The invention relates to a ceramic surface arthroplasty system, which consists of a convex, hemispherical, metallic implant (1) and a hollow hemispherical metal implant (3). The implants are coated with porcelain or zirconium oxide layer on their friction surfaces to avoid the creation of metallic microparticles. The convex implant (1) has a navel (4) on the thread (6) of which a bone-piercing pre-tensioning needle (7) is screwed and is tightened with a washer (9) at the area of the major trochanter or bulge. Further, it has protruding ribs (5) immersed on the surface of the head.

An improved polymer orthopedic implant and a method for making the same, where a portion of the implant for engagement with a patient's bone has a rough texture for encouraging micro-ingrowth between the bone and the implant. Substantially all remaining non-bone engaging portions of the implant are smooth for discouraging tissue ingrowth with the implant. The non-bone engaging portions of the implant are polished smooth, and are preferably transparent or translucent. The implant may be comprised of a slow reacting polymethylmethacrylate acrylic.