Orthopedic implants having gradient polymer alloys

This application is a continuation of U.S. patent application Ser. No. 16/579,375 filed Sep. 23, 2019, which is a continuation of U.S. patent application Ser. No. 15/394,297 filed Dec. 29, 2016, now U.S. Pat. No. 10,457,803, which is a continuation of U.S. patent application Ser. No. 13/347,647 filed Jan. 10, 2012, now abandoned, which is a continuation-in-part of U.S. patent application Ser. No. 13/219,348 filed Aug. 26, 2011, now U.S. Pat. No. 8,883,915, which claims the benefit of U.S. Provisional Application No. 61/377,844, filed Aug. 27, 2010 and of U.S. Provisional Application No. 61/383,705, filed Sep. 16, 2010. U.S. patent application Ser. No. 13/219,348 is a continuation-in-part of U.S. patent application Ser. No. 12/499,041, filed Jul. 7, 2009, now abandoned, which claims the benefit U.S. Provisional Application No. 61/078,741, filed Jul. 7, 2008, U.S. Provisional Application No. 61/079,060, filed Jul. 8, 2008, U.S. Provisional Application No. 61/095,273, filed Sep. 8, 2008,...