METALS FOR TJA PAST PRESENT AND FUTURE 1900-19401940-196019701980199020002010 Stainless steel Cobalt-Chromium Alloy Titanium Oxinium Selection criteria 1--Inertness/Biocompatibility Strength Lower modulus I Scratch-resist. Lubrication Non-AllergenMETALS FOR TJA: METALS FOR TJA: PAST, PRESENT, AND FUTURE PAST, PRESENT, AND FUTURE 1900 -1940 1940 -1960 1970 1980 1990 2000 2010 ‌ ‌ Stainless Steel Stainless Steel ‌ Cobalt -Chromium Alloy Chromium Alloy ‌ Titanium Titanium ‌ Oxinium Oxinium Selection Criteria Selection Criteria ‌ ‌ Inertness/Biocompatibility Inertness/Biocompatibility ‌ Strength Strength ‌ Lower Modulus Lower Modulus ‌ ‌ Scratch Scratch -resist. resist. ‌ Lubricatious Lubricatious ‌ Non -Allergen. Allergen