The Experts below are selected from a list of 294231 Experts worldwide ranked by ideXlab platform
Xiaoxiao Zhou - One of the best experts on this subject based on the ideXlab platform.
-
RESEARCH ARTICLE Severe Pelvic Obliquity Affects Femoral Offset in Patients with Total Hip Arthroplasty but Not Leg-Length Inequality
2016Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunsu Chen, Xiaochun Peng, Yuanqing Mao, Yang Yang, Xiuhui Wang, Tingting TangAbstract:Leg-length inequality is an extensively studied complication of total hip arthroplasty in nor-mal patients. However, few studies have focused on the pelvic Obliquity of coronal pelvic malrotation. We hypothesized that pelvic Obliquity with a fixed abduction/adduction contrac-ture deformity of the hip may intraoperatively affect the release of soft tissues, ultimately resulting in a leg-length inequality. This study also investigated whether the femoral and ver-tical offsets of total hip arthroplasty were correlated with pelvic Obliquity. This prospective study divided 98 patients into six groups based on the inclination of pelvic Obliquity before total hip arthroplasty. Leg-length inequality, variation of pelvic Obliquity, offset, and vertical offset were measured after total hip arthroplasty. Leg-length inequality and vertical offset were not significantly different among groups, whereas the variation of pelvic Obliquity was significantly higher in type IIC pelvic Obliquity than in other groups. Type IC pelvic Obliquity had a significantly shorter offset than did the other groups, which may have been an impor-tant factor leading to type IC pelvic Obliquity. Pelvic Obliquity exhibited no significant effect on leg-length inequality in patients with total hip arthroplasty. A shorter offset may be caused by the higher tension of the abductor in the operated hip, which may result in the for-mation of type IC pelvic Obliquity. Releasing the abductor contracture and restoring femoral offset are important for increasing hip stability and maintaining pelvic balance following total hip arthroplasty
-
Severe Pelvic Obliquity Affects Femoral Offset in Patients with Total Hip Arthroplasty but Not Leg-Length Inequality
PloS one, 2015Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunsu Chen, Xiaochun Peng, Yuanqing Mao, Yang Yang, Xiuhui Wang, Tingting TangAbstract:Leg-length inequality is an extensively studied complication of total hip arthroplasty in normal patients. However, few studies have focused on the pelvic Obliquity of coronal pelvic malrotation. We hypothesized that pelvic Obliquity with a fixed abduction/adduction contracture deformity of the hip may intraoperatively affect the release of soft tissues, ultimately resulting in a leg-length inequality. This study also investigated whether the femoral and vertical offsets of total hip arthroplasty were correlated with pelvic Obliquity. This prospective study divided 98 patients into six groups based on the inclination of pelvic Obliquity before total hip arthroplasty. Leg-length inequality, variation of pelvic Obliquity, offset, and vertical offset were measured after total hip arthroplasty. Leg-length inequality and vertical offset were not significantly different among groups, whereas the variation of pelvic Obliquity was significantly higher in type IIC pelvic Obliquity than in other groups. Type IC pelvic Obliquity had a significantly shorter offset than did the other groups, which may have been an important factor leading to type IC pelvic Obliquity. Pelvic Obliquity exhibited no significant effect on leg-length inequality in patients with total hip arthroplasty. A shorter offset may be caused by the higher tension of the abductor in the operated hip, which may result in the formation of type IC pelvic Obliquity. Releasing the abductor contracture and restoring femoral offset are important for increasing hip stability and maintaining pelvic balance following total hip arthroplasty.
-
Effect of Pelvic Obliquity on the Orientation of the Acetabular Component in Total Hip Arthroplasty
Journal of Arthroplasty, 2011Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunshu Chen, Hao Shen, Yao JiangAbstract:Abstract In infrapelvic Obliquity, coronal pelvic malrotation entails a change in the spatial location of the bony acetabulum. In the present study, 77 patients presented with infrapelvic Obliquity with types 1 and 2 hip pathologies in which the pelvis is lower and higher, respectively, on the short-leg side. The 2 types were classified into 3 subtypes (A, B, and C) according to the severity of the pelvic Obliquity (0°-3°, 3°-6°, and >6°). Angles of inclination of pelvic Obliquity postoperatively, anteversions, and inclinations (abduction angle) for acetabular components were measured after total hip arthroplasty. Increased inclination (mean, 8.79°) was observed in type 1C, where the angle of inclination to pelvic Obliquity postoperatively was minimally corrected. This increase may lead to cup instability. Rebalancing the pelvis in these cases with preoperative skeletal traction and/or sufficient release of hip contractures may be necessary. A correction of the mean inclination of the cup by 8.79° is required.
