Proven accuracy for a new dynamic gap measurement in navigated TKA

2018 ◽  
Vol 27 (4) ◽  
pp. 1189-1195 ◽  
Author(s):  
Volkmar Mehliß ◽  
Marco Strauch Leira ◽  
Agustín Serrano Olaizola ◽  
Wolfgang Scior ◽  
Heiko Graichen
Keyword(s):  
Gap Measurement ◽  
Navigated Tka

scholarly journals Pros and cons of navigated versus conventional total knee arthroplasty—a retrospective analysis of over 2400 patients

2021 ◽  
Author(s):  
Matthias Meyer ◽  
Tobias Renkawitz ◽  
Florian Völlner ◽  
Achim Benditz ◽  
Joachim Grifka ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Retrospective Analysis ◽  
Outcome Measures ◽  
Knee Arthroplasty ◽  
Mechanical Axis ◽  
Complication Rates ◽  
Total Knee ◽  
One Year ◽  
Navigated Tka ◽  
Surgery Duration

Abstract Introduction Because of the ongoing discussion of imageless navigation in total knee arthroplasty (TKA), its advantages and disadvantages were evaluated in a large patient cohort. Methods This retrospective analysis included 2464 patients who had undergone TKA at a high-volume university arthroplasty center between 2012 and 2017. Navigated and conventional TKA were compared regarding postoperative mechanical axis, surgery duration, complication rates, one-year postoperative patient-reported outcome measures (PROMs) (WOMAC and EQ-5D indices), and responder rates as defined by the criteria of the Outcome Measures in Rheumatology and Osteoarthritis Research Society International consensus (OMERACT-OARSI). Results Both navigated (1.8 ± 1.6°) and conventional TKA (2.1 ± 1.6°, p = 0.002) enabled the exact reconstruction of mechanical axis. Surgery duration was six minutes longer for navigated TKA than for conventional TKA (p < 0.001). Complication rates were low in both groups with comparable frequencies: neurological deficits (p = 0.39), joint infection (p = 0.42 and thromboembolic events (p = 0.03). Periprosthetic fractures occurred more frequently during conventional TKA (p = 0.001). One-year PROMs showed excellent improvement in both groups. The WOMAC index was statistically higher for navigated TKA than for conventional TKA (74.7 ± 19.0 vs. 71.7 ± 20.7, p = 0.014), but the increase was not clinically relevant. Both groups had a similarly high EQ-5D index (0.23 ± 0.24 vs. 0.26 ± 0.25, p = 0.11) and responder rate (86.5% [256/296] vs. 85.9% [981/1142], p = 0.92). Conclusion Both methods enable accurate postoperative leg alignment with low complication rates and equally successful PROMs and responder rates one year postoperatively. Level of evidence III. Retrospective cohort study.

Alignment before and after component implantation in navigated TKA

2006 ◽  
Vol 39 ◽  
pp. S574
Author(s):  
A. Ensini ◽  
F. Catani ◽  
L. Bianchi ◽  
A. Leardini ◽  
S. Giannini
Keyword(s):  
Before And After ◽  
Navigated Tka

Thickness and air gap measurement of assembled IR objectives

2015 ◽  
Author(s):  
B. Lueerss ◽  
P. Langehanenberg
Keyword(s):  
Air Gap ◽  
Gap Measurement

Joint gap measurement in total knee arthroplasty using a tensor device with the same articulating surface as the prosthesis

2014 ◽  
Vol 134 (5) ◽  
pp. 699-705 ◽  
Author(s):  
Yoshio Matsui ◽  
Shigeru Nakagawa ◽  
Yukihide Minoda ◽  
Shigekazu Mizokawa ◽  
Yoshio Tokuhara ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Gap Measurement ◽  
Joint Gap ◽  
Total Knee ◽  
Articulating Surface

A Vision-Based Gap Detection Method during the Placement of Large-Scale Composite Structures

2011 ◽  
Vol 186 ◽  
pp. 11-15
Author(s):  
Li Cao ◽  
Wen Chen ◽  
Jun Xiao
Keyword(s):  
Image Processing ◽  
Video Processing ◽  
Composite Structures ◽  
Large Scale ◽  
Low Cost ◽  
High Quality ◽  
Detection Technology ◽  
Gap Measurement ◽  
Automatic Placement ◽  
On Line

Video processing technology is regarded as a low-cost detection technology in complex environment. Because the placement layer is thin and the surface is complex that causes high detection error and high cost in laser measurement. Two problems must be solved before using it in large-scale composite structures automatic placement. One is to obtain the high-quality and stable image, and the other is to improve efficiency of image processing. In this paper, a method obtaining the high quality placement gap images was studied. It made use of the optical characteristics of composite material’s surface texture. And some parameters were determined by experiments. To reduce the calculation cost of image processing, a placement gap measurement method based on line scanning was also proposed here. The method was effective in our detection experiments on an actual workpiece.

