With regards to OA, “overall, more than one in two individuals had Kellgren-Lawrence grade 4 that could be considered severe radiographic changes in at least one compartment,” Dr. Filbay said at the meeting, which is sponsored by the Osteoarthritis Research Society International.
Severe radiographic changes were most common in the tibiofemoral joint, with around 47% having Kellgren-Lawrence (KL) grade 4. About 35% of tibiofemoral joints and about 60% of patellofemoral joints were KL grade 1.
Interestingly, different factors were found to be associated with OA in the tibiofemoral and patellofemoral joints, according to Dr. Filbay. Patients who had been treated non-surgically, whether initially or at any time during the 32-37 year follow-up, were more likely to have tibiofemoral OA, whereas those who had been treated surgically tended to have patellofemoral OA.
“Perhaps not surprisingly, meniscal injury at baseline was related to a higher percentage of tibiofemoral OA at long-term follow-up,” Dr. Filbay said.