Unicompartmental Knee Arthroplasty

Deshmukh, Rahul V.; Scott, Richard D.

doi:10.1097/00003086-200111000-00035

Cited by 206 publications

(88 citation statements)

References 21 publications

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“…In our registry, the CRR is higher for primary UKA compared with TKA, indicating a decreased overall survivorship for UKA compared with TKA, a finding consistent with those reported previously [8,9,15,17,20]. In contrast, no difference was found in the secondary CRR between the rev-UKA and rev-TKA groups.…”

Section: Discussionsupporting

confidence: 90%

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Registry Outcomes of Unicompartmental Knee Arthroplasty Revisions

Dudley

Gioe

Sinner

et al. 2008

Clinical Orthopaedics &Amp; Related Research

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Perceptions of the difficulty and outcome of unicompartmental knee arthroplasty revision (rev-UKA) vary. We analyzed differences in the complexity, cost, and survival of rev-UKAs compared with revision TKAs (rev-TKA). One hundred eighty knee arthroplasty revisions (68 rev-UKAs/112 rev-TKAs), defined as a minimum of tibial or femoral component revision, were identified from a community joint registry of 7587 knee implants performed between 1991 and 2005. Four of 68 rev-UKAs (5.9%) were revised a second time, whereas seven of 112 rev-TKAs (6.3%) were rerevised. Rev-TKA was predictably more complex than rev-UKA based on the proxies of operative time, use of modular augmentation and stems, and polyethylene liner thickness. Thirty-nine of 68 rev-UKAs (57%) had no form of augmentation and were revised as primary TKAs. There were more rev-TKAs than rev-UKAs with an implant cost greater than $5200 (42% versus 12%) and hospital charges greater than $33,000 (48% versus 25%). We found no difference in survival between the groups. Although rev-UKAs had less surgical complexity and bone loss at the time of revision compared with rev-TKAs, we were unable to show improved survival of rev-UKAs compared with rev-TKAs. Rev-UKAs were associated with lower implant costs and hospital charges compared with rev-TKAs.

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Section: Discussionsupporting

confidence: 90%

“…Some reports have cited reliable UKA survivorship of greater than 90% for more than 10 years after implantation [1,11,19,21,26]. When compared with TKA as an index arthroplasty procedure, however, the cumulative revision rate for UKA tends to be higher [8,9,15,17,20].…”

Section: Introductionmentioning

confidence: 99%

Registry Outcomes of Unicompartmental Knee Arthroplasty Revisions

Dudley

Gioe

Sinner

et al. 2008

Clinical Orthopaedics &Amp; Related Research

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“…The primary outcome measure in this study was therefore survival. Previous studies mainly of fixed bearing UKR have identified a decrease in survival associated with increased weight or BMI [9][10][11] . There was no statistically significant difference in the implant survival between any of the sub-groups.…”

Section: Discussionmentioning

confidence: 99%

“…The cut off weight limit for UKR was broadened slightly by Deshmukh and Scott in 2001 to 90 kg 10 . In 2005, in a series of 73 fixed bearing, non-modular, all polyethylene tibial component UKRs it was found that, at a mean follow up of 40 months, a BMI >32 was associated with a four fold increase in the revision rate 11 .…”

Section: Introductionmentioning

confidence: 99%

Does body mass index affect the outcome of unicompartmental knee replacement?

et al. 2013

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“…Overcorrection of the deformity should be avoided. Many experienced surgeons advocate undercorrection of the mechanical axis by 2-3 [2,4,7,9,18] because overcorrection might result in mediolateral subluxation of the femorotibial articulation or in excessive force on the unresurfaced compartment with early secondary degeneration [5,8].…”

Section: Discussionmentioning

confidence: 99%

Minimally invasive unicompartmental knee replacement with a nonimage-based navigation system

Perlick

Bäthis

Tingart

et al. 2004

International Orthopaedics (SICOT)

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In a prospective study, two groups of 20 unicompartmental knee replacements (UKR) each were operated either using a CT-free navigation system or the conventional minimal invasive technique. Radiographic assessment of postoperative alignment was performed by long-leg coronal and lateral radiographs. The results revealed a significant difference between the two groups in favor of navigation. In the computer-assisted group, 95% of UKRs were in a range of 4-0 varus (mechanical axis) compared with 70% in the conventional group. The only inconvenience was a prolonged operation time (+19 min). Due to the limited exposure, the navigation system is helpful in achieving a more precise component orientation. The danger of overcorrection is diminished by real-time information about the leg axis at each step during the operation.RØsumØ Dans une Øtude prospective, deux groupes de 20 proth ses unicompartimentales de genou ont ØtØ opØrØs soit en utilisant un syst me de navigation sans scanner, soit par une technique mini-invasive habituelle. L'estimation de l'alignement postopØratoire a ØtØ faite avec des grandes radiographies frontales et sagittales coronales. Les rØsultats ont rØvØlØ une diffØrence notable entre les deux groupes en faveur de la navigation. Dans le groupe aidØ par ordinateur, 95% des cas Øtaient dans une gamme de 0 à 4 de varus comparØ à 70% dans le groupe conventionnel. Le seul inconvØnient Øtait un temps d'opØration prolongØ (+19 min). En raison de l'exposition limitØe, le syst me de navigation est utile pour donner une orientation plus prØcise aux implants. Le danger d'hypercorrection est diminuØ par l'information en temps rØel sur l'axe du membre à chaque temps de l'opØration. IntroductionIn several studies, excellent 10-year survivorships of unicompartmental knee replacement (UKR) have been reported [3,4,6]. A major advantage of UKR is that it can be performed through a small incision that need not be extended into the quadriceps tendon [1,16]. Despite the favor of preserving undamaged soft tissue, the surgeon has a reduced overview and is in risk of component malpositioning [8].Recently, navigation systems have been developed to improve the accuracy of component alignment in total knee arthroplasty (TKA), and the first follow-up results of computer-assisted TKA are promising [10,15]. To our knowledge, for computer-assisted UKR, only one study is available in the literature. Jenny et al. [12] reported superior results when using a navigation system in UKR compared with the standard procedure. There are only a few previous papers focussing on postoperative alignment after conventional UKR [11], especially when using a minimally invasive technique [8]. Fisher et al. reported significant differences of the postoperative leg alignment when comparing the results of minimally invasive versus open UKR [8].The aim of this prospective study was to analyze the accuracy of postoperative leg alignment and component orientation in minimally invasive, computer-assisted UKR when using a nonimage-based navigatio...

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Unicompartmental Knee Arthroplasty

Cited by 206 publications

References 21 publications

Registry Outcomes of Unicompartmental Knee Arthroplasty Revisions

Registry Outcomes of Unicompartmental Knee Arthroplasty Revisions

Does body mass index affect the outcome of unicompartmental knee replacement?

Minimally invasive unicompartmental knee replacement with a nonimage-based navigation system

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