The Stability of Cementless Tibial Trays During Functional Activities Is Explained by Variations in Bone Quality and Surgical Preparation

Description

This presentation from the ISTA 2024 conference held in Nashville, focuses on the challenges and methodologies involved in studying cementless total knee implants. The speaker, Professor Philip Noble, begins by acknowledging a conflict of interest due to their involvement in the design team of the persona implant being discussed. They highlight that cementless implants have a notably high failure rate, particularly in younger patients, which necessitates understanding the reasons behind micro-motion at the implant-bone interface.



Traditional approaches in research have often relied on idealized conditions, such as using sawbones or perfect interfaces, which do not represent the variability of human bone. Therefore, the speaker's group opted for a more phenomenological approach, involving experienced surgeons conducting operations on fresh cadaver specimens under realistic conditions. The aim was to meticulously study the implantation process and its effects on micro-motion, a vital factor influencing success rates.



Through their research, involving a combination of advanced imaging and mechanical testing, they identified critical factors contributing to micro-motion. Notably, they found that tibial flatness, the ratio of medial to lateral bone densities, and the positioning during implantation are significant predictors of implant stability. They conclude by stressing the importance of technique in surgical practice to enhance the outcomes of knee replacements and note the potential implications of their findings for future implant designs.

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