What is a common fallacy about using crutches with systemic diseases?

The assertion that systemic diseases only affect one limb is a common fallacy because systemic diseases, by their very nature, affect the entire body rather than being localized to just one area. Systemic conditions, such as autoimmune diseases, infections, or metabolic disorders, can lead to widespread effects including weakness, fatigue, pain, and other systemic symptoms.

This misconception can lead to inappropriate patient education and management, as assuming the disease is limited to one limb may result in inadequate support or interventions for the overall physical condition of the patient. Crutches are intended to assist individuals with mobility by alleviating pressure on affected limbs; however, they do not address the broader impacts of systemic illnesses. Thus, their use is not solely confined to conditions affecting just one limb, making this statement misleading.