Which of the following is an example of mechanotherapy?

Mechanotherapy refers to the therapeutic use of mechanical forces to stimulate biological processes, particularly in the healing and strengthening of tissues. Among the choices, ultrasound is a modality that utilizes sound waves to produce mechanical vibrations, promoting tissue repair and regeneration. This technique is effective in managing pain and healing soft tissue injuries by enhancing blood flow and encouraging cellular repair mechanisms.

Ultrasound operates through a mechanism that involves the absorption of sound waves by tissues, which may lead to thermal effects, as well as non-thermal effects such as cavitation and acoustic streaming. These mechanical interactions can stimulate cellular activities crucial for healing.

In contrast, while orthotics and bracing may assist in stabilizing and supporting injuries, they do not primarily work through the application of mechanical energy to elicit biological changes in tissue. Rest, while essential for recovery, does not provide active mechanical intervention. Hence, ultrasound stands out as the clear example of mechanotherapy among the options provided.