Which degenerative condition is NOT known to affect BMD results?

Osteoporosis is primarily characterized by a decrease in bone density and the deterioration of bone tissue, which directly impacts bone mineral density (BMD) results. Therefore, it is directly associated with BMD outcomes rather than being a condition that does not affect them.

In contrast, some conditions like scoliosis, polio, and avascular necrosis can influence the mechanics and distribution of bone loading, leading to variations in BMD. Scoliosis can lead to uneven pressure and strain on the bones, which may affect overall bone health. Polio leads to muscle weakness and can result in altered biomechanics, potentially impacting bone density. Avascular necrosis affects bone due to a lack of blood supply, ultimately leading to bone damage and changes in density over time.

Thus, osteoporosis is the condition that is recognized as affecting BMD results, making it distinct from the others listed in this context.