To study the influence of head-neck ratio and implant position on the range of motion (ROM) after total hip arthroplasty (THA).Methods In this study the author established a three-dimensional computerized model of hip...To study the influence of head-neck ratio and implant position on the range of motion (ROM) after total hip arthroplasty (THA).Methods In this study the author established a three-dimensional computerized model of hip joint and tested the range of motion of three different head-neck ratio after total hip arthroplasty.Results Range of motion after total hip arthroplasty depended on design parameters such as head-neck ratio,but also on the implantation parameters such as the cup’s inclination and antevertion,the stem’s antevertion and their combination of each other.Optimal range of motion required compliant position of total hip components.The range of motion increased with the enlarging of head-hnck ratio.Conclusion Higher head-neck ratio leads to optimal range of motion and decreased the prevalence of prosthetic impingement within compliant,well-defined combination of cup’s inclination,cup’s antevertion and stem’s antevertion depending on the intended ROM.Domestic magnesium-silicon jade total hip prosthesis has too low head-neck ratio to result in enough range of motion that fulfilled daily living after total hip arthroplasty.14 refs,4 figs,3 tabs.展开更多
目的探讨股骨近端抗旋髓内钉(Proximal Femoral Nail Antirotation,PFNA)内固定术治疗股骨粗隆间骨折的疗效以及对患者的手术时间、出血量、术后疼痛和髋关节活动性的影响。方法简单随机选取2021年6月—2023年5月聊城市冠县人民医院诊治...目的探讨股骨近端抗旋髓内钉(Proximal Femoral Nail Antirotation,PFNA)内固定术治疗股骨粗隆间骨折的疗效以及对患者的手术时间、出血量、术后疼痛和髋关节活动性的影响。方法简单随机选取2021年6月—2023年5月聊城市冠县人民医院诊治的60例股骨粗隆间骨折患者作为研究对象,采用随机数表法将患者划分为研究组(n=30)和对照组(n=30)。对照组采用行动力髋螺钉(Dynamic Hip Screw,DHS)内固定术进行治疗,研究组采用PFNA内固定术治疗。比较两组的手术相关指标、Harris髓关节功能评分优良率、疼痛评分及并发症发生率。结果研究组手术时间、术中出血量、切口长度、下床活动时长、住院时间以及骨折愈合时间均短于对照组,差异有统计学意义(P均<0.05)。研究组的Harris髓关节功能评分优良率(96.67%)高于对照组(73.33%),差异有统计学意义(χ^(2)=7.862,P<0.05)。术后,研究组的疼痛评分低于对照组,差异有统计学意义(P<0.05);研究组的并发症发生率低于对照组,差异有统计学意义(P<0.05)。结论在治疗股骨粗隆间骨折的过程中,PFNA的内部固定手术展现出卓越的效果,能有效缩短手术所需的时间,减少出血量,改善髋关节活动度以及术后疼痛情况。展开更多
Measuring intrinsic hip external rotator strength (ER) without compensatory pelvic motion and activation of the sartorius is important for preventing or rehabilitating lower extremity injuries. However, the optimal me...Measuring intrinsic hip external rotator strength (ER) without compensatory pelvic motion and activation of the sartorius is important for preventing or rehabilitating lower extremity injuries. However, the optimal method for measuring intrinsic hip ER muscle strength while minimizing compensatory pelvic motions and activation of the sartorius is unclear. The purpose of this study is to compare measurements of hip ER strength, compensatory pelvic motion, and sartorius activation in the sitting, prone, and sidelying positions. Thirty-one healthy subjects (16 males and 15 females) were recruited for this study. Hip ER strength, pelvic kinematics, and sartorius muscle activation were measured during maximal isometric contraction of the hip ER in the sitting, prone, and sidelying positions. Hip ER strength was measured using a load-cell-type strength-measurement sensor. Pelvic kinematics was measured using an electromagnetic motion-tracking sensor. Electromyography was used to measure sartorius muscle activity. Data were analyzed using one-way repeated-measures analysis of variance. The result showed that hip ER strength and sartorius muscle activation were significantly lower in the sidelying compared with the sitting and prone positions (p < 0.01). Pelvic anteroposterior tilting was significantly greater in the sitting compared with the prone and sidelying positions (p < 0.01). Pelvic rotation differed significantly among positions (p < 0.01). Pelvic lateral tilting was significantly greater in the prone compared with the sitting position (p < 0.017). Compensatory pelvic motion and sartorius muscle activation were lower when hip ER strength measurements were made in the sidelying position. Therefore, the sidelying position is effective for measuring selective intrinsic hip ER strength.展开更多
Introduction: gait analysis of a subject with total hip replacement is described. Objective: instrumental gait analysis of a subject 12 years after the total hip arthroplasty. Materials and Methods: in a movement anal...Introduction: gait analysis of a subject with total hip replacement is described. Objective: instrumental gait analysis of a subject 12 years after the total hip arthroplasty. Materials and Methods: in a movement analysis laboratory, locomotion studies were carried out at freely chosen walking speed by a 64-year-old subject, obtaining kinematic, kinetic and surface electromyographic data in time and space. All measurements were assessments by applying walking protocols on a straight surface of 8 m long. Results: abnormal slight activations of semitendinosus and tibialis anterior muscles, of the left limb, were observed throughout the gait cycle, no spatiotemporal parameters far from normal values were detected. Conclusions: it was possible to obtain an exhaustive analysis of the parameters associated with the gait of a subject after 12 years of total hip arthroplasty.展开更多
文摘To study the influence of head-neck ratio and implant position on the range of motion (ROM) after total hip arthroplasty (THA).Methods In this study the author established a three-dimensional computerized model of hip joint and tested the range of motion of three different head-neck ratio after total hip arthroplasty.Results Range of motion after total hip arthroplasty depended on design parameters such as head-neck ratio,but also on the implantation parameters such as the cup’s inclination and antevertion,the stem’s antevertion and their combination of each other.Optimal range of motion required compliant position of total hip components.The range of motion increased with the enlarging of head-hnck ratio.Conclusion Higher head-neck ratio leads to optimal range of motion and decreased the prevalence of prosthetic impingement within compliant,well-defined combination of cup’s inclination,cup’s antevertion and stem’s antevertion depending on the intended ROM.Domestic magnesium-silicon jade total hip prosthesis has too low head-neck ratio to result in enough range of motion that fulfilled daily living after total hip arthroplasty.14 refs,4 figs,3 tabs.
