Efficacy of Waterproof Cast Protectors and Their Ability to Keep Casts Dry


      The purpose of the study was to compare the efficacy of 6 different commercially available waterproof cast protectors in their ability to maintain a dry environment and evaluate whether cast protectors perform better than a plastic bag secured with tape in keeping casts dry.


      We enrolled 23 adult participants to test 6 different commercially available cast protectors and a plastic bag. Participants trialed all cast protectors twice, with and without motion, by fully submerging each cast protector in water with a paper towel held between their index and middle fingers. Moisture accumulation within the cast protectors was estimated by the change in weight of paper towel. An analysis of variance test was performed to compare differences between cast protectors in their ability to maintain a dry internal environment.


      The plastic bag showed an average moisture accumulation of 5.50 g without motion compared with all other cast protectors, which had 0.0 g of moisture accumulation. One cast protector and the plastic bag had an average moisture accumulation of 0.46 g and 4.51 g with motion compared to all other cast protectors. The plastic bag was ranked the worst by 100% of participants.


      Cast protectors appear to offer superior protection from moisture compared with a plastic bag.

      Type of study/level of evidence

      Therapeutic IV.

      Key words

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