In the work of numerical control reformation of general machine tool, the installation and debugging of machine tool is a crucial part. For the C6132 machine tool, and make the use of electrical and mechanical alignme...In the work of numerical control reformation of general machine tool, the installation and debugging of machine tool is a crucial part. For the C6132 machine tool, and make the use of electrical and mechanical alignment, parameter adjusting, numerical control lathe accuracy debugging and performance examination has been used to finish a series of tailing in the work of numerical control reformation of general machine tool. In this paper, the detailed process of electrical and mechanical alignment, parameter adjusting, numerical control lathe accuracy debugging and performance examination has been demonstrated, meanwhile, the specific operational approach of these work programs has been discussed. Therefore, the present results provides essential reference and approach for the numerical control reformation of general machine tool.展开更多
<b><span style="font-family:Verdana;">Background: </span></b><span style="font-family:Verdana;">The number of total knee arthroplasty (TKA) surgeries performed each ye...<b><span style="font-family:Verdana;">Background: </span></b><span style="font-family:Verdana;">The number of total knee arthroplasty (TKA) surgeries performed each year is increasing worldwide and mechanical alignment (MA) is currently seen as the gold standard procedure. However, taking neutral alignment as the universal goal may be mistaken. In our hospital, we currently conduct kinematically aligned TKA (KA-TKA). Three different types of implants are used</span><span style="font-family:Verdana;">:</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> the cruciate-retaining (CR) type, cruciate-sacrificing (CS) type, or bi-cruciate-retained (BCR) type. We aimed to compare the coronal alignment observed following KA-TKA and MA-TKA and in normal knees, as well as that achieved with different types of implants. </span><b><span style="font-family:Verdana;">Methods:</span></b><span style="font-family:Verdana;"> The study comprised 206 knees of Japanese patients who underwent KA-TKA using varying implants in our Hospital between May 2019 and April 2020. Measurements of pre- and postoperative coronal alignment were determined from weight-bearing full-leg standing radiographs. The postoperative results were </span><span style="font-family:Verdana;">compared to measurements taken from patients who underwent MA-TKA (</span><span style="font-family:Verdana;">N = 96) and normal knees (N = 60). </span><b><span style="font-family:Verdana;">Results: </span></b><span style="font-family:Verdana;">No significant differences between the KA-TKA group and normal knees were found for the medial proximal tibial angle (MPTA) (–4.2<span style="white-space:nowrap;">°</span> </span></span><span style="font-family:;" "=""><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> 2.6<span style="white-space:nowrap;">°</span> vs –3.8<span style="white-space:nowrap;">°</span> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> 2.5<span style="white-space:nowrap;">°</span>) or joint line orientation angle (JLOA) (0.2<span style="white-space:nowrap;">°</span> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> 1.9<span style="white-space:nowrap;">°</span> vs 0.3<span style="white-space:nowrap;">°</span> </span><span style="font-family:Verdana;">±</span><span><span style="font-family:Verdana;"> 1.4<span style="white-space:nowrap;">°</span>). However, when MA-TKA was compared to KA-TKA and normal knees, there were significant differences in both the MPTA and JLOA (</span><i><span style="font-family:Verdana;">p </span></i><span style="font-family:Verdana;">< 0.01). Furthermore, for the different implant types, MPTA exhibited significantly greater varus alignment when a CS-type was used than with the other two. </span><b><span style="font-family:Verdana;">Conclusions:</span></b><span style="font-family:Verdana;"> Here, we demonstrated that following KA-TKA, the articular surface of the tibia exhibited a similar varus alignment as that of normal knees, meaning that the technique reproduces the native knee. Furthermore, KA is patient-specific, and does not have the same failures as MA-TKA. Therefore, we anticipate a paradigm shift from mechanical to kinematic alignment, which may help reduce the dissatisfaction rate of TKA patients.</span></span></span>展开更多
文摘In the work of numerical control reformation of general machine tool, the installation and debugging of machine tool is a crucial part. For the C6132 machine tool, and make the use of electrical and mechanical alignment, parameter adjusting, numerical control lathe accuracy debugging and performance examination has been used to finish a series of tailing in the work of numerical control reformation of general machine tool. In this paper, the detailed process of electrical and mechanical alignment, parameter adjusting, numerical control lathe accuracy debugging and performance examination has been demonstrated, meanwhile, the specific operational approach of these work programs has been discussed. Therefore, the present results provides essential reference and approach for the numerical control reformation of general machine tool.
文摘<b><span style="font-family:Verdana;">Background: </span></b><span style="font-family:Verdana;">The number of total knee arthroplasty (TKA) surgeries performed each year is increasing worldwide and mechanical alignment (MA) is currently seen as the gold standard procedure. However, taking neutral alignment as the universal goal may be mistaken. In our hospital, we currently conduct kinematically aligned TKA (KA-TKA). Three different types of implants are used</span><span style="font-family:Verdana;">:</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> the cruciate-retaining (CR) type, cruciate-sacrificing (CS) type, or bi-cruciate-retained (BCR) type. We aimed to compare the coronal alignment observed following KA-TKA and MA-TKA and in normal knees, as well as that achieved with different types of implants. </span><b><span style="font-family:Verdana;">Methods:</span></b><span style="font-family:Verdana;"> The study comprised 206 knees of Japanese patients who underwent KA-TKA using varying implants in our Hospital between May 2019 and April 2020. Measurements of pre- and postoperative coronal alignment were determined from weight-bearing full-leg standing radiographs. The postoperative results were </span><span style="font-family:Verdana;">compared to measurements taken from patients who underwent MA-TKA (</span><span style="font-family:Verdana;">N = 96) and normal knees (N = 60). </span><b><span style="font-family:Verdana;">Results: </span></b><span style="font-family:Verdana;">No significant differences between the KA-TKA group and normal knees were found for the medial proximal tibial angle (MPTA) (–4.2<span style="white-space:nowrap;">°</span> </span></span><span style="font-family:;" "=""><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> 2.6<span style="white-space:nowrap;">°</span> vs –3.8<span style="white-space:nowrap;">°</span> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> 2.5<span style="white-space:nowrap;">°</span>) or joint line orientation angle (JLOA) (0.2<span style="white-space:nowrap;">°</span> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> 1.9<span style="white-space:nowrap;">°</span> vs 0.3<span style="white-space:nowrap;">°</span> </span><span style="font-family:Verdana;">±</span><span><span style="font-family:Verdana;"> 1.4<span style="white-space:nowrap;">°</span>). However, when MA-TKA was compared to KA-TKA and normal knees, there were significant differences in both the MPTA and JLOA (</span><i><span style="font-family:Verdana;">p </span></i><span style="font-family:Verdana;">< 0.01). Furthermore, for the different implant types, MPTA exhibited significantly greater varus alignment when a CS-type was used than with the other two. </span><b><span style="font-family:Verdana;">Conclusions:</span></b><span style="font-family:Verdana;"> Here, we demonstrated that following KA-TKA, the articular surface of the tibia exhibited a similar varus alignment as that of normal knees, meaning that the technique reproduces the native knee. Furthermore, KA is patient-specific, and does not have the same failures as MA-TKA. Therefore, we anticipate a paradigm shift from mechanical to kinematic alignment, which may help reduce the dissatisfaction rate of TKA patients.</span></span></span>