The worker suffered a right knee injury in 1979, diagnosed as an anterior cruciate ligament tear, and later underwent a high tibial osteotomy in 1995.
In 2013, the worker required a total knee replacement.
The WSIB initially denied entitlement, concluding the surgery was for progressive degenerative changes not arising from the work injury.
On appeal, the Appeals Resolution Officer found clinical compatibility between the original injury and post-traumatic osteoarthritis, accepting the treating surgeon's opinion that the knee replacement was occasioned by the 1979 injury.
The worker's objection was allowed, granting entitlement to the surgery, associated health care benefits, and temporary total disability benefits.