Authors: Schmalzried, TP Shepherd, EF Dorey, FJ Jackson, WO dela Rosa, M Fa'vae, F McKellop, HA McClung, CD Martell, J Moreland, JR Amstutz, HC

Citation: Tp. Schmalzried et al., Wear is a function of use, not time, CLIN ORTHOP, (381), 2000, pp. 36-46

Authors: Shepherd, EF Toloza, E McClung, CD Schmalzried, TP

Citation: Ef. Shepherd et al., Step activity monitor: Increased accuracy in quantifying ambulatory activity, J ORTHOP R, 17(5), 1999, pp. 703-708