Hurley, M.V., Rees, J. and Newham, D.J. (1998) Quadriceps Function, Proprioceptive Acuity and Functional Performance in Healthy Young, Middle-Aged and Elderly Subjects. Age and Ageing, 27, 55-62.
 Jochanan, S., Robert, H.R., Aaron, C., Eliana, E.M. and Jeremy, M.J. (2009) Physical Activity, Function, and Longevity among the Very Old. Archives of Internal Medicine, 169, 1476-1483.
 Tinetti, M.E. and Williams, C.S. (1998) The Effect of Falls and Fall Injuries on Functioning in Community-Dwelling Older Persons. The Journal of Gerontology. Series A, Biological Sciences and Medical Sciences, 53, 112-119.
 Mary, E. and Tinetti, M.D. (2003) Preventing Falls in Elderly Persons. New England Journal of Medicine, 348, 42-49.
 Corrigan, D. and Bohannon, R.W. (2001) Relationship between Knee Extension Force and Stand-Up Performance in Community-Dwelling Elderly Women. Archives of Physical Medicine and Rehabilitation, 82, 1666-1672.
 Oya, Y., Nakamura, M., Tabata, E., Morizono, R., Mori, S., Komuro, Y. and Horikawa, E. (2008) Fall Risk Assessment and Knee Extensor Muscle Activity in Elderly People. Journal of Geriatrics, 45, 308-314.
 Peat, G., McCarney, R. and Croft, P. (2001) Knee Pain and Osteoarthritis in Older Adults: A Review of Community Burden and Current Use of Primary Health Care. Annals of the Rheumatic Diseases, 60, 91-97.
 American Geriatrics Society, British Geriatrics Society and American Academy of Orthopaedic Surgeons Panel on Falls Prevention. (2001) Guideline for the Prevention of Falls in Older Persons. Journal of the American Geriatrics Society, 49, 664-672. http://dx.doi.org/10.1046/j.1532-5415.2001.49115.x
 Okanishi, T. and Tsurumi, T. (2001) Physiotherapy of Leg Joint Disorders. Mitsuwa Shoten, Tokyo.
 Tennant, A., Fear, J., Pickering, A., Hillman, M., Cutts, A. and Chamberlain, M.A. (1995) Prevalence of Knee Problems in the Population Aged 55 Years and Over: Identifying the Need for Arthroplasty. British Medical Journal, 310, 1291-1293. http://dx.doi.org/10.1136/bmj.310.6990.1291
 Al-Zahrani, K.S. and Bakheit, A.M. (2002) A Study of the Gait Characteristics of Patients with Chronic Osteoarthritis of the Knee. Disability and Rehabilitation, 24, 275-280. http://dx.doi.org/10.1080/09638280110087098
 Zoltan, B., Robert, P., Arpad, I. and Rita, M.K. (2006) The Influence of Walking Speed on Gait Parameters in Healthy People and in Patients with Osteoarthritis. Knee Surgery, Sports Traumatology, Arthroscopy, 14, 612-622.
 Mc Alindon, T.E., Snow, S., Cooper, C. and Dieppe, P.A. (1992) Patterns of Osteoarthritis of the Knee Joint in the Community: The Importance of the Patellofemoral Joint. Annals of the Rheumatic Diseases, 51, 844-849.
 Reilly, S.C., Muir, K.R. and Doherty, M. (1996) Screening for Pain in Knee Osteoarthritis: Which Question? Annals of the Rheumatic Diseases, 55, 931-933. http://dx.doi.org/10.1136/ard.55.12.931
 Urwin, M., Symmons, D., Allison, T., Brammah, T., Busby, H. and Roxby, M. (1998) Estimating the Burden of Musculoskeletal Disorders in the Community: The Comparative Prevalence of Symptoms at Different Anatomical Sites, and the Relation to Social Deprivation. Annals of the Rheumatic Diseases, 57, 649-655.
 Astephen, J.L., Deluzio, K.J., Caldwell, G.E. and Dunbar, M.J. (2008) Biomechanical Changes at the Hip, Knee, and Ankle Joints during Gait Are Associated with Knee Osteoarthritis Severity. Journal of Orthopaedic Research, 26, 332- 341. http://dx.doi.org/10.1002/jor.20496
 Zeni, J.A. and Higginson, J.S. (2009) Differences in Gait Parameters between Healthy Subjects and Persons with Moderate and Severe Knee Osteoarthritis: A Result of Altered Walking Speed? Clinical Biomechanics, 24, 372-378.
 Oida, Y. and Nakamura, N. (2008) Exercise Learning Support Manual for the Knee Joint Ache Prevention and Reduction. Sunlife Plan, Tokyo.
 Dieppe, P.A. and Lohmander, L.S. (2005) Pathogenesis and Management of Pain in Osteoarthritis. The Lancet, 365, 965-973. http://dx.doi.org/10.1016/S0140-6736(05)71086-2
 Hashimoto, H., Hanyu, T., Sledge, C.B. and Lingard, E.A. (2003) Validation of a Japanese Patient-Derived Outcome Scale for Assessing Total Knee Arthroplasty: Comparison with Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC). Journal of Orthopaedic Science, 8, 288-293. http://dx.doi.org/10.1007/s10776-002-0629-0
 Bellamy, N., Buchanan, W.W., Goldsmith, C.H., Campbell, J. and Stitt, L.W. (1988) Validation Study of WOMAC: A Health Status Instrument for Measuring Clinically Important Patient Relevant Outcomes to Antirheumatic Drug Therapy in Patients with Osteoarthritis of the Hip or Knee. Journal of Rheumatology, 15, 1833-1840.
 Demura, S., Sato, S., Yokoya, T. and Sato, T. (2010) Examination of Useful Items for the Assessment of Fall Risk in the Community-Dwelling Elderly Japanese Population. Environmental Health and Preventive Medicine, 15, 169-179.
 Sugiura, H. and Demura, S. (2012) The Effects of Knee Joint Pain and Disorders on Knee Extension Strength and Walking Ability in the Female Elderly. Advances in Physical Education, 2, 139-143.
 Vignon, E., Valat, J.P., Rossignol, M., Avouac, B., Rozenberg, S., Thoumie, P., Avouac, J., Nordin, M. and Hilliquin, P. (2006) Osteoarthritis of the Knee and Hip and Activity: A Systematic International Review and Synthesis (OASIS). Joint Bone Spine, 73, 442-455. http://dx.doi.org/10.1016/j.jbspin.2006.03.001
 Demura, S., Sato, S., Shin, S. and Uchiyama, M. (2011) Setting the Criterion for Fall Risk Screening for Healthy Community-Dwelling Elderly. Archives of Gerontology and Geriatrics, 54, 370-373.
 Sato, S., Demura, S., Shin, S., Sugiura, H. and Uchida, Y. (2012) Assessing a Personal and Population Fall Risk Profile in Japanese Community-Dwelling Elderly. Japan Journal of Test and Evaluation in Health and Physical Education, 11, 49-55.
 Sugiura H. and Demura, S. (2013) Effects of Mild and Severe Knee Joint Pain on Various Activities of Daily Living in the Female Elderly. Pain Research and Treatment, 2013, Article ID 989508. http://dx.doi.org/10.1155/2013/989508