Which of the following is permissible when using ultrasound in the area of a joint arthroplasty?

When using ultrasound in the area of a joint arthroplasty, the presence of metal implants is permissible. Ultrasound is a safe modality that can penetrate through metal implants to a certain degree, allowing it to be effective in assessing and treating surrounding soft tissues such as muscles, tendons, and ligaments.

In the context of joint arthroplasty, using ultrasound can be beneficial for evaluating the condition of the surrounding tissues and facilitating healing without causing harm to the metal implants themselves. It is important for clinicians to be mindful of the type of materials involved, as certain conditions may pose a risk when combined with ultrasound treatment, but metal implants do not inherently contraindicate its use.

Other options, such as plastic implants, infected tissue, and neoplastic lesions, may introduce complications or contraindications for ultrasound use. For instance, the presence of infection or neoplastic lesions may necessitate modified approaches to treatment, while plastic implants may not respond predictably to ultrasound. Understanding the implications of each option is crucial for ensuring safe and effective therapeutic interventions.