Masaru Higa - One of the best experts on this subject based on the ideXlab platform.
-
large correction in opening wedge high tibial osteotomy with resultant joint line Obliquity induces excessive shear stress on the articular cartilage
Knee Surgery Sports Traumatology Arthroscopy, 2018Co-Authors: Hiroshi Nakayama, Steffen Schroter, Chie Yamamoto, Tomoya Iseki, Ryo Kanto, Kenji Kurosaka, Shunichiro Kambara, Shinichi Yoshiya, Masaru HigaAbstract:The purpose of this study was to analyse the resultant stress induced by joint-line Obliquity after HTO for varus knee deformity using a three-dimensional (3D) finite element model analysis. The geometrical bone data used in this study were derived from commercially available human bone digital anatomy media. The 3D knee models were developed using 3D computer-aided design software. The articular surface was overlaid with a 2-mm-thick cartilage layer for both femoral and tibial condyles. Ligament structures were simulated based on properties reported in previous anatomical studies. Regarding the loading condition, isolated axial loads of 1200 N with lateral joint-line inclinations of 2.5°, 5°, 7.5°, and 10° in reference to the horizontal axis were applied to the femur to simulate the mechanical environment in a knee with joint-line Obliquity. A steep rise of shear stress in the medial compartment was noted in the model with Obliquity of 5° or more. This laterally directed shear stress exhibited an incremental increase in accordance with the Obliquity angle. The maximum shear stress value in the medial cartilage increased from 1.6 MPa for the normal knee to 3.3, 5.2, and 7.2 MPa in the joint-line Obliquity models with 5°, 7.5°, and 10° of Obliquity, respectively. The effects of HTO for varus knee deformity on the amount/distribution of stresses in the articular cartilage were analysed using a 3D finite element model. It was shown that joint-line Obliquity of more than 5° induced excessive shear stress in the tibial articular cartilage. A large amount of correction in OWHTO with a resultant joint-line Obliquity of 5° or more may induce detrimental stress to the articular cartilage. Double-level osteotomy should be considered as a surgical option in this situation.
-
Large correction in opening wedge high tibial osteotomy with resultant joint-line Obliquity induces excessive shear stress on the articular cartilage
Knee Surgery Sports Traumatology Arthroscopy, 2018Co-Authors: Hiroshi Nakayama, Steffen Schroter, Chie Yamamoto, Tomoya Iseki, Ryo Kanto, Kenji Kurosaka, Shunichiro Kambara, Shinichi Yoshiya, Masaru HigaAbstract:Purpose The purpose of this study was to analyse the resultant stress induced by joint-line Obliquity after HTO for varus knee deformity using a three-dimensional (3D) finite element model analysis. Methods The geometrical bone data used in this study were derived from commercially available human bone digital anatomy media. The 3D knee models were developed using 3D computer-aided design software. The articular surface was overlaid with a 2-mm-thick cartilage layer for both femoral and tibial condyles. Ligament structures were simulated based on properties reported in previous anatomical studies. Regarding the loading condition, isolated axial loads of 1200 N with lateral joint-line inclinations of 2.5°, 5°, 7.5°, and 10° in reference to the horizontal axis were applied to the femur to simulate the mechanical environment in a knee with joint-line Obliquity. Results A steep rise of shear stress in the medial compartment was noted in the model with Obliquity of 5° or more. This laterally directed shear stress exhibited an incremental increase in accordance with the Obliquity angle. The maximum shear stress value in the medial cartilage increased from 1.6 MPa for the normal knee to 3.3, 5.2, and 7.2 MPa in the joint-line Obliquity models with 5°, 7.5°, and 10° of Obliquity, respectively. Conclusions The effects of HTO for varus knee deformity on the amount/distribution of stresses in the articular cartilage were analysed using a 3D finite element model. It was shown that joint-line Obliquity of more than 5° induced excessive shear stress in the tibial articular cartilage. A large amount of correction in OWHTO with a resultant joint-line Obliquity of 5° or more may induce detrimental stress to the articular cartilage. Double-level osteotomy should be considered as a surgical option in this situation.
