A Wang and C Stark and J H DumbletonC R Bragdon and D O O'Connor and J D Lowenstein and M Jasty and W D SyniutaP Campbell and P Doorn and F Dorey and H C AmstutzV O SaikkoK Brummitt and C S HardakerK Brummitt and C S Hardaker and P J J McCullagh and K J Drabu and R A SmithR M Hall and A Unsworth and P Siney and B M WroblewskiG H Isaac and D Dowson and B M WroblewskiJ J O'Connor and J W GoodfellowR M Streicher and M Semlitsch and R Schon and H Weber and C RiekerG W Stachowiak and G B Stachowiak and P CampbellA Kobayashi and W Bonfield and Y Kadoya and T Yamac and M A R Freeman and G Scott and P A RevellJ G Lancaster and D Dowson and J FisherI C Clarke and V Good and L Anissian and A GustafsonI C Burgess and M Kolar and J L Cunningham and A UnsworthI D Learmonth and J L CunninghamI D Learmonth and E J Smith and J L CunninghamM A McGee and D W Howie and S D Neale and D R Haynes and M J PearcyM Semlitsch and H G WillertJ B Medley and J J Krygier and J D Bobyn and F W Chan and A Lippincott and M TanzerZ Lu and H McKellopB W WroblewskiJ P Paul

Editorial	p. i
Mechanistic and morphological origins of ultra-high molecular weight polyethylene wear debris in total joint replacement prostheses	p. 1
The importance of multidirectional motion on the wear of polyethylene	p. 17
Wear and morphology of ultra-high molecular weight polyethylene wear particles from total hip replacements	p. 27
A three-axis hip simulator for wear and friction studies on total hip prostheses	p. 35
Estimation of wear in total hip replacement using a ten station hip simulator	p. 47
Effect of counterface material on the characteristics of retrieved uncemented cobalt-chromium and titanium alloy total hip replacements	p. 51
Wear in retrieved Charnley acetabular sockets	p. 57
An investigation into the origins of time-dependent variation in penetration rates with Charrnley accetabular cups - wear, creep, or degradation?	p. 69
Theory and practice of meniscal knee replacement: designing against wear	p. 77
Metal-on-metal articulation for artificial hip joints: laboratory study and clinical results	p. 83
Application of numerical descriptors to the characterization of wear particles obtained from joint replacements	p. 93
The size and shape of particulate polyethylene wear debris in total joint replacements	p. 103
The wear of ultra-high molecular weight polyethylene sliding on metallic and ceramic counterfaces representative of current femoral surfaces in joint replacement	p. 109
Charnley wear model for validation of hip simulators--ball diameter versus polytetrafluoroethylene and polyethylene wear	p. 117
Development of a six station knee wear simulator and preliminary wear results	p. 129
Factors contributing to the wear of polyethylene in clinical practice	p. 141
The pathogenesis of osteolysis in two different cementless hip replacements	p. 151
The role of polyethylene wear in joint replacement failure	p. 157
Clinical wear behaviour of ultra-high molecular weight polyethylene cups paired with metal and ceramic ball heads in comparison to metal-on-metal pairings of hip joint replacements	p. 165
Kinematics of the MATCO hip simulator and issues related to wear testing of metal--metal implants	p. 181
Frictional heating of bearing materials tested in a hip joint wear simulator	p. 193
Wear in the high-density polyethylene socket in total hip arthroplasty and its role in endosteal cavitation	p. 201
Development of standards for orthopaedic implants	p. 211
Subject Index	p. 219
Authors' Index	p. 220