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Robertsson, O. et al. 1999. Use of unicompartmental instead of tricompart-mental 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. Acta Orthopaedica. 70, 2 (Jan. 1999), 170–175. DOI:https://doi.org/10.3109/17453679909011257.