Tingting Tang - One of the best experts on this subject based on the ideXlab platform.
-
RESEARCH ARTICLE Severe Pelvic Obliquity Affects Femoral Offset in Patients with Total Hip Arthroplasty but Not Leg-Length Inequality
2016Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunsu Chen, Xiaochun Peng, Yuanqing Mao, Yang Yang, Xiuhui Wang, Tingting TangAbstract:Leg-length inequality is an extensively studied complication of total hip arthroplasty in nor-mal patients. However, few studies have focused on the pelvic Obliquity of coronal pelvic malrotation. We hypothesized that pelvic Obliquity with a fixed abduction/adduction contrac-ture deformity of the hip may intraoperatively affect the release of soft tissues, ultimately resulting in a leg-length inequality. This study also investigated whether the femoral and ver-tical offsets of total hip arthroplasty were correlated with pelvic Obliquity. This prospective study divided 98 patients into six groups based on the inclination of pelvic Obliquity before total hip arthroplasty. Leg-length inequality, variation of pelvic Obliquity, offset, and vertical offset were measured after total hip arthroplasty. Leg-length inequality and vertical offset were not significantly different among groups, whereas the variation of pelvic Obliquity was significantly higher in type IIC pelvic Obliquity than in other groups. Type IC pelvic Obliquity had a significantly shorter offset than did the other groups, which may have been an impor-tant factor leading to type IC pelvic Obliquity. Pelvic Obliquity exhibited no significant effect on leg-length inequality in patients with total hip arthroplasty. A shorter offset may be caused by the higher tension of the abductor in the operated hip, which may result in the for-mation of type IC pelvic Obliquity. Releasing the abductor contracture and restoring femoral offset are important for increasing hip stability and maintaining pelvic balance following total hip arthroplasty
-
Severe Pelvic Obliquity Affects Femoral Offset in Patients with Total Hip Arthroplasty but Not Leg-Length Inequality
PloS one, 2015Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunsu Chen, Xiaochun Peng, Yuanqing Mao, Yang Yang, Xiuhui Wang, Tingting TangAbstract:Leg-length inequality is an extensively studied complication of total hip arthroplasty in normal patients. However, few studies have focused on the pelvic Obliquity of coronal pelvic malrotation. We hypothesized that pelvic Obliquity with a fixed abduction/adduction contracture deformity of the hip may intraoperatively affect the release of soft tissues, ultimately resulting in a leg-length inequality. This study also investigated whether the femoral and vertical offsets of total hip arthroplasty were correlated with pelvic Obliquity. This prospective study divided 98 patients into six groups based on the inclination of pelvic Obliquity before total hip arthroplasty. Leg-length inequality, variation of pelvic Obliquity, offset, and vertical offset were measured after total hip arthroplasty. Leg-length inequality and vertical offset were not significantly different among groups, whereas the variation of pelvic Obliquity was significantly higher in type IIC pelvic Obliquity than in other groups. Type IC pelvic Obliquity had a significantly shorter offset than did the other groups, which may have been an important factor leading to type IC pelvic Obliquity. Pelvic Obliquity exhibited no significant effect on leg-length inequality in patients with total hip arthroplasty. A shorter offset may be caused by the higher tension of the abductor in the operated hip, which may result in the formation of type IC pelvic Obliquity. Releasing the abductor contracture and restoring femoral offset are important for increasing hip stability and maintaining pelvic balance following total hip arthroplasty.
Qi Wang - One of the best experts on this subject based on the ideXlab platform.
