What action should the nurse take after supporting the client's knee with one hand during passive ROM exercises?

After supporting the client's knee with one hand during passive range of motion (ROM) exercises, cradling the client's heel is the most appropriate action. This technique provides stability and support to the joint and allows for controlled movement of the leg without causing strain or discomfort to the client. By cradling the heel, the nurse can effectively facilitate the exercise while ensuring that the knee and surrounding muscles are properly aligned and protected.

Cradling the heel also gives the nurse more control over the movement, allowing for smooth, gradual motions that respect the client’s range of movement and comfort level. This is particularly essential for passive ROM exercises, where the nurse actively moves the client's limbs while the client remains relaxed. Proper support is crucial in minimizing the risk of injury and maximizing the benefits of the exercises.

Other options may involve movements or actions that do not prioritize the support of the knee joint or could risk discomfort or harm to the client, making them less suitable choices in this context.