Judgment affirmed, with costs.
The petitioner has failed to sustain his burden of establishing a causal connection between his knee injuries of March 1977 and October 1981, and his disabling osteoarthritis (see, Matter of Christian v New York City Employees' Retirement Sys., 56 N.Y.2d 841, 843). Because it cannot be concluded on this record that the petitioner was entitled to an accidental disability pension as a matter of law, the Trustees' determination must be confirmed (see, Matter of Canfora v Board of Trustees, 60 N.Y.2d 347, 352). Bracken, J.P., Brown, Niehoff and Eiber, JJ., concur.