Final answer:
The partner should remind the patient to use a walker when moving around in the house.
Step-by-step explanation:
The correct statement that indicates an understanding of postoperative care for a client who had a total hip arthroplasty is D) "I will remind my partner to use a walker when moving around in the house." After a total hip arthroplasty, it is important for the patient to use a walker or crutches for support and to avoid putting too much weight on the operated leg. This helps protect the new hip joint and promotes healing. Using a wheelchair (option B) is not recommended for mobility after hip arthroplasty, as it hinders the patient's ability to bear weight and maintain strength. Lifting heavy objects (option A) and performing high-impact exercises (option C) are both contraindicated as they can put excessive stress on the hip joint and increase the risk of complications.