Table 1.

List of procedures and billing codes used as the primary outcome measure of endstage knee arthritis requiring reconstructive surgery

Procedure and billing code after 1996/97 fiscal year	Procedure and billing code prior to 1996/97 fiscal year
56662 Total knee arthroplasty	5519 Knee prosthesis
56661 Unicompartmental knee arthroplasty	5520 Arthroplasty knee
56664 Revision knee arthroplasty	5524 Knee revision (arthroplasty)
56602 High tibial osteotomy	5461 Osteotomy, major bones
56603 Osteotomy tibia shaft	5530 Arthrodesis knee, shoulder, elbow, ankle
56810 Knee arthrodesis