Kienbock Disease Explained

Kienbock disease is a condition that affects the bones in the wrist. Specifically, it involves the Lunate bone, which is one of the small carpal bones located in the middle of the wrist.

Understanding Kienbock Disease

The core issue in Kienbock disease is the avascular necrosis of the lunate bone. This means that the blood supply to the lunate bone is disrupted or stops completely. Without proper blood flow, the bone tissue begins to die, leading to the bone weakening, flattening, and eventually collapsing.

Affected Bone Identification

Let's look at the options provided:

• Lunate: This is the carpal bone affected in Kienbock disease due to the interruption of its blood supply.
• Scaphoid: While the scaphoid bone can also suffer from avascular necrosis (e.g., Scaphoid pseudoarthrosis), it is not the primary bone affected in Kienbock disease.
• Trapezoid: This is another carpal bone, located in the distal row of the wrist, and is not typically associated with Kienbock disease.
• Trapezium: Similar to the trapezoid, the trapezium is part of the distal carpal row and is not the bone affected in Kienbock disease.

Conclusion

Based on the medical understanding of Kienbock disease, the Lunate bone is the structure that is affected. This condition leads to progressive damage and dysfunction of the wrist joint.