Chapter 114 - Arthridities of the Foot and Ankle

Question 1

recommended position of fusion for an ankle fusion

Answer 1

neutral to slight dorsiflexion
5 degrees of hindfoot valgus
symmetric ER to contralateral foot

Question 2

most problematic position of ankle fusion

Answer 2

plantarflexion

Question 3

indications for ankle arthroplasty

Answer 3

elderly
physiologic ankle and hindfoot alignment
end stage arthritis

Question 4

contraindications for mobile bearing taa?

Answer 4

anterior talar translation
coronal plane deformity

Question 5

isolated talonavicular arthritis is most often seen in which condition?

Answer 5

rheumatoid

Question 6

hindfoot arthritis 2/2 flat foot commonly seen with what comorbid condition?

Answer 6

achilles contracture

Question 7

bracing for hindfoot arthrtis

Answer 7

UCBL orthosis
rigid or hinged AFOs

Question 8

isolated talonavicular fusion causes what percentage of hindfoot motion lost?

Answer 8

90%

Question 9

isolated subtalar fusion causes what percentage of hindfoot motion lost?

Answer 9

40%

Question 10

isolated calcaneocuboid fusion causes what percentage of hindfoot motion lost?

Answer 10

20%

Question 11

for patients with loss of talar inclination angle (often 2/2 collapsed calcaneus fracture) what is the recommended treatment

Answer 11

bone block subtalar arthrodesis to restore talar inclination -> decreases smptoms of anterior impingement

Question 12

shoe modifications for midfoot arthritis

Answer 12

rocker bottom shoes

Question 13

surgical correction of midfoot arthritis

Answer 13

fuse 1-3 TMT, leave 4/5 TMT unfused, significnat motion through these joints

Question 14

plantar flexion malunion following ankle fusion will lead to what gait abnormality?

Answer 14

knee recurvatum