Migration Of Cementless Tibial Baseplates Appears To Be Related To Bone Mineral Density

Description

This presentation from the ISTA 2024 conference held in Nashville, discusses a study on the relationship between the migration of base plates in cementless total knee arthroplasty and bone mineral density (BMD). The speaker begins by acknowledging the increasing use of cementless total knee replacements, attributed to the potential for enhanced longevity due to biological fixation. However, a major concern is that BMD, which indicates bone support strength, is not routinely measured in patients undergoing total knee arthroplasties. Surgeons often rely on proxies like age and sex when deciding on the use of cement.



The study attempts to provide more nuanced data by utilizing preoperative CT scans to analyze BMD in patients undergoing robotic uncemented total knee arthroplasty. The team examines the movement of the implant from six weeks to one year post-surgery, analyzing a group of eighteen patients aged 53 to 77. They compare the implant's position using fixed radiographic techniques that ensure precise geometry reconstruction. The results indicate a total point motion of up to 2mm across measurements with good observer agreement.



However, the correlation between implant migration and BMD appears weak, raising limitations due to the small sample size and the selective nature of the successful candidates studied. The speaker concludes with plans for future investigations, including a larger sample size and examining patients with varying BMD extremes to determine potential relationships. The findings suggest that current methodologies may not have accurately captured the interplay between BMD and implant migration in cementless knee arthroplasties.

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Conferences