-
RESEARCH ARTICLE Severe Pelvic Obliquity Affects Femoral Offset in Patients with Total Hip Arthroplasty but Not Leg-Length Inequality
2016Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunsu Chen, Xiaochun Peng, Yuanqing Mao, Yang Yang, Xiuhui Wang, Tingting TangAbstract:Leg-length inequality is an extensively studied complication of total hip arthroplasty in nor-mal patients. However, few studies have focused on the pelvic Obliquity of coronal pelvic malrotation. We hypothesized that pelvic Obliquity with a fixed abduction/adduction contrac-ture deformity of the hip may intraoperatively affect the release of soft tissues, ultimately resulting in a leg-length inequality. This study also investigated whether the femoral and ver-tical offsets of total hip arthroplasty were correlated with pelvic Obliquity. This prospective study divided 98 patients into six groups based on the inclination of pelvic Obliquity before total hip arthroplasty. Leg-length inequality, variation of pelvic Obliquity, offset, and vertical offset were measured after total hip arthroplasty. Leg-length inequality and vertical offset were not significantly different among groups, whereas the variation of pelvic Obliquity was significantly higher in type IIC pelvic Obliquity than in other groups. Type IC pelvic Obliquity had a significantly shorter offset than did the other groups, which may have been an impor-tant factor leading to type IC pelvic Obliquity. Pelvic Obliquity exhibited no significant effect on leg-length inequality in patients with total hip arthroplasty. A shorter offset may be caused by the higher tension of the abductor in the operated hip, which may result in the for-mation of type IC pelvic Obliquity. Releasing the abductor contracture and restoring femoral offset are important for increasing hip stability and maintaining pelvic balance following total hip arthroplasty
-
Severe Pelvic Obliquity Affects Femoral Offset in Patients with Total Hip Arthroplasty but Not Leg-Length Inequality
PloS one, 2015Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunsu Chen, Xiaochun Peng, Yuanqing Mao, Yang Yang, Xiuhui Wang, Tingting TangAbstract:Leg-length inequality is an extensively studied complication of total hip arthroplasty in normal patients. However, few studies have focused on the pelvic Obliquity of coronal pelvic malrotation. We hypothesized that pelvic Obliquity with a fixed abduction/adduction contracture deformity of the hip may intraoperatively affect the release of soft tissues, ultimately resulting in a leg-length inequality. This study also investigated whether the femoral and vertical offsets of total hip arthroplasty were correlated with pelvic Obliquity. This prospective study divided 98 patients into six groups based on the inclination of pelvic Obliquity before total hip arthroplasty. Leg-length inequality, variation of pelvic Obliquity, offset, and vertical offset were measured after total hip arthroplasty. Leg-length inequality and vertical offset were not significantly different among groups, whereas the variation of pelvic Obliquity was significantly higher in type IIC pelvic Obliquity than in other groups. Type IC pelvic Obliquity had a significantly shorter offset than did the other groups, which may have been an important factor leading to type IC pelvic Obliquity. Pelvic Obliquity exhibited no significant effect on leg-length inequality in patients with total hip arthroplasty. A shorter offset may be caused by the higher tension of the abductor in the operated hip, which may result in the formation of type IC pelvic Obliquity. Releasing the abductor contracture and restoring femoral offset are important for increasing hip stability and maintaining pelvic balance following total hip arthroplasty.
-
Effect of Pelvic Obliquity on the Orientation of the Acetabular Component in Total Hip Arthroplasty
Journal of Arthroplasty, 2011Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunshu Chen, Hao Shen, Yao JiangAbstract:Abstract In infrapelvic Obliquity, coronal pelvic malrotation entails a change in the spatial location of the bony acetabulum. In the present study, 77 patients presented with infrapelvic Obliquity with types 1 and 2 hip pathologies in which the pelvis is lower and higher, respectively, on the short-leg side. The 2 types were classified into 3 subtypes (A, B, and C) according to the severity of the pelvic Obliquity (0°-3°, 3°-6°, and >6°). Angles of inclination of pelvic Obliquity postoperatively, anteversions, and inclinations (abduction angle) for acetabular components were measured after total hip arthroplasty. Increased inclination (mean, 8.79°) was observed in type 1C, where the angle of inclination to pelvic Obliquity postoperatively was minimally corrected. This increase may lead to cup instability. Rebalancing the pelvis in these cases with preoperative skeletal traction and/or sufficient release of hip contractures may be necessary. A correction of the mean inclination of the cup by 8.79° is required.
Xianlong Zhang - One of the best experts on this subject based on the ideXlab platform.
