Accuracy of implantation of components in the Oxford knee using the minimally invasive approach

Shakespeare, David; Ledger, Michael; Kinzel, Vera

doi:10.1016/j.knee.2005.03.003

Cited by 34 publications

(33 citation statements)

References 9 publications

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“…However, this finding applies only to deviations reported in our patient population after a relatively short follow-up period of four to seven years. In the long term, deviant implant positions (i.e., if impingement occurs) may lead to increased polyethylene wear and may result in implant failure [6,15,27,28,32,33]. Therefore, long-term studies are necessary to define evidence-based tolerance limits for implant positions.…”

Section: Discussionmentioning

confidence: 99%

“…A tolerance within defined limits is accepted due to the fully congruent mobile bearing design. Nonetheless, some authors have shown that a substantial proportion of implants put in even by experienced surgeons can be found to be outside the proposed limits of tolerance [16,27]. We therefore performed a clinical and radiographic study to determine whether a deviant position of the implant had a negative influence on the postoperative clinical result.…”

Section: Introductionmentioning

confidence: 99%

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Correlation of positioning and clinical results in Oxford UKA

Clarius

Hauck

Seeger

et al. 2009

International Orthopaedics (SICOT)

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In a prospective clinical study, 59 patients with anteromedial osteoarthritis of the knee (61 knee joints) underwent minimally invasive medial Oxford unicompartmental arthroplasty phase 3. Clinical and radiographic examinations of 56 knees were carried out at five (4-7) years. American Knee Society (AKS) scores improved from mean 45.5 (20-80) points (knee score) and 55 (15-100) points (function score) before surgery to 90 (30-100) points in both scores after surgery. The position of each implant was determined on screened radiographs using an image intensifier. The implant position was analysed according to the Oxford X-ray rating system. We evaluated nine measures, and there was no detectable correlation between implant position and clinical result. However, long-term studies are needed before it is possible to elaborate an evidence-based guideline on positioning.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Correlation of positioning and clinical results in Oxford UKA

Clarius

Hauck

Seeger

et al. 2009

International Orthopaedics (SICOT)

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“…However, there has been a debate over the accuracy of implantation of UKR [2][3][4]. Poor positioning or inaccurate alignment of components may lead to poor functional results, early polyethylene wear and a high revision rate [5,6].…”

Section: Introductionmentioning

confidence: 99%

Influence of component alignment on outcome for unicompartmental knee replacement

et al. 2009

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“…There is no height difference between the line of tibial component joint surface and the lateral tibiofemoral joint space (LTF), the tibial component joint surface is parallel with the LTF joint space (4,5) and there is no change in tibial slope (TS) compared with the preoperative position in the sagittal plane (4,5). In frontal plane, the femoral component is perpendicular to the tibial component joint surface (4,5), the component is positioned centrally on the medial femoral condyle (6), in sagittal plane the anterior edge of femoral component is in the same level with the line of the remaining cartilage (7).…”

Section: Introductionmentioning

confidence: 99%

“…Several articles have been published about the range of acceptable components' malalignment (3)(4)(5)(6)(8)(9)(10)(11).…”

Section: Introductionmentioning

confidence: 99%

Medial Unicompartmental Knee Arthroplasty: Correlation Between Components’ Malalignment and Long-term Outcome in Obese Patients

Zsakai¹,

Nadianmehr²,

Oláh³

et al. 2017

Trauma Mon

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Background: The (UKA) is performed as an alternative to total knee arthroplasty (TKA) and high tibial osteotomy for unicompartmental osteoarthritis. Objectives: We examined whether the tolerable range of component malalignment is narrower in obese (BMI > 30) than in nonobese patients. Methods: We performed 163 consecutive all-poly medial UKA from 01/01/1995 to 31/10/2003. We examined 83 patients (88 knees) at a minimal follow-up period of 10 years. We examined the correlation between limb-and component malalignment and clinical outcome separately in the obese (67 knees) and nonobese (21 knees) group. Results: The 10-year prothesis survival was 92.8%, and 9 UKA were converted to total knee arthroplasty. The average time to revision was 84.44 (48 to 144) months. The 8 obese and 1 nonobese patients had slightly higher BMI (33.47) than the 83 long-term followed patients (31.72). In each of these 9 patients, knee score and functional score were poor. At every revision, we used stems and augments. In the obese group, the prosthetic joint space depression correlated with fair and poor knee and functional scores, the prosthetic joint space elevation is correlated with degenerative changes in lateral tibiofemoral joint. Conclusions:In the obese group, we noted at least 2 mm of prosthetic joint space depression in all of the 8 failured knees, and 4 mm or more than 4 mm in 6 cases. We hypothesize that the reason fot the subsidence of tibial component is the increased loading because of prosthetic joint space depression. The result of this study suggests that tibial component positioning which provides an optimal level of prosthetic joint space reduces the risk of failure in medial UKA, prevents degenerative changes in lateral tibiofemoral joint, and provides better long-term clinical outcome.

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Accuracy of implantation of components in the Oxford knee using the minimally invasive approach

Cited by 34 publications

References 9 publications

Correlation of positioning and clinical results in Oxford UKA

Correlation of positioning and clinical results in Oxford UKA

Influence of component alignment on outcome for unicompartmental knee replacement

Medial Unicompartmental Knee Arthroplasty: Correlation Between Components’ Malalignment and Long-term Outcome in Obese Patients

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