image based Q. 68 - Cast split

Q.  How much pressure should we expect to drop if plaster of Paris cast is cut in below case?

a. 20%
b. 50%
c. 10%
d. 30%
e. 60%

Answer -
d

 The picture depicts unilateral cutting of cast (i.e. univalving).

Cast splitting relieves pressure in the setting of suspected compartment syndrome in the given degrees.

Univalving - 30% pressure drop and bivalving leads to 60% pressure drop.