Many people report "lower extremity" problems from work, but chronic problems are rarely if ever reported in official statistics or recorded on the OSHA 300. BrooklynDodger was surfing medline, and found this early data mining effort from the Framingham study.
In this study, knee osteroarthritis (OA) was assessed by weight bearing knee radiograph at when mean age of subjects was 73 years. Each subject's job was characterized by its level of physical demand and whether the job was associated with knee bending. Men whose jobs required knee bending and at least medium physical demands had higher rates of later radiographic knee OA (at least definite osteophytes) than men whose jobs required neither (43.4 vs 26.8%; OR of OA = 2.22) Rates of severe radiographic OA (osteophytes and joint space narrowing) and of bilateral radiographic OA were also significantly increased in these men.
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Occupational physical demands, knee bending, and knee osteoarthritis results from the Framingham Study
Felson, D. T.; Hannan, M. T.; Naimark, A.; Berkeley, J.; Gordon, G.; Wilson, P. W., and Anderson, J. .
J Rheumatol. 1991 Oct; 18(10)1587-92.
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