
  4. talonavicular subluxation

Radiographic characteristics include:

  • hindfoot varus - decreased AP talocalcaneal angle, < 20 degrees
  • equinus heel - decreased lateral talocalcaneal angle, < 35 degrees (the talus and calcaneus are nearly parallel); increased lateral tibiocalcaneal angle, > 90 degrees
  • metatarsus adductus - medial displacement of the first metatarsal relative to the long axis of the talus
  • talonavicular subluxation - medial subluxation of the navicular with respect to the talus
Talipes Equinovarus in a 2-year-old male. A, Frontal view of the right foot shows hindfoot varus with a decreased AP talocalcaneal angle of 17 degrees. There is also forefoot varus - the line through the long axis of the talus lies lateral to the first metatarsal and actually bisects the third metatarsal shaft. B, Lateral view shows a decreased lateral talocalcaneal angle of 11 degrees - the talus and calcaneus are nearly parallel. Equinus heel is also present with the hindfoot plantarflexed in relation to the tibia.

 




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