Compliant prestress fixation in tumor prostheses: interface retrieval data.

This article reports the first available human retrieval data following the use of a new fixation system for tumor prostheses. The compliant prestress (CPS) fixation system obviates the need for long intramedullary stems. The CPS was designed to provide a stable, high-pressure, motion-free bone-implant interface that would prevent aseptic loosening and allow osseointegration at the bone-implant interface. At 10 months, the fourth patient in the human trial required amputation. Backscatter electron microscopy revealed a buttress of new bone had formed along 70% of the bone-metal interface, with excellent bony ingrowth (average: 42%) into the transverse, porous-coated titanium interface.