Final answer:
The correct position for a patient after a left posterolateral THA is to be supine with limbs parallel to the body to prevent stress on the new joint and potential dislocation.
Step-by-step explanation:
The appropriate position for a patient after a left posterolateral total hip arthroplasty (THA) is paramount to prevent dislocation and promote proper healing. The correct positioning involves avoiding positions that could place stress on the new hip joint. Given the lateral rotators' role in twisting the thigh outward and stabilizing the hip joint, and the necessity to assist with raising the knee at the hip and maintaining posture, the best position for this patient would be (c) the person is supine with upper limbs, including palms, touching sides and lower limbs touching at sides. This prevents excessive rotation or bending of the hip that can jeopardize the newly placed hip prosthesis. Options a and b describe positions that could strain the hip and are not recommended post-surgery because they may cause dislocation of the newly implanted hip prosthesis.