Comparison of a Mobile With a Fixed-Bearing Unicompartmental Knee Implant

No Long-term Difference Between Fixed and Mobile Medial Unicompartmental Arthroplasty

“…The surgeon's fear of dislocation may lead to increase the polyethylene high and this may lead to an overcorrection of the deformation and consecutively to early arthritis progression in the lateral compartment as described in previous studies [11,38,40,41]. We also observed five cases of progression of arthritis in the lateral compartment and within these five cases, three had early progression of osteoarthritis in the lateral compartment at a mean of 3.9 years related to overcorrection of the deformation.…”

“…Despite these limitations, we report a comparative study of two comparable groups of patients with a long-term followup operated on in the same department by the two senior authors. The Knee Society scores [18] were comparable in the two groups and comparable with the function scores reported in the literature with excellent pain relief in the treatment of the medial compartment arthritis (Table 5) [7,9,11,25,38,41]. In vivo kinematic studies suggest patients implanted with fixed-bearing UKA have kinematics close to the normal knee despite some cases of paradoxical anterior translation seen over time [3].…”

“…Higher early minor reintervention rates for the mobile-bearing UKA were reported [7,8,11,41]. Comparative studies did not find any differences in terms of survivorship; however, the followup was limited [7,8,11,25,41]. Our goal was therefore to compare the long-term function and survivorship of fixedand mobile-bearing UKA.…”

“…All but one of the previous comparative studies between fixed and mobile studies in the literature did not compare the rate of radiolucencies [7,9,11,25,38,41]. Li et al [25] in a prospective comparative randomized study did find a higher rate of radiolucencies in the fixed-bearing group at 2 years with comparable clinical scores and survivorship and no longer followup [25].…”

“…Earlier studies comparing the reintervention rate [8] and the short-and midterm survivorship [9,11,41] after fixed-or mobilebearing UKA suggested a higher early minor reintervention rate for the mobile-bearing UKA [8]. However, whether the long-term function and survivorship are similar is unclear.…”