scholarly journals Accuracy of A CAOS Enhanced Mechanical Instrument System for Total Knee Arthroplasty

10.29007/2fdf ◽  
2018 ◽  
Author(s):  
Yifei Dai ◽  
James Huddleston ◽  
Matt Rueff ◽  
Laurent Angibaud ◽  
Derek Amanatullah
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Experience Level ◽  
Conventional Instruments ◽  
Surgeon Experience ◽  
Resident Surgeon ◽  
Conventional Instrumentation ◽  
Total Knee ◽  
Alignment Errors ◽  
Valgus Alignment

This study investigated the accuracy of a novel CAOS enhanced mechanical instrument system for TKA, and its sensitivity to surgeon’s experience level. Resection errors in varus/valgus alignment were assessed across senior, fellow, and resident surgeon groups, and compared between CAOS guided resections and resections performed with conventional instruments. The findings demonstrated that regardless of surgeon experience level, the CAOS enhanced mechanical instrumentation significantly reduced alignment errors compared to conventional instrumentation, along with substantial increases in the prevalence of optimal resections.

Varus/valgus alignment of the femur in total knee arthroplasty. Can accuracy be improved by pre-operative CT scanning?

The Knee ◽  
2004 ◽  
Vol 11 (3) ◽  
pp. 197-201 ◽  
Author(s):  
Vera Kinzel ◽  
Matthew Scaddan ◽  
Beverley Bradley ◽  
David Shakespeare
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Ct Scanning ◽  
Total Knee ◽  
Valgus Alignment

Handheld, accelerometer‐based navigation versus conventional instrumentation in total knee arthroplasty: a meta‐analysis

2020 ◽  
Vol 90 (10) ◽  
pp. 2068-2079 ◽  
Author(s):  
Zaid Shihab ◽  
Catriona Clayworth ◽  
Naveen Nara
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Meta Analysis ◽  
Conventional Instrumentation ◽  
Total Knee

CLINICAL AND RADIOLOGICAL RESULTS OF TOTAL KNEE REPLACEMENT USING PATIENT-SPECIFIC POSITIONING GUIDES WITH AT LEAST 5 YEARS OF FOLLOW-UP

2020 ◽  
pp. 2050020
Author(s):  
Xabier Foruria ◽  
Jesús Moreta ◽  
Carlos Jaramillo ◽  
Ane Anton ◽  
Isidoro Calvo ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Patient Specific ◽  
Knee Score ◽  
Conventional Instrumentation ◽  
Total Knee ◽  
The Mean ◽  
Clinical And Radiological Results ◽  
Coronal Malalignment

Objective: Patient-specific positioning guides have been designed to improve precision in total knee arthroplasty. The aim of this study is to evaluate the medium-term clinical and radiological outcomes with magnetic resonance imaging-based patient-specific positioning guides. Material and methods: We retrospectively reviewed patients from two centers treated with total knee arthroplasty performed with patient-specific positioning guides. We enrolled patients operated on between January 2011 and December 2013, with a minimum follow-up of 5 years. Preoperative and postoperative hip knee angle (HKA) and position of each component in the coronal plane were assessed. Overall malalignment was defined as an outlier of more than [Formula: see text] from the neutral mechanical axis and specific malalignment as when any component showed more than [Formula: see text] of deviation. Clinical outcomes were evaluated using the Hospital for Special Surgery (HSS) knee Score. Results: This study included 68 patients with a mean age of 72 years. The mean postoperative alignment (HKA) was [Formula: see text] and 26.5% of patients showed coronal malalignment [Formula: see text]. Regarding femoral components, 19.1% showed specific malalignment [Formula: see text], while 11.7% of tibial components were classified as outliers. The mean HSS Knee Score at final follow up was 89.2. Patients whose implants were mechanically aligned did not obtain better functional outcomes ([Formula: see text]). Conclusion: In our series, the use of patient-specific positioning guides resulted in a range of mechanical malalignment, similar to conventional instrumentation results reported in the literature.

Extramedullary Guide Alignment Is not Affected by Obesity in Primary Total Knee Arthroplasty

2020 ◽  
Author(s):  
Jocelyn Compton ◽  
Jessell Owens ◽  
Jesse Otero ◽  
Nicolas Noiseux ◽  
Timothy Brown
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Tibial Component ◽  
Primary Total Knee Arthroplasty ◽  
Coronal Plane ◽  
Coronal Alignment ◽  
Primary Tkas ◽  
Significant Difference ◽  
Total Knee ◽  
Valgus Alignment

