Patients with Parkinson’s disease have twice the risk of suffering a fracture, and more than 3 times the risk of a hip fracture.
Melton L, Leibson C, Achenbach S, Bower J, et al. Fracture Risk After the Diagnosis of Parkinson’s Disease: Influence of concomitant dementia. Movement Disorders. 2006; 21(9): 1361-7. http://www.ncbi.nlm.nih.gov/pubmed/16703587