image based Q. 81 - Triangulation

Q.  'Triangular osteosynthesis' is used in which of these?


a. Ankle fracture
b. Sacrum fractures
c. pelvic fracture
d. Deformity correction
e. Complex carpal injuries

Answer -
b

fractures of sacrum often require spinopelvic fixation and that is also referred to as Triangular fixation as fixation of spine and bilateral pelvic region resembles triangular shape.

image based Q. 80 - wrist twist

Q.  Which of these sign is denoted by arrow in below radiograph of wrist injury also showing additional fracture of distal radius?



a. Terry Thomas sign
b. Empty sac sign
c.  Spilled tea cup sign
d. Piano key sign

Answer -
a
The abnormal  gap between scaphoid (S) and lunate ( L) denotes scapholunate ligament injury and this is called Terry Thomas sign after the famous television comedian who had gap between his two front teeth.

Spilled tea cup sign is found in lunate dislocation.

Piano key sign is suggestive of abnormal mobility between distal radius and ulna
In cases with distal radio-ulnar joint (DRUJ) instability.