scholarly journals Potential factors in postoperative dislocation of Oxford phase III mobile bearing UKA in Chinese patients: a single-center retrospective study

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Chenkai Li ◽  
Tao Li ◽  
Zian Zhang ◽  
Hui Huang ◽  
Tian Chen ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Knee Flexion ◽  
Mobile Bearing ◽  
Phase Iii ◽  
Chinese Patients ◽  
Surgical Volume ◽  
Unicompartmental Knee ◽  
Volume Group ◽  
Bearing Dislocation

Abstract Background Bearing dislocation is the main complication after mobile bearing unicompartmental knee arthroplasty. The purpose of this study was to analyze the potential risk factors of bearing dislocation after Oxford phase III mobile bearing unicompartmental knee arthroplasty in Chinese patients. Methods We retrospectively investigated 492 patients (578 knees) who underwent Oxford phase III mobile bearing unicompartmental knee arthroplasty in our institution between February 2009 and June 2019. The patients were divided into two groups based on surgeons’ annual surgical volume. Those with/ without bearing dislocation were compared based on patient, surgeon and implant factors. Results Among the 492 patients, 21 (4.3%, 4 men and 17 women) experienced bearing dislocation. Of these, 14 (4.0%) were in the high surgical volume group and 7 (5.1%) were in the low surgical volume group. Multivariate analysis revealed that trauma to the operated leg and daily life involving high knee flexion cumulatively predicted bearing dislocation (p < 0.05). Conclusions Trauma to the operated leg and daily life involving high knee flexion were risk factors for bearing dislocation after Oxford phase III mobile bearing unicompartmental knee arthroplasty.

scholarly journals New Instrumentation Reduces Operative Time in Medial Unicompartmental Knee Arthroplasty Using the Oxford Mobile Bearing Design

2015 ◽  
Vol 5 (4) ◽  
Author(s):  
Keith Berend ◽  
Jason Hurst ◽  
Michael Morris ◽  
Joanne Adams ◽  
Adolph Lombardi
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Operative Time ◽  
Mobile Bearing ◽  
Phase Iii ◽  
Unicompartmental Knee ◽  
Medial Unicompartmental Knee Arthroplasty ◽  
New Instrumentation ◽  
Time Savings ◽  
Bearing Design

Redesigned instrumentation has become available for implantation of the Oxford Mobile Bearing Medial unicompartmental knee arthroplasty. To assess the benefit of these changes, we compared operative time of 200 Phase III and 176 Microplasty UKA done 2008-2011. An average time savings of 8.6 minutes was seen with the Microplasty design.  Additionally, the standard deviation in operative times, minimum and maximum operatives were lower in knees in which Microplasty instrumentation was utilized.  A 15% savings in operative time was seen with the new Microplasty instrumentation. 

scholarly journals Bearing failure in a mobile bearing unicompartmental knee arthroplasty: an uncommon presentation of an implant-specific complication

Arthroplasty ◽  
2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Sravya P. Vajapey ◽  
Paul M. Alvarez ◽  
Douglas Chonko
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Mobile Bearing ◽  
Fracture Dislocation ◽  
Bearing Failure ◽  
Unicompartmental Knee ◽  
First Case ◽  
Uncommon Presentation ◽  
Initial Surgery ◽  
Bearing Dislocation

Abstract Background We present two cases of unicompartmental knee arthroplasty (UKA) bearing failure in this report—one case of bearing dislocation and one case of bearing fracture. The causes of failure in both cases are evaluated in depth and recommendations are provided regarding intraoperative technique to reduce risk of bearing failure in mobile bearing UKAs. Case presentation In the first case, intraoperative evidence of metallosis and chronic pain preceding the traumatic event may indicate that the patient had attenuation of her collateral ligaments that precipitated the instability event. In the second case, the relatively atraumatic nature of the bearing fracture-dislocation and intraoperative evidence of extensive poly wear suggest that the bearing fracture was likely due to a 3-mm bearing selection in the initial surgery. Conclusions This case report shows that late bearing in mobile bearing unicompartmental knee arthroplasty can often be a multifactorial event and treatment must address all the risk factors that led to bearing dislocation. Bearing fracture is a very rare complication associated with mobile bearing UKA and patients with thin polyethylene inserts are at risk for bearing fracture even in the absence of poly wear.

Late Mobile-Bearing Dislocation in Unicompartmental Knee Arthroplasty

Orthopedics ◽  
2018 ◽  
Vol 42 (1) ◽  
pp. e124-e127
Author(s):  
Moo-Ho Song ◽  
Kyung-Taek Kim ◽  
Youn-Soo Hwang ◽  
Jin-Wan Kim ◽  
Tae-Woong Eom ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Mobile Bearing ◽  
Unicompartmental Knee ◽  
Bearing Dislocation

scholarly journals Bearing dislocation of mobile bearing unicompartmental knee arthroplasty in East Asian countries: a systematic review with meta-analysis

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Xiaowei Sun ◽  
Pei Liu ◽  
Feifan Lu ◽  
Weiguo Wang ◽  
Wanshou Guo ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Subgroup Analysis ◽  
Meta Analysis ◽  
East Asian ◽  
Onset Time ◽  
Mobile Bearing ◽  
Dislocation Rate ◽  
Asian Countries ◽  
Bearing Dislocation

Abstract Background Bearing dislocation is a common postoperative complication of mobile-bearing unicompartmental knee arthroplasty, and East Asian patients tend to be at higher risk. However, whether this high dislocation rate is common in all East Asian populations remains unclear. This meta-analysis was performed to explore this issue and describe various features of dislocation in East Asians, including the onset time, dislocation direction, and re-dislocation rate. Methods The literature was searched in PubMed, Embase, Ovid, and Cochrane Library up to May 2020. Studies were scrutinized by two independent authors, and the bearing dislocation rate, onset time, direction, and re-dislocation rate were specifically analyzed. RevMan 5.3 was used for the statistical analysis. Results Seven case series from Korea, China, and Japan were included. The pooled analysis showed that the total dislocation rate was 2.37%, while the subgroup analysis showed that the dislocation rate in Korea and other countries was 4.50% and 0.74%, respectively (P < 0.01). Another subgroup analysis of the onset time showed a significant difference before and after the first 5 years postoperatively (P < 0.01). Anterior and posterior dislocations were more frequent than medial and lateral dislocations (P < 0.01). The average re-dislocation rate was 32.45%, which was approximately seven times higher than the primary dislocation rate (P < 0.01). Conclusion Our meta-analysis demonstrated that Korea had a higher bearing dislocation rate among East Asian countries, especially in the first 5 years after primary UKA. Anterior and posterior dislocations were common. The most important finding is that the re-dislocation rate can be much higher than the initial dislocation rate.

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