Primary stability of unicompartmental knee arthroplasty under dynamic flexion movement in human femora
Background: The objective of our study was to evaluate the impact of a trabecular stem fixation versus a cortical teeth fixation technique on the primary stability of cemented unicompartmental femoral components under dynamic flexion movement loading conditions in human femora. Methods: Ten fresh-frozen human knees of a mean donor age of 73.9years were used to perform medial unicompartmental knee arthroplasty under a less invasive parapatellar surgical approach. The femora were divided into two groups of matched pairs based on comparable trabecular bone mineral density. To assess the primary stability, a new method based on a combination of dynamic flexion movement, double-peak loading simulating stair climbing, kinematic analysis of the femoral component migration relative to the bone and an evaluation of the cement layer by fragments cut through the implant-cement-bone interface in the sagittal plane of the medial condyle was introduced. Findings: For the ''trabecular stem fixation'' technique the mean load to failure was 2340 (SD 650) N and for ''cortical teeth fixation'' it was 1080 (SD 455) N, with a substantially enhanced dynamic fixation strength for the ''trabecular stem fixation'' (p=0.008). In the distal area the cement layer of the ''trabecular stem fixation'' showed a significant decreased thickness compared to the ''cortical teeth fixation'' (p=0.029), while a substantially deeper cement penetration (p=0.044) has been achieved for the ''trabecular stem fixation''. Interpretation: From our observations, we conclude that there is a significantly enhanced primary stability with a ''trabecular stem fixation'' compared to a ''cortical teeth fixation'' technique of cemented unicompartmental femoral components, in terms of dynamic failure load and migration characteristics.
- 원문이 없습니다.
- DOI : http://dx.doi.org/10.1016/j.clinbiomech.2016.11.006
- Elsevier : 저널> 권호 > 논문
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기