Whether the incapacity starting on 19 March 2008 was a new illness episode or a continuation of the earlier knee condition.
The March 2008 incapacity resulted from a new affection, namely the popliteal cyst, not merely from the prior prosthesis operation.
The insurer’s medical adviser gave clear and repeated opinions; no cyst had been found at the November 2007 surgery; the insured had partially regained work capacity before 19 March 2008; the new total incapacity coincided with discovery of the cyst.