A client with a compound fracture of the left ankle is being discharged with a below-the-knee cast. Which instruction should the practical nurse (PN) provide to the client prior to discharge?

When providing instructions to a client with a below-the-knee cast for a compound fracture of the left ankle, it is important to prioritize their safety and proper care of the cast. The instruction to never scratch under the cast is crucial for preventing complications and maintaining the integrity of the cast.