Which of the following is NOT a common use of diathermy?

Diathermy is primarily utilized in the medical field for therapeutic purposes, particularly by using high-frequency electromagnetic currents to produce heat within the body tissues. This heat can help alleviate pain, reduce inflammation, and improve blood circulation, making options A, B, and D common uses for diathermy.

Treating muscle spasms involves relieving the muscle tension and discomfort through the application of heat generated by diathermy, thereby enhancing relaxation and pain relief. Reducing inflammation benefits from the heat's ability to increase blood flow and promote healing processes, while improving blood circulation directly relates to the increased metabolic activity stimulated by the heating effects of diathermy.

In contrast, healing bone fractures is not a typical application of diathermy. While diathermy can enhance blood flow to tissues, which might support the healing environment, it does not directly promote the healing of fractures in bone. Bone healing predominantly relies on immobilization and biological processes rather than heat application from diathermy. Thus, it is not considered a common use of this modality.