Navicular stress (Dr. Yoho)

Question 1

What causes navicular stress injuries?

Answer 1

• difference between sprinters and long distance runners
• causes different stress to bones
• sudden increase in exercise will cause bone stress as well

Question 2

What are the clinical findings to look for?

Answer 2

positive N sign (pain felt on navicular bone when force is applied?)

Question 3

What diagnostic tests are most helpful?

Answer 3

CT, MRI, bone scan

Question 4

What are two things a patient will do to compensate for mild equinus?

Answer 4

1) pronate subtalar joint

2) hyperextend knee

Question 5

What are some predisposing factors to navicular stress?

Answer 5

• cavus foot (high arch)
• metatarsus adductus
• short first metatarsal
• ankle equinus
• shape of navicular

Question 6

How can you tell the difference between MRI and CT graph?

Answer 6

MRI: bone shows up black
CT: bone shows up white