Introduction
aseptic loosening, medial osteoarthritis, impingement, cement mantle
The use of unicompartmental knee replacement (UKR) for patients with single-compartment medial osteoarthritis in the knee has increased during the past 20 years [For cemented UKR components, aseptic loosening has been related to insufficient cement mantle with progressive peri-prosthetic radiolucent lines or impingement [Radiostereometric analysis (RSA) is a validated and highly accurate method to quantify the migration of prosthesis components that has been proposed as an important instrument in phased introduction of new component designs [The aim of the present study was: (1) to investigate the RSA-measured migration patterns of cementless twin-peg (CLTP), cemented twin-peg (CTP) and cemented single-peg (CSP) femoral components; and (2) to evaluate the potential association between component migration and peri-prosthetic BMD, radiolucent lines (RLL) and femoral component flexion angle.