Successful Salvage of a Recurrently Dislocating Oxford Medial Unicompartmental Bearing

Tienen, T.G. van; Taylor, Susan; Brink, Rodney B.

doi:10.1016/j.arth.2009.02.010

Cited by 7 publications

(6 citation statements)

References 7 publications

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“…If there is implant loosening, MCL damage, or a serious mismatch between flexion and extension gaps, conversion to TKA is recommended. When the cause of bearing dislocation is impingement of the bearing against retained cement or osteophytes, insertion of a new bearing can be considered after removal of the bone or cement that may be impinging on the bearing if both the femoral and tibial implants are securely fixed with good alignment 8) .…”

Section: Introductionmentioning

confidence: 99%

Redislocation after Bearing Exchange for the Treatment of Mobile Bearing Dislocation in Medial Unicompartmental Knee Arthroplasty

Kim

Lee

et al. 2018

Knee Surg Relat Res

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PurposeThis study was conducted to investigate the outcomes of bearing exchange for the treatment of mobile bearing dislocation in medial unicompartmental knee arthroplasty (UKA).Materials and MethodsWe retrospectively reviewed 18 patients (15 females and 3 males, mean age of 65 years) treated with bearing exchange following mobile bearing dislocation in medial UKA. The occurrence of bearing redislocation, the Oxford Knee Score, and radiographic changes at the last follow-up were investigated.ResultsBearing redislocation after bearing exchange occurred in 9 of 18 patients (50%). Of these 9 patients, 7 underwent conversion to total knee arthroplasty after bearing redislocation. The 9 patients without bearing redislocation showed good to excellent clinical outcomes at a mean follow-up of 55 months after bearing exchange. The non-redislocation group had a higher percentage of posterior dislocation of the bearing than the redislocation group (55.5% vs. 22.2%, p=0.040). Univariate logistic regression analysis showed no significant risk factors for bearing redislocation.ConclusionsThis study showed a high rate of bearing redislocation after isolated, mobile bearing exchange for bearing dislocation following medial UKA. Therefore, bearing exchange as a sole treatment should be carefully considered in selected patients with correctable causes of bearing dislocation.

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Section: Introductionmentioning

confidence: 99%

Redislocation after Bearing Exchange for the Treatment of Mobile Bearing Dislocation in Medial Unicompartmental Knee Arthroplasty

Kim

Lee

et al. 2018

Knee Surg Relat Res

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“…Displacement is usually the result of impingement of the bearing against retained osteophytes [6], protruding cement or bone anterior to the femoral component. Distraction is likely to occur if there is damage to the medial collateral ligament (MCL) or if the flexion/extension gaps are not equal.…”

Section: Discussionmentioning

confidence: 99%

Posterior dislocation of the Oxford knee meniscal bearing: a treatment option

Tibrewal

Pandit

McLardy-Smith

et al. 2013

J Orthopaed Traumatol

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Unicompartmental knee replacement (UKR) is now established as a treatment for medial compartment arthritis. The Oxford UKR (Biomet Orthopedics, Inc, Warsaw, IN, USA) has a mobile-bearing system, which minimizes wear. This has been shown to provide excellent long-term results. Dislocation of the mobile-bearing device is rare with an incidence of 1 in 200 (0.5 %). The treatment usually involves exploration of the knee through the original anteromedial incision, removal of the dislocated bearing and rectification of the underlying cause for the dislocation. We describe two cases of a posterior dislocation in which the mobile bearing could not be retrieved and was left in situ. In both cases a good outcome was achieved. We conclude that in extremely rare cases where a dislocated bearing has migrated posteromedially and cannot be retrieved, it can be left in place rather than exploring the joint acutely through a separate posterior incision.

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“…Increased rates of dislocation are associated with varus positioning of the tibial component7 and are more frequent in the first year postoperatively 8. The dislocated mobile bearing can be reduced both by open and closed techniques 9. The closed technique can be used to relocate the bearing in cases which are uncomplicated and are diagnosed promptly.…”

Section: Discussionmentioning

confidence: 99%

Successful revision of polyethylene only, after delayed presentation of a dislocated bearing in an Oxford unicompartmental knee replacement

Gul

Davies

2013

BMJ Case Reports

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SUMMARYWe present the case of a 79-year-old man who dislocated the mobile bearing of a well-functioning Oxford unicompartmental knee replacement in a fall. The diagnosis was delayed by 14 days during which time the patient remained fully mobile. At the time of arthrotomy, there was some visible burnishing of the femoral articular surface where it had been rubbing on the tibial component. Both components were soundly fixed and had been functioning well for 7 years. The decision was made to leave the components in situ and simply replace the mobile meniscal bearing. The patient returned to full normal activity and has been followed-up for 3.5 years. Serial X-rays reveal no evidence of polyethylene wear and the knee remains pain free and fully functional. We conclude that it is safe to retain the components of an Oxford unicompartmental knee replacement despite some evidence of surface damage. Replacing just the mobile meniscus gave a good result in our patient. BACKGROUND

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Successful Salvage of a Recurrently Dislocating Oxford Medial Unicompartmental Bearing

Cited by 7 publications

References 7 publications

Redislocation after Bearing Exchange for the Treatment of Mobile Bearing Dislocation in Medial Unicompartmental Knee Arthroplasty

Redislocation after Bearing Exchange for the Treatment of Mobile Bearing Dislocation in Medial Unicompartmental Knee Arthroplasty

Posterior dislocation of the Oxford knee meniscal bearing: a treatment option

Successful revision of polyethylene only, after delayed presentation of a dislocated bearing in an Oxford unicompartmental knee replacement

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