The purpose of this study was to compare the biomechanical stability obtained by using our technique featured an anatomical plate and compression bolts versus that of the conventional anatomic plate and cancellous scr...The purpose of this study was to compare the biomechanical stability obtained by using our technique featured an anatomical plate and compression bolts versus that of the conventional anatomic plate and cancellous screws in the fixation of intraarticular calcaneal fractures.Eighteen fresh frozen lower limbs of cadavers were used to create a reproductive Sanders type-Ⅲ calcaneal fracture model by using osteotomy.The calcaneus fractures were randomly selected to be fixed either using our anatomical plate and compression bolts or conventional anatomic plate and cancellous screws.Reduction of fracture was evaluated through X radiographs.Each calcaneus was successively loaded at a frequency of 1 Hz for 1000 cycles through the talus using an increasing axial force 20 N to 200 N and 20 N to 700 N,representing the partial weight bearing and full weight bearing,respectively,and then the specimens were loaded to failure.Data extracted from the mechanical testing machine were recorded and used to test for difference in the results with the Wilcoxon signed rank test.No significant difference was found between our fixation technique and conventional technique in displacement during 20-200 N cyclic loading(P=0.06),while the anatomical plate and compression bolts showed a great lower irreversible deformation during 20-700 N cyclic loading(P=0.008).The load achieved at loss of fixation of the constructs for the two groups had significant difference:anatomic plate and compression bolts at 3839.6±152.4 N and anatomic plate and cancellous screws at 3087.3±58.9 N(P=0.008).There was no significant difference between the ultimate displacements.Our technique featured anatomical plate and compression bolts for calcaneus fracture fixation was demonstrated to provide biomechanical stability as good as or better than the conventional anatomic plate and cancellous screws under the axial loading.The study supports the mechanical viability of using our plate and compression bolts for the fixation of calcaneal fracture.展开更多
Objective： To compare the clinical efficacy of percutaneous kyphoplasty （PKP） with pedicle screw system （PS） in the treatment of vertebral compression fracture （VCF） . Methods： Eighty-six patients with VCF we...Objective： To compare the clinical efficacy of percutaneous kyphoplasty （PKP） with pedicle screw system （PS） in the treatment of vertebral compression fracture （VCF） . Methods： Eighty-six patients with VCF were treated either by PKP （ Group A, n ffi 30） ） or PS （ Group B, n ffi 56）. The anterior, intermediate, and posterior heights of the vertebrae body , visual analogue pain scale （VAS） before and after operation, the duration of operation, and amount of blood loss between two groups were compared. Results ： No statistical difference was noted regarding the vertebral height between two groups. Significant difference was seen in VAS, duration of operation and amount of blood loss between the two groups （P 〈0. 01 ）. Conclusions： Percutaneous kyphoplasty has the similar therapeutic efficacy with pedicle screw system in treatment of VCF with a mininlal