MR Bone

Question 1

color of tendon on MRI

Answer 1

black on all sequences

Question 2

magic angle phenomenon

Answer 2

increased signal due to orientation on short TE sequences (T1, PD, GRE)

not susceptible on T2

disappears with long TE; tendon otherwise normal

Question 3

MR appearance of tenosynovitis? stenosing tenosynovitis?

Answer 3

fluid circumferrentially around fluid; loculated fluid collections around tendon sheath

Question 4

Types of stenosing tenosynovitis

Answer 4

de quervain’s: wrist
ankle: flexor hallucis longus tendon at medial ankle in os trigonum syndrome
trigger finger, toe, thumb

Question 5

tendinosis

Answer 5

myxoid degeneration from aging/overuse of tendons (not inflammation/tendonitis)

Question 6

MR imaging of tendinosis

Answer 6

intermediate intra-substance tendon signal which is normal in size/enlarged

fluid signal should raise concern for partial tear, although both will appear similar

Question 7

partial vs full tear

Answer 7

partial: incomplete disruption of fibers; may be thickened/thinned/intra-substance fluid
full: discontinuity of tendon; retraction of remannts