TMD 4 - Radiology of TMJ

Question 1

What would an ultrasound of the TMJ show you that another image could not provide?

Answer 1

Shows the range of condylar movements

Whereas other images are static

Question 2

What is the effective dose of MDCT (multi detector CT)?

Answer 2

200uSv

Question 3

What is the effective dose of CBCT?

Answer 3

21-80uSv

Question 4

What is arthrocentesis and when is it used?

Answer 4

Invasive technique using saline or ringers solution +/- anti-inflammatory drugs in upper TMJ compartment
Used if calcific bodies are in joint space or joint is sticky due to inflammatory mediators in synovial fluid

Question 5

What is synovial chondromatosis?

Answer 5

Rare benign condition with formation of multiple small foci of hyaline cartilage/ hyper plastic synovial in joints
Enlarge if no surgery

Question 6

What is the process of nuclear medicine - radionuclide imaging?

Answer 6

Gamma camera recording hot spots
Using isotope
IV injection - labelled