The effects of vitamin C supplementation on incident and progressive knee osteoarthritis: a longitudinal study.

Objective: To evaluate the association between vitamin C supplementation and the incidence and progression of radiographic knee osteoarthritis (OA).

Design: Prospective cohort study.

Setting: Clearwater Osteoarthritis Study (COS): (1988 to the present) a longitudinal study.

Job-related osteoarthritis of the knee, foot, hand, and cervical spine.

Objectives: To assess the influence of occupational exposures on risk of site-specific radiographic osteoarthritis (OA) of the knee, hand, foot, and cervical spine.

Methods: Using a cross-sectional design, data collected from men and women aged 40 years and older participating in the Clearwater Osteoarthritis Study were analyzed (n = 3436). Subjects' occupational exposures were queried using the study intake form, including stair climbing, standing on a rigid surface, squatting, and jolting.

Radiographic cervical spine osteoarthritis progression rates: a longitudinal assessment.

Relative to other sites, the cervical spine has received little attention in the osteoarthritis (OA) literature. Using data from a longitudinal study, we provide age-specific progression rates of radiographic cervical spine OA, by gender. Data from cohort subjects (ages 40+) from the Clearwater Osteoarthritis Study were analyzed (N = 707).

Exercise and hand osteoarthritis symptomatology: a controlled crossover trial.

Study Design: Randomized Clinical Trial.

Introduction: Hand exercises have been recommended as treatment for hand osteoarthritis (OA) but research evidence is sparse.

Purpose Of The Study: To investigate effects of daily 16-week home-based hand exercise among persons with hand OA.