scholarly journals Comparison of Total Knee Arthroplasty Using Computer-Assisted Navigation versus Conventional Guiding Systems: A Prospective Study

2009 ◽  
Vol 17 (2) ◽  
pp. 170-173 ◽  
Author(s):  
CH Pang ◽  
WL Chan ◽  
CH Yen ◽  
SC Cheng ◽  
SB Woo ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Mechanical Axis ◽  
Varus Deformity ◽  
Osteoarthritis Of The Knee ◽  
Computer Assisted ◽  
Assisted Navigation ◽  
Alignment Correction ◽  
Total Knee ◽  
A Prospective Study

Purpose. To compare knee alignments in total knee arthroplasty (TKA) using computer-assisted navigation versus conventional guiding systems. Methods. Five men and 49 women aged 49 to 79 years underwent TKA for primary osteoarthritis of the knee with varus deformity. All valgus knees were associated with inflammatory arthritis and thus excluded. Computer-assisted navigation was used for the first 35 TKAs, whereas conventional extramedullary tibial and intramedullary femoral guiding systems were used for the next 35 TKAs. The mechanical axis, coronal tibial and femoral angles, sagittal tibial and femoral angles in the 2 groups were compared. Results. Sagittal tibial and femoral angles aligned more optimally in TKAs using computer-assisted navigation. In the respective computer-assisted navigation and conventional guiding systems, 33 (94%) and 26 (74%) of the TKAs attained a postoperative mechanical axis of <3° varus/valgus. Conclusion. Computer-assisted navigation gives a more consistent alignment correction and reduces outliers during implant positioning.

scholarly journals Postoperative radiologic outcome comparison between conventional and computer-assisted navigation total knee arthroplasty in extra-articular tibia vara

2020 ◽  
Vol 28 (1) ◽  
pp. 230949902090570 ◽  
Author(s):  
Yongun Cho ◽  
Hun-Kyu Shin ◽  
Eugene Kim ◽  
Jai Hyung Park ◽  
Se-Jin Park ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Lower Extremity ◽  
Knee Arthroplasty ◽  
Varus Deformity ◽  
Computer Assisted ◽  
Tibia Vara ◽  
Assisted Navigation ◽  
Significant Difference ◽  
Outcome Comparison ◽  
Total Knee

Purpose: Total knee arthroplasty (TKA) is the definite treatment for osteoarthritis. Meanwhile, significant inherent extra-articular varus angulation is associated with abnormal postoperative hip–knee–ankle (HKA) angle. Computer-assisted navigation TKA (CAS-TKA) used in patients who have severe varus deformity. The purpose of this study was to compare postoperative radiologic outcome between CAS-TKA and conventional TKA for extra-articular tibia vara. Methods: A retrospective review of postoperative HKA on standing lower extremity views was conducted in patients who underwent TKA by a single surgeon from 2010 to 2018, including knee with conventional TKA ( n = 83) and CAS-TKA ( n = 246). Extra-articular tibia vara was assessed by measuring the metaphyseal–diaphyseal angle (MDA) of the tibia in preoperative standing lower extremity view. Postoperative alignment was assessed by measuring the HKA in postoperative standing lower extremity view. Results: There was no significant difference in age ( p = 0.063), gender ( p = 0.628), body mass index ( p = 0.426), preoperative range of motion ( p = 0.524), preoperative HKA ( p = 0.306), preoperative MDA ( p = 0.523), or postoperative HKA ( p = 0.416) between the two groups (conventional TKA and CAS-TKA). There was no significant difference in postoperative alignment for cases with MDA ≤4° ( p = 0.351) or MDA >4° ( p = 0.866) in each group. There was a positive correlation between preoperative HKA and postoperative HKA in the CAS-TKA group ( p < 0.001, r = 0.243). However, there was no significant correlation between preoperative HKA and postoperative HKA in the conventional TKA group ( p = 0.732). Conclusions: There was no significant difference in postoperative alignment between conventional TKA and CAS-TKA in extra-articular tibial vara even for cases with MDA >4°.

scholarly journals Acquisition of coronal alignment according to the degree of varus deformity in total knee arthroplasty using computer-assisted navigation

2020 ◽  
Vol 28 (2) ◽  
pp. 230949902092626 ◽  
Author(s):  
Suk Kyoon Song ◽  
Myung Rae Cho ◽  
Seo Ho Lee ◽  
Hee Chan Kim ◽  
Dae won Kang ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Varus Deformity ◽  
Occurrence Rate ◽  
Computer Assisted ◽  
Coronal Alignment ◽  
Assisted Navigation ◽  
Total Knee ◽  
Group 2 ◽  
Group 1

Purpose: We have analyzed the surgical outcomes of primary total knee arthroplasty (TKA) using computer-assisted navigation that were performed by a single surgeon in terms of postoperative coronal alignment depending on preoperative varus deformity. Methods: We conducted a retrospective study of patients who have undergone navigated primary TKA from January 2016 through December 2019. Two hundred and fifty-six cases with varus deformity of 10° or less were assigned to group 1, and 216 cases with varus deformity of more than 10° were assigned to group 2. The postoperative mechanical hip–knee–ankle (mHKA) angle was measured from scanograms which were taken preoperatively and 3 months after surgery. The postoperative mHKA angle was targeted to be 0°, and the appropriate range of coronal alignment was set as 0 ± 3°. Results: The Pearson correlation showed a significant correlation with the degree of preoperative varus deformity and with the absolute error of postoperative mHKA ( p = 0.01). Among all patients, 64 cases (13.6%) were detected as outliers (mHKA > 0° ± 3°) at 3 months after surgery. Of the 64 cases, 25 cases (9.8%) were affiliated to group 1 and 39 cases (18.1%) were affiliated to group 2. Group 2 showed significantly higher occurrence of outliers than group 1 ( p = 0.01). Multiple variables logistic regression analysis, which analyzed the difference in the occurrence rate of outliers (mHKA > 0° ± 3°), showed that the occurrence rate of group 2 was 2.04 times higher than group 1. After adjusting for patient’s age, gender, and body mass index, the occurrence rate of outliers in group 2 was 2.01 times higher than group 1. Conclusion: The benefit of computer-assisted navigation during TKA in obtaining coronal alignment within 0 ± 3° may be lessened when the preoperative varus deformity is severely advanced.

