Unicompartmental Knee Arthroplasty

Borus, Todd; Thornhill, Thomas S.

doi:10.5435/00124635-200801000-00003

Cited by 202 publications

(127 citation statements)

References 40 publications

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“…Unicompartmental knee arthroplasty (UKA) can provide durable pain relief and functional improvement in greater than 90% of patients with focal arthritis or osteonecrosis of the medial or lateral compartments of the knee [3]. It is used in approximately 10% of knees in the United States managed with arthroplasty [12].…”

Section: Introductionmentioning

confidence: 99%

“…Hernigou and Deschamps reported a propensity to aseptic failure when the tibial component was implanted with a posterior slope greater than 7°, particularly with a deficient or lax anterior cruciate ligament [9]. Others have reported that the mechanical alignment of the limb, a surrogate of component alignment, can influence the durability of the prosthesis after UKA, although the ideal range of alignment in UKA, and whether under-or overcorrection is better tolerated, remains a source of debate [3,5,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…As many as 40% to 60% of components may be malaligned more than 2°from the preoperative plan with conventional methods [4,10]. Although the precise range of coronal and sagittal component alignment and mechanical axis is not entirely known, there is agreement that variance beyond a safe range can predispose to aseptic loosening of the prosthesis components [3,5,8,9]. Additionally, the range of component alignment varies considerably, even in the hands of skilled knee surgeons [5].…”

Section: Introductionmentioning

confidence: 99%

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Robotic Arm-assisted UKA Improves Tibial Component Alignment: A Pilot Study

Lonner

John

Conditt³

2010

Clinical Orthopaedics &Amp; Related Research

188

114

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The alignment of the components of unicompartmental knee arthroplasty (UKA) reportedly influences outcomes and durability. A novel robotic arm technology has been developed with the expectation that it could improve the accuracy of bone preparation in UKA. During the study period, we compared the postoperative radiographic alignment of the tibial component with the preoperatively planned position in 31 knees in 31 consecutive patients undergoing UKA using robotic arm-assisted bone preparation and in 27 consecutive patients who underwent unilateral UKA using conventional manual instrumentation to determine the error of bone preparation and variance with each technique. Radiographically, the root mean square error of the posterior tibial slope was 3.1°w hen using manual techniques compared with 1.9°when using robotic arm assistance for bone preparation. In addition, the variance using manual instruments was 2.6 times greater than the robotically guided procedures. In the coronal plane, the average error was 2.7°± 2.1°more varus of the tibial component relative to the mechanical axis of the tibia using manual instruments compared with 0.2°±

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Robotic Arm-assisted UKA Improves Tibial Component Alignment: A Pilot Study

Lonner

John

Conditt³

2010

Clinical Orthopaedics &Amp; Related Research

188

114

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“…Over the last ten years, less invasive and minimally invasive (MIS) surgery has re-popularised unicompartmental knee arthroplasty (UKA) [1]. UKA is challenging, as much for its indication as for its surgical technique, and it had not seen any considerable improvements for decades.…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that the survivorship of UKA is mainly related to leg alignment [1,[4][5][6]. Leg alignment hypercorrection after UKA leads to early wear on the opposite side of the knee joint, and conversely hypocorrection can lead to premature wear of the implant, or worse, tibial implant loosening.…”

Section: Introductionmentioning

confidence: 99%

Navigation of the tibial plateau alone appears to be sufficient in computer-assisted unicompartmental knee arthroplasty

Saragaglia

Picard

Refaie

2012

International Orthopaedics (SICOT)

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Purpose The aim of this study was to present our technique to implant unicompartmental knee arthroplasty (UKA) using navigation and to give our first results regarding the accuracy of the device. Methods A total of 33 patients with medial femorotibial osteoarthritis (31) or avascular necrosis (2) were included in this study. The mean preoperative hip-knee-ankle (HKA) angle was 172.7±2.2°(range 167-177°) and the preoperative planning aimed to reach an HKA angle between 175 and 179°(177±2°), a tibial varus at 3±1°, which means a tibial mechanical angle (TMA) close to 87±1°, and posterior tibial slope at 3±2°. In all cases, we used the OrthoPilot® device with dedicated software allowing us to navigate only the tibial plateau. Results The preoperative plan was reached in 93.9 % of cases for HKA angle, 84.8 % for TMA and 100 % for the posterior slope. Conclusions Unicompartmental knee navigation is reliable. The navigation of only the tibial bone cut is a reasonable option as has been shown in this study. Its role is invaluable in the positioning of mobile-bearing UKA, where the risk of overcorrection should not be underestimated.

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Indications of unicompartmental knee arthroplasty

Barnes¹,

Scott²

2012

The Knee Joint

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Unicompartmental Knee Arthroplasty

Cited by 202 publications

References 40 publications

Robotic Arm-assisted UKA Improves Tibial Component Alignment: A Pilot Study

Robotic Arm-assisted UKA Improves Tibial Component Alignment: A Pilot Study

Navigation of the tibial plateau alone appears to be sufficient in computer-assisted unicompartmental knee arthroplasty

Indications of unicompartmental knee arthroplasty

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