文摘目的探讨股骨近端抗旋髓内钉(Proximal Femoral Nail Antirotation,PFNA)内固定术治疗股骨粗隆间骨折的疗效以及对患者的手术时间、出血量、术后疼痛和髋关节活动性的影响。方法简单随机选取2021年6月—2023年5月聊城市冠县人民医院诊治的60例股骨粗隆间骨折患者作为研究对象,采用随机数表法将患者划分为研究组(n=30)和对照组(n=30)。对照组采用行动力髋螺钉(Dynamic Hip Screw,DHS)内固定术进行治疗,研究组采用PFNA内固定术治疗。比较两组的手术相关指标、Harris髓关节功能评分优良率、疼痛评分及并发症发生率。结果研究组手术时间、术中出血量、切口长度、下床活动时长、住院时间以及骨折愈合时间均短于对照组,差异有统计学意义(P均<0.05)。研究组的Harris髓关节功能评分优良率(96.67%)高于对照组(73.33%),差异有统计学意义(χ^(2)=7.862,P<0.05)。术后,研究组的疼痛评分低于对照组,差异有统计学意义(P<0.05);研究组的并发症发生率低于对照组,差异有统计学意义(P<0.05)。结论在治疗股骨粗隆间骨折的过程中,PFNA的内部固定手术展现出卓越的效果,能有效缩短手术所需的时间,减少出血量,改善髋关节活动度以及术后疼痛情况。
文摘Measuring intrinsic hip external rotator strength (ER) without compensatory pelvic motion and activation of the sartorius is important for preventing or rehabilitating lower extremity injuries. However, the optimal method for measuring intrinsic hip ER muscle strength while minimizing compensatory pelvic motions and activation of the sartorius is unclear. The purpose of this study is to compare measurements of hip ER strength, compensatory pelvic motion, and sartorius activation in the sitting, prone, and sidelying positions. Thirty-one healthy subjects (16 males and 15 females) were recruited for this study. Hip ER strength, pelvic kinematics, and sartorius muscle activation were measured during maximal isometric contraction of the hip ER in the sitting, prone, and sidelying positions. Hip ER strength was measured using a load-cell-type strength-measurement sensor. Pelvic kinematics was measured using an electromagnetic motion-tracking sensor. Electromyography was used to measure sartorius muscle activity. Data were analyzed using one-way repeated-measures analysis of variance. The result showed that hip ER strength and sartorius muscle activation were significantly lower in the sidelying compared with the sitting and prone positions (p < 0.01). Pelvic anteroposterior tilting was significantly greater in the sitting compared with the prone and sidelying positions (p < 0.01). Pelvic rotation differed significantly among positions (p < 0.01). Pelvic lateral tilting was significantly greater in the prone compared with the sitting position (p < 0.017). Compensatory pelvic motion and sartorius muscle activation were lower when hip ER strength measurements were made in the sidelying position. Therefore, the sidelying position is effective for measuring selective intrinsic hip ER strength.
文摘Introduction: gait analysis of a subject with total hip replacement is described. Objective: instrumental gait analysis of a subject 12 years after the total hip arthroplasty. Materials and Methods: in a movement analysis laboratory, locomotion studies were carried out at freely chosen walking speed by a 64-year-old subject, obtaining kinematic, kinetic and surface electromyographic data in time and space. All measurements were assessments by applying walking protocols on a straight surface of 8 m long. Results: abnormal slight activations of semitendinosus and tibialis anterior muscles, of the left limb, were observed throughout the gait cycle, no spatiotemporal parameters far from normal values were detected. Conclusions: it was possible to obtain an exhaustive analysis of the parameters associated with the gait of a subject after 12 years of total hip arthroplasty.
