Which of the following instructions is NOT appropriate for a post-operative total hip arthroplasty client?

The instruction to lie with pillows under the knees is not appropriate for a post-operative total hip arthroplasty client due to the increased risk of complications such as hip dislocation and improper alignment of the hip joint. After this type of surgery, it is crucial to keep the hip in a stable position, and placing pillows under the knees can create an angle that might flex the hip more than is recommended, leading to potential stress on the newly replaced hip joint.

In contrast, maintaining an angle of less than 90 degrees when sitting helps prevent hip flexion beyond the safe limit, which is crucial for avoiding dislocation. Using a walker for mobility supports safe ambulation, as it provides stability and aids in weight-bearing as tolerated. Installing a raised toilet seat facilitates easier transfers and helps maintain the hip precautions by keeping the hip in a safer range of motion during sitting and standing activities.