Objective. To evaluate the findings in MRI-studies of the knee in recreatio
nal long-distance runners after competition and to assess the reversibility
of the findings.
Design and patients. Eight recreational long-distance runners underwent MRI
studies of the knee before, immediately after and 6-8 weeks after taking p
art in the Vienna City Marathon. The studies were evaluated regarding alter
ations of pre-existing lesions and new pathological findings.
Results. In six runners without major pre-existing alterations no negative
effects were experienced. In one runner with pre-existing grade III alterat
ions of the menisci, signs of progressive osteoarthritis were experienced 2
months after the competition. In all other cases increased meniscal signal
alterations and minor signal changes in the bone marrow after the race wer
e transitory.
Conclusion. In healthy individuals no negative long-term-effects were exper
ienced. Pre-existing high-grade lesions of the menisci might be a predispos
ing risk for osteoarthritis, triggered by the stress of long-distance runni
ng.