Osteopenia refers to demineralized or under mineralized bones. Periarticular osteopenia is a lowering of density in the area of bones which surround a joint. Periarticular osteopenia is most common in the hands, but can occur around any joint.

Yes you can ski with osteopenia, but your chances of fracture or higher than someone without it.

Diffuse osteopenia is mild decrease in bone mineralization - not as severe as osteoporosis

Osteopenia is of concern because it can lead to premature osteoporosis.

osteopenia refers to decreased calcification or density of bone. having osteopenia places a person at risk for developing osteoporosis, a more serious condition that causes bones to become brittle or possibly break.
Bone deficiency