J. Kreuder et al., «[Efficacy and side effects of differential calcium and phosphate administration in prevention of osteopenia in premature infants],» Monatsschr Kinderheilkd (Germany) 138, no. 11 (Nov 1990): 775 — 9. (babyreference.com)
I'm 28, have not had a period in 6 years and was diagnosed with osteopenia in my spine a couple of years ago. (paleoforwomen.com)
In a 2012 case report, a Mayo Clinic researcher wrote about three people with osteopenia who developed yoga - induced back and neck pain or compression fractures. (health.com)