Use of unicompartmental instead of tricompartmental prostheses for unicompartmental arthrosis in the knee is a cost-effective alternative. 15 437 primary tricompartmental prostheses were compared with 10 624 primary medial or lateral unicompartmental prostheses. - Robertsson,O.; Borgquist,L.; Knutson,K.; Lewold,S.; Lidgren,L. (Acta Orthop Scand, 1999)