A diagnostic test kit for detecting the presence or absence of a protease within a test sample is provided. Voice message storing unit stores voice messages in association with respective message numbers. At least one seal clamp is mounted to the outboard end portion of the sector plate and slidingly engages the seal bar to hold the seal bar in close engagement with the sector plate and housing portion while allowing vertical relative movement between the seal bar and the sector plate. The top brace also includes a narrow section with horizontal hole that aligns with holes in brackets on the boom. Additionally, a trochlear drill guide may be used to facilitate establishing peg holes in the patient’s femur to receive corresponding pegs of the trochlear prosthesis.