AbstractCoronal alignment of the tibial implant correlates with survivorship of total knee arthroplasty (TKA), especially in obese patients. The purpose of this study was to determine if obesity affects coronal plane alignment of the tibial component when utilizing standard extramedullary tibial guide instrumentation during primary TKA. A retrospective review from June 2017 to February 2018 identified 142 patients (162 primary TKAs). There were 88 patients (100 knees) with body mass index (BMI) < 35 kg/m2 and 54 patients (62 knees) with BMI ≥ 35.0 kg/m2. The cohorts did not differ in age (p = 0.37), gender (p = 0.61), or Charlson's comorbidity index (p = 0.54). Four independent reviewers measured the angle between the base of the tibial component and the mechanical axis of the tibia on the anteroposterior view of long-leg film at first postoperative clinic visit. Outliers were defined as patients with greater than 5 degrees of varus or valgus alignment (n = 0). Reoperations and complications were recorded to 90 days postoperatively. There was no significant difference in mean tibial coronal alignment between the two groups (control alignment 90.8 ± 1.2 degree versus obese alignment 90.8 ± 1.2 degree, p = 0.91). There was no difference in varus versus valgus alignment (p = 0.19). There was no difference in the number of outliers (two in each group, p = 0.73). There was no difference in rate of reoperation (p = 1.0) or complication (p = 0.51). Obesity did not affect coronal plane alignment of the tibial component when using an extramedullary guide during primary TKA in our population.

scholarly journals Comparison of computer-assisted navigation and conventional instrumentation for bilateral total knee arthroplasty

Medicine ◽  
2019 ◽  
Vol 98 (47) ◽  
pp. e18083 ◽  
Author(s):  
Robert Wen-Wei Hsu ◽  
Wei-Hsiu Hsu ◽  
Wun-Jer Shen ◽  
Wei-Bin Hsu ◽  
Shr-Hsin Chang
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Computer Assisted ◽  
Bilateral Total Knee Arthroplasty ◽  
Assisted Navigation ◽  
Conventional Instrumentation ◽  
Total Knee

Comparison of Radiographic Alignment of Imageless Computer-Assisted Surgery vs Conventional Instrumentation in Primary Total Knee Arthroplasty

2011 ◽  
Vol 26 (8) ◽  
pp. 1273-1284.e1 ◽  
Author(s):  
William P. Barrett ◽  
J. Bohannon Mason ◽  
Joseph T. Moskal ◽  
David F. Dalury ◽  
Ali Oliashirazi ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Primary Total Knee Arthroplasty ◽  
Computer Assisted Surgery ◽  
Computer Assisted ◽  
Conventional Instrumentation ◽  
Total Knee ◽  
Radiographic Alignment ◽  
Primary Total Knee

Mid-term functional outcomes of patient-specific versus conventional instrumentation total knee arthroplasty: a prospective study

2021 ◽  
Author(s):  
Vikaesh Moorthy ◽  
Jerry Yongqiang Chen ◽  
Ming Han Lincoln Liow ◽  
Pak Lin Chin ◽  
Shi-Lu Chia ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Prospective Study ◽  
Knee Arthroplasty ◽  
Functional Outcomes ◽  
Patient Specific ◽  
Conventional Instrumentation ◽  
Total Knee ◽  
A Prospective Study

scholarly journals Patient-specific instrumentation improved three-dimensional accuracy in total knee arthroplasty: a comparative radiographic analysis of 1257 total knee arthroplasties

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Leo Pauzenberger ◽  
Martin Munz ◽  
Georg Brandl ◽  
Julia K. Frank ◽  
Philipp R. Heuberer ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Mechanical Axis ◽  
Three Dimensional ◽  
Mobile Bearing ◽  
Patient Specific ◽  
Limb Alignment ◽  
Patient Specific Instrumentation ◽  
Conventional Instrumentation ◽  
Total Knee

Abstract Background The purpose of this study was to compare restoration of mechanical limb alignment and three-dimensional component-positioning between conventional and patient-specific instrumentation in total knee arthroplasty. Methods Radiographic data of patients undergoing mobile-bearing total knee arthroplasty (n = 1257), using either conventional (n = 442) or patient-specific instrumentation (n = 812), were analyzed. To evaluate accuracy of axis restoration and 3D-component-positioning between conventional and patient-specific instrumentation, absolute deviations from the targeted neutral mechanical limb alignment and planned implant positions were determined. Measurements were performed on standardized coronal long-leg and sagittal knee radiographs. CT-scans were evaluated for accuracy of axial femoral implant rotation. Outliers were defined as deviations from the targeted neutral mechanical axis of > ± 3° or from the intraoperative component-positioning goals of > ± 2°. Deviations greater than ± 5° from set targets were considered to be severe outliers. Results Deviations from a neutral mechanical axis (conventional instrumentation: 2.3°± 1.7° vs. patient-specific instrumentation: 1.7°± 1.2°; p < 0.001) and numbers of outliers (conventional instrumentation: 25.8% vs. patient-specific instrumentation: 10.1%; p < 0.001) were significantly lower in the patient-specific instrumentation group. Significantly lower mean deviations and less outliers were detected regarding 3D-component-positioning in the patient-specific instrumentation compared to the conventional instrumentation group (all p < 0.05). Conclusions Patient-specific instrumentation prevented from severe limb malalignment and component-positioning outliers (> ± 5° deviation). Use of patient-specific instrumentation proved to be superior to conventional instrumentation in achieving more accurate limb alignment and 3D-component positioning, particularly regarding femoral component rotation. Furthermore, the use of patient-specific instrumentation successfully prevented severe (> 5° deviation) outliers.

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