National Board of Chiropractic Examiners (NBCE) Practice Test

Keinbock disease predominantly affects which bone?

1. Lunate

2. Scaphoid

3. Capitate

4. Hamate

The correct answer is: Lunate

Kienböck disease is a condition related to the blood supply of the lunate bone in the wrist. It is characterized by avascular necrosis of the lunate, which means that the bone loses its blood supply and begins to die. This condition is particularly significant because the lunate is one of the carpal bones that plays a crucial role in wrist movement and stability. As the blood flow diminishes, the lunate can become irregular in shape, leading to pain, decreased range of motion, and potential long-term functional impairment of the wrist. Understanding the specific pathological processes of Kienböck disease highlights why the lunate is predominantly affected. Other carpal bones, such as the scaphoid, capitate, and hamate, are not the primary sites of this condition, although they may be involved in different types of wrist injuries or pathologies. The focus on the lunate is key to understanding the implications of Kienböck disease, making it essential for practitioners dealing with wrist injuries to be aware of this specific condition and its effects.