-
RESEARCH ARTICLE Severe Pelvic Obliquity Affects Femoral Offset in Patients with Total Hip Arthroplasty but Not Leg-Length Inequality
2016Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunsu Chen, Xiaochun Peng, Yuanqing Mao, Yang Yang, Xiuhui Wang, Tingting TangAbstract:Leg-length inequality is an extensively studied complication of total hip arthroplasty in nor-mal patients. However, few studies have focused on the pelvic Obliquity of coronal pelvic malrotation. We hypothesized that pelvic Obliquity with a fixed abduction/adduction contrac-ture deformity of the hip may intraoperatively affect the release of soft tissues, ultimately resulting in a leg-length inequality. This study also investigated whether the femoral and ver-tical offsets of total hip arthroplasty were correlated with pelvic Obliquity. This prospective study divided 98 patients into six groups based on the inclination of pelvic Obliquity before total hip arthroplasty. Leg-length inequality, variation of pelvic Obliquity, offset, and vertical offset were measured after total hip arthroplasty. Leg-length inequality and vertical offset were not significantly different among groups, whereas the variation of pelvic Obliquity was significantly higher in type IIC pelvic Obliquity than in other groups. Type IC pelvic Obliquity had a significantly shorter offset than did the other groups, which may have been an impor-tant factor leading to type IC pelvic Obliquity. Pelvic Obliquity exhibited no significant effect on leg-length inequality in patients with total hip arthroplasty. A shorter offset may be caused by the higher tension of the abductor in the operated hip, which may result in the for-mation of type IC pelvic Obliquity. Releasing the abductor contracture and restoring femoral offset are important for increasing hip stability and maintaining pelvic balance following total hip arthroplasty
-
Severe Pelvic Obliquity Affects Femoral Offset in Patients with Total Hip Arthroplasty but Not Leg-Length Inequality
PloS one, 2015Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunsu Chen, Xiaochun Peng, Yuanqing Mao, Yang Yang, Xiuhui Wang, Tingting TangAbstract:Leg-length inequality is an extensively studied complication of total hip arthroplasty in normal patients. However, few studies have focused on the pelvic Obliquity of coronal pelvic malrotation. We hypothesized that pelvic Obliquity with a fixed abduction/adduction contracture deformity of the hip may intraoperatively affect the release of soft tissues, ultimately resulting in a leg-length inequality. This study also investigated whether the femoral and vertical offsets of total hip arthroplasty were correlated with pelvic Obliquity. This prospective study divided 98 patients into six groups based on the inclination of pelvic Obliquity before total hip arthroplasty. Leg-length inequality, variation of pelvic Obliquity, offset, and vertical offset were measured after total hip arthroplasty. Leg-length inequality and vertical offset were not significantly different among groups, whereas the variation of pelvic Obliquity was significantly higher in type IIC pelvic Obliquity than in other groups. Type IC pelvic Obliquity had a significantly shorter offset than did the other groups, which may have been an important factor leading to type IC pelvic Obliquity. Pelvic Obliquity exhibited no significant effect on leg-length inequality in patients with total hip arthroplasty. A shorter offset may be caused by the higher tension of the abductor in the operated hip, which may result in the formation of type IC pelvic Obliquity. Releasing the abductor contracture and restoring femoral offset are important for increasing hip stability and maintaining pelvic balance following total hip arthroplasty.
-
Effect of Pelvic Obliquity on the Orientation of the Acetabular Component in Total Hip Arthroplasty
Journal of Arthroplasty, 2011Co-Authors: Xiaoxiao Zhou, Qi Wang, Xianlong Zhang, Yunshu Chen, Hao Shen, Yao JiangAbstract:Abstract In infrapelvic Obliquity, coronal pelvic malrotation entails a change in the spatial location of the bony acetabulum. In the present study, 77 patients presented with infrapelvic Obliquity with types 1 and 2 hip pathologies in which the pelvis is lower and higher, respectively, on the short-leg side. The 2 types were classified into 3 subtypes (A, B, and C) according to the severity of the pelvic Obliquity (0°-3°, 3°-6°, and >6°). Angles of inclination of pelvic Obliquity postoperatively, anteversions, and inclinations (abduction angle) for acetabular components were measured after total hip arthroplasty. Increased inclination (mean, 8.79°) was observed in type 1C, where the angle of inclination to pelvic Obliquity postoperatively was minimally corrected. This increase may lead to cup instability. Rebalancing the pelvis in these cases with preoperative skeletal traction and/or sufficient release of hip contractures may be necessary. A correction of the mean inclination of the cup by 8.79° is required.
