To the Editor:Dislocation of the mobile bearing is the most common reason for revisions in Asian patients who undergo Oxford mobile-bearing unicompartmental knee arthroplasty(Oxford MB UKA),with an incidence rate as h...To the Editor:Dislocation of the mobile bearing is the most common reason for revisions in Asian patients who undergo Oxford mobile-bearing unicompartmental knee arthroplasty(Oxford MB UKA),with an incidence rate as high as 7.9%.[1]Multiple studies have shown that the bearing dislocation rate is significantly higher in Asian than in Western patients.[2]A poor bearing movement trajectory was considered one of the risk factors.Malpositioning of the component results in a wider space between the margin of the bearing and the lateral wall of the tibial component,leading to a poor bearing movement trajectory and even bearing rotation.The superior surface is designed with high surrounding rims(higher in the anterior and posterior parts,lower in the medial and lateral parts).When rotation occurs,the lower rim loses its restriction to mutual movement of the bearing and femoral component,which leads to dislocation.展开更多
基金Capital Health Research and Development of Special(No.2020-24067)National Natural Science Foundation of China(Nos.81972130 and 82072494)Elite Medical Professionals project of China-Japan Friendship Hospital(No.ZRJY2021-GG08)
文摘To the Editor:Dislocation of the mobile bearing is the most common reason for revisions in Asian patients who undergo Oxford mobile-bearing unicompartmental knee arthroplasty(Oxford MB UKA),with an incidence rate as high as 7.9%.[1]Multiple studies have shown that the bearing dislocation rate is significantly higher in Asian than in Western patients.[2]A poor bearing movement trajectory was considered one of the risk factors.Malpositioning of the component results in a wider space between the margin of the bearing and the lateral wall of the tibial component,leading to a poor bearing movement trajectory and even bearing rotation.The superior surface is designed with high surrounding rims(higher in the anterior and posterior parts,lower in the medial and lateral parts).When rotation occurs,the lower rim loses its restriction to mutual movement of the bearing and femoral component,which leads to dislocation.
