C. A. Krach, A. Victoria and U. S. Velkoff, “Bureau of the Census, Current Population Reports, Series P23-199RV Centenarians in the United States,” US Government Printing Office, Washington, 1999.
 S. R. Cummings, S. M. Rubin and D. Black, “The Future of Hip Fractures in the United States. Numbers, Costs, and Potential Effects of Postmenopausal Estrogen,” Clinical Orthopaedics and Related Research, Vol. 252, 1990, pp. 163-166.
 S. E. Hall, J. A. Williams, J. A. Senior, P. R. Goldswain and R. A. Criddle, “Hip Fracture Outcomes: Quality of Life and Functional Status in Older Adults Living in the Community,” Australian and New Zealand Journal of Medicine, Vol. 30, No. 3, 2000, pp. 327-332. doi:10.1111/j.1445-5994.2000.tb00833.x
 J. A. Grisso, J. L. Kelsey, B. L. Strom, et al., “Risk Factors for Falls as a Cause of Hip Fracture in Women. The Northeast Hip Fracture Study Group,” The New England Journal of Medicine, Vol. 324, No. 19, 1991, pp. 1326-1331. doi:10.1056/NEJM199105093241905
 J. M. Hausdorff, D. A. Rios and H. K. Edelberg, “Gait Variability and Fall Risk in Community-Living Older Adults: A 1-Year Prospective Study,” Archives of Physical Medicine and Rehabilitation, Vol. 82, No. 8, 2001, pp. 1050-1056. doi:10.1053/apmr.2001.24893
 M. C. Hornbrook, V. J. Stevens, D. J. Wingfield, J. F. Hollis, M. R. Greenlick and M. G. Ory, “Preventing Falls among Community-Dwelling Older Persons: Results from a Randomized Trial,” Gerontologist, Vol. 34, No. 1, 1994, pp. 16-23. doi:10.1093/geront/34.1.16
 R. Verma, A. S. Rigby, C. J. Shaw and A. Mohsen, “Acute Care of Hip Fractures in Centenarians—Do We Need More Resources?” Injury, Vol. 40, No. 4, 2009, pp. 368-370. doi:10.1016/j.injury.2008.09.008
 G. Holt, D. Macdonald, M. Fraser and A. T. Reece, “Outcome after Surgery for Fracture of the Hip in Patients Aged over 95 Years,” Journal of Bone & Joint Surgery, Vol. 88, No. 8, 2006, pp. 1060-1064. doi:10.1302/0301-620X.88B8.17398
 C. Ossendorf, M. J. Scheyerer, G. A. Wanner, H. P. Simmen and C. M. Werner, “Treatment of Femoral Neck Fractures in Elderly Patients over 60 Years of Age—which Is the Ideal Modality of Primary Joint Replacement?” Patient Safety in Surgery, Vol. 4, No. 1, 2010, p. 16. doi:10.1186/1754-9493-4-16
 R. Hornby, J. G. Evans and V. Vardon, “Operative or Conservative Treatment for Trochanteric Fractures of the Femur. A Randomised Epidemiological Trial in Elderly Patients,” Journal of Bone & Joint Surgery, British Volume, Vol. 71, No. 4, 1989, pp. 619-623.
 E. Krishnan, J. F. Fries and C. K. Kwoh, “Primary Knee and Hip Arthroplasty among Nonagenarians and Centenarians in the United States,” Arthritis & Rheumatism, Vol. 57, No. 6, 2007, pp. 1038-1042. doi:10.1002/art.22888
 M. P. van de Kerkhove, P. S. Antheunis, J. S. Luitse and J. C. Goslings, “Hip Fractures in Nonagenarians: Perioperative Mortality and Survival,” Injury, Vol. 39, No. 2, 2008, pp. 244-248. doi:10.1016/j.injury.2007.07.009
 J. E. Kenzora, R. E. McCarthy, J. D. Lowell and C. B. Sledge, “Hip Fracture Mortality. Relation to Age, Treatment, Preoperative Illness, Time of Surgery, and Complications,” Clinical Orthopaedics and Related Research, Vol. 186, 1984, pp. 45-56.
 P. Haentjens, P. Autier, M. Barette and S. Boonen, “The Economic Cost of Hip Fractures among Elderly Women. A One-Year, Prospective, Observational Cohort Study with Matched-Pair Analysis. Belgian Hip Fracture Study Group,” The Journal of Bone & Joint Surgery, Vol. 83, No. 4, 2001, pp. 493-500.
 C. L. Leibson, A. N. Tosteson, S. E. Gabriel, J. E. Ransom and L. J. Melton, “Mortality, Disability, and Nursing Home Use for Persons with and without Hip Fracture: A Population-Based Study,” Journal of the American Geriatrics Society, Vol. 50, No. 10, 2002, pp. 1644-1650. doi:10.1046/j.1532-5415.2002.50455.x
 L. J. Melton III, S. E. Gabriel, C. S. Crowson, A. N. Tosteson, O. Johnell and J. A. Kanis, “Cost-Equivalence of Different Osteoporotic Fractures,” Osteoporosis International, Vol. 14, No. 5, 2003, pp. 383-388. doi:10.1007/s00198-003-1385-4
 P. Haentjens, G. Lamraski and S. Boonen, “Costs and Consequences of Hip Fracture Occurrence in Old Age: An Economic Perspective,” Disability and Rehabilitation, Vol. 27, No. 18-19, 2005, pp. 1129-1141. doi:10.1080/09638280500055529