American Academy of Professional Coders (AAPC) 2025 – 400 Free Practice Questions to Pass the Exam

Overuse of a joint is a primary cause of tendonitis because this condition typically arises from repetitive motion or excessive strain placed on the tendons that connect muscles to bones. When a joint is subjected to repeated stress, the tendons can become irritated, inflamed, and painful, leading to the symptoms commonly associated with tendonitis. This type of injury is frequently seen in athletes or individuals whose jobs require repetitive movements, making it a well-recognized risk factor for developing this condition.

The other options, while they may contribute to musculoskeletal problems, are less directly linked to tendonitis. For instance, infection in the bone pertains to osteomyelitis, which is a different type of condition; genetic predisposition might influence overall musculoskeletal health but does not directly cause tendonitis; and vitamin D deficiency is more commonly associated with bone health than with localized tendon injuries. Thus, overuse of a joint stands out as the most relevant and direct cause of tendonitis.