scholarly journals Effects of computer-assisted navigation versus the conventional technique for total knee arthroplasty on levels of plasma thrombotic markers: a prospective study

2019 ◽  
Vol 18 (1) ◽  
Author(s):  
Ka-Kit Siu ◽  
Kwan-Ting Wu ◽  
Jih-Yang Ko ◽  
Feng-Sheng Wang ◽  
Wen-Yi Chou ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Conventional Technique ◽  
Conventional Group ◽  
Computer Assisted ◽  
Inclusion Criteria ◽  
Lower Plasma ◽  
Assisted Navigation ◽  
Total Knee ◽  
A Prospective Study

Abstract Background Venous thromboembolism (VTE) is a major sequela after total knee arthroplasty (TKA). We prospectively compared the differences in the perioperative plasma d-dimer and fibrinogen levels between the individuals undergoing TKA via computer-assisted navigation and via a conventional method as the surrogate comparison for VTE. There were 174 patients fulfilling the inclusion criteria and providing valid informed consent between September 2011 and November 2013. There were 69 females and 20 males in the navigation-assisted group (median age: 71.00 years), while the conventional group was composed of 59 females and 26 males (median age: 69.00 years). Blood samples were obtained prior to and at 24 and 72 h after surgery for measurement of the levels of plasma d-dimer and fibrinogen. Results A significantly lower plasma d-dimer level 24 h after TKA (p = 0.001) and a milder postoperative surge 24 h after TKA (p = 0.002) were observed in patients undergoing navigation-assisted TKA. The proportions of subjects exceeding the plasma d-dimer cut-off values of 7.5, 8.6 and 10 mg/L 24 h after TKA were all significantly higher in the conventional group than in the navigation-assisted group (p = 0.024, 0.004, and 0.004, respectively). Conclusions A lower plasma d-dimer level and a milder surge in the plasma d-dimer level were observed in patients undergoing navigation-assisted TKA in comparison with patients undergoing conventional TKA 24 h after surgery. These findings may supplement the known advantages of navigation-assisted TKA.

scholarly journals Postoperative laxity of the lateral soft tissue is largely negligible in total knee arthroplasty for varus osteoarthritis

2021 ◽  
Vol 29 (1) ◽  
pp. 230949902110020
Author(s):  
Seikai Toyooka ◽  
Hironari Masuda ◽  
Nobuhiro Nishihara ◽  
Takashi Kobayashi ◽  
Wataru Miyamoto ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Soft Tissue ◽  
Knee Arthroplasty ◽  
Mechanical Axis ◽  
Varus Deformity ◽  
Varus Knee ◽  
Before And After ◽  
Knee Deformity ◽  
Varus Stress ◽  
Total Knee

Purpose: To evaluate the integrity of lateral soft tissue in varus osteoarthritis knee by comparing the mechanical axis under varus stress during navigation-assisted total knee arthroplasty before and after compensating for a bone defect with the implant. Methods: Sixty-six knees that underwent total knee arthroplasty were investigated. The mechanical axis of the operated knee was evaluated under manual varus stress immediately after knee exposure and after navigation-assisted implantation. The correlation between each value of the mechanical axis and degree of preoperative varus deformity was compared by regression analysis. Results: The maximum mechanical axis under varus stress immediately after knee exposure increased in proportion to the degree of preoperative varus deformity. Moreover, the maximum mechanical axis under varus stress after implantation increased in proportion to the degree of preoperative varus deformity. Therefore, the severity of varus knee deformity leads to a progressive laxity of the lateral soft tissue. However, regression coefficients after implantation were much smaller than those measured immediately after knee exposure (0.99 vs 0.20). Based on the results of the regression formula, the postoperative laxity of the lateral soft tissue was negligible, provided that an appropriate thickness of the implant was compensated for the bone and cartilage defect in the medial compartment without changing the joint line. Conclusion: The severity of varus knee deformity leads to a progressive laxity of the lateral soft tissue. However, even if the degree of preoperative varus deformity is severe, most cases may not require additional procedures to address the residual lateral laxity.

scholarly journals Reliability of Imageless Computer-Assisted Navigation for Femoral Rotational Alignment in Total Knee Arthroplasty

2021 ◽  
Vol 15 (1) ◽  
pp. 79-84
Author(s):  
Leelasestaporn C ◽  
Thuwapitchayanant M ◽  
Sirithanapipat P ◽  
Sa-ngasoongsong P ◽  
Ruengsilsuwit P
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Rotational Alignment ◽  
Computer Assisted ◽  
Assisted Navigation ◽  
Total Knee

scholarly journals Accuracy of femoral rotational alignment in total knee arthroplasty using computer assisted navigation

2008 ◽  
Vol 13 (3) ◽  
pp. 167-172 ◽  
Author(s):  
Camilo Restrepo ◽  
William J. Hozack ◽  
Fabio Orozco ◽  
Javad Parvizi
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Rotational Alignment ◽  
Computer Assisted ◽  
Assisted Navigation ◽  
Total Knee
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