THE RELATIONSHIP OF RUNNING TO OSTEOARTHRITIS OF THE KNEE AND HIP ANDBONE-MINERAL DENSITY OF THE LUMBAR SPINE - A 9 YEAR LONGITUDINAL-STUDY

Objective. To determine the associations between running and radiograp hic hip osteoarthritis (OA), the progression of radiographic knee OA, and changes in bone mineral density (BMD) after 9 year followup in 28 members of a running club now aged 60-77 years and 27 nonrunner contro ls, Methods. Running subjects and nonrunning controls were matched for age (+/- 2 years), years of education, and occupation. All subjects u nderwent rheumatologic examination, completed annual questionnaires. a nd had radiographs taken of the knees in 1984, 1986, 1989, and 1993 an d of the hips in 1993, BMD of the first lumbar spine vertebrae was obt ained in 36 subjects by quantitative computed tomography (QCT) in 1984 , 1986, 1989, and 1993. In 1993, knee radiographs were assessed in pai rs (1984 and 1993), and hip radiographs were scored by 2 renders indiv idually without knowledge of running status. Results, Nine year radiog raphic results for both runners and nonrunners for the knees showed si gnificant within-group progression of both osteophytes and total knee radiographic scores (p = 0.01 for runners and p = 0.05 for nonrunners) and joint space narrowing in nonrunners (p = 0.01). Runners tended to have higher radiographic scores, bur no significant differences in be tween-group differences were seen in 1984 or 1993. Radiographic OA of the hip was not different between the groups. QCT of the first lumbar vertebrae for BMD in 1984, 1986, 1989, and 1993 was greater in runners than nonrunners (p = 0.01), but rates of change in QCT values were si milar between the 2 groups (p < 0.001). Conclusion. The presence of ra diographic hip OA and the progression of radiographic knee OA was simi lar for older runners and nonrunners. Lumbar spine BMD remained higher in runners, but changes in lumbar BMD were similar for runners and no nrunners over a 9 year period.