Charles Hartgrave v. City of Twin Falls and SIF

BURDICK, Chief Justice.

Charles Leroy Hartgrave brings this appeal from the Idaho Industrial Commission (the Commission). Hartgrave sustained injuries to his left knee while working for the City of Twin Falls (the City) on February 3, 2009, and August 23, 2012. Although Hartgrave's left knee injuries and corresponding treatments were covered by Idaho's Workers Compensation Act, Hartgrave contends the left knee injuries aggravated preexisting degenerative joint disease in his right knee and ultimately required a total knee arthroplasty (TKA) in his right knee. The Commission rejected…