scholarly journals Conventional versus Smart Wireless Navigation in Total Knee Replacement: Similar Outcomes in a Randomized Prospective Study

Joints ◽  
2018 ◽  
Vol 06 (02) ◽  
pp. 090-094 ◽  
Author(s):  
Matteo Denti ◽  
Francesco Soldati ◽  
Francesca Bartolucci ◽  
Emanuela Morenghi ◽  
Laura De Girolamo ◽  
...  
Keyword(s):  
Statistical Significance ◽  
Tibial Slope ◽  
Computer Assisted ◽  
Level Of Evidence ◽  
Assisted Navigation ◽  
Level Ii ◽  
Before And After ◽  
Total Knee ◽  
Generation Computer ◽  
Navigated Tka

Purpose The development of new computer-assisted navigation technologies in total knee arthroplasty (TKA) has attracted great interest; however, the debate remains open as to the real reliability of these systems. We compared conventional TKA with last generation computer-navigated TKA to find out if navigation can reach better radiographic and clinical outcomes. Methods Twenty patients with tricompartmental knee osteoarthritis were prospectively selected for conventional TKA (n = 10) or last generation computer-navigated TKA (n = 10). Data regarding age, gender, operated side, and previous surgery were collected. All 20 patients received the same cemented posterior-stabilized TKA. The same surgical instrumentation, including alignment and cutting guides, was used for both the techniques. A single radiologist assessed mechanical alignment and tibial slope before and after surgery. A single orthopaedic surgeon performed clinical evaluation at 1 year after the surgery. Wilcoxon's test was used to compare the outcomes of the two groups. Statistical significance was set at p < 0.05. Results No significant differences in mechanical axis or tibial slope was found between the two groups. The clinical outcome was equally good with both techniques. At a mean follow-up of 15.5 months (range, 13–25 months), all patients from both groups were generally satisfied with a full return to daily activities and without a significance difference between them. Conclusion Our data showed that clinical and radiological outcomes of TKA were not improved by the use of computer-assisted instruments, and that the elevated costs of the system are not warranted. Level of Evidence This is a Level II, randomized clinical trial.

scholarly journals OP28.09: The levator-urethral gap measurement: tomographic ultrasound imaging (TUI) versus Omniview-volume contrast imaging (VCI)

2017 ◽  
Vol 50 ◽  
pp. 141-141
Author(s):  
L. Cariello ◽  
E. Montaguti ◽  
I. Cataneo ◽  
G. Dodaro ◽  
E. Margarito ◽  
...  
Keyword(s):  
Ultrasound Imaging ◽  
Contrast Imaging ◽  
Gap Measurement ◽  
Tomographic Ultrasound Imaging

scholarly journals Comparison of Internal Adaptation of Bulk-fill and Increment-fill Resin Composite Materials

2019 ◽  
Vol 44 (1) ◽  
pp. E32-E44 ◽  
Author(s):  
FS Alqudaihi ◽  
NB Cook ◽  
KE Diefenderfer ◽  
MC Bottino ◽  
JA Platt
Keyword(s):  
Composite Materials ◽  
Resin Composite ◽  
Aging Effect ◽  
Measured Data ◽  
Cavity Surface ◽  
Restorative Material ◽  
Tooth Structure ◽  
Gap Measurement ◽  
Internal Adaptation ◽  
Fill Materials

SUMMARY Objectives: To evaluate 1) the internal adaptation of a light-activated incremental-fill and bulk-fill resin-based composite (RBC) materials by measuring the gap between the restorative material and the tooth structure and 2) the aging effect on internal adaptation. Methods and Materials: Seventy teeth with class I cavity preparations were randomly distributed into five groups; four groups were restored with bulk-fill RBCs: Tetric EvoCeram Bulk Fill (TEC), SonicFill (SF), QuiXX Posterior Restorative (QX), and X-tra fil (XF); the fifth group was restored with incremental-fill Filtek Supreme Ultra Universal Restorative (FSU). One-half of the specimens of each group were thermocycled. Each tooth was sectioned, digital images were recorded, and the dimensions of any existing gaps were measured. Data were analyzed using analysis of variance (α=0.05). Results: FSU had the smallest gap measurement values compared with the bulk-fill materials except QX and TEC (p≤0.008). FSU had the smallest sum of all gap category values compared with the bulk-fill materials, except QX (p≤0.021). The highest gap incidence and size values were found at the composite/adhesive interface. All aged groups had greater gap values in regard to the gap measurement and the sum of all gap categories compared with non-aged groups. Significance: The incrementally placed material FSU had the highest internal adaptation to the cavity surface, while the four bulk-fill materials showed varied results. Thermocycling influenced the existing gap area magnitudes. The findings suggest that the incremental-fill technique produces better internal adaptation than the bulk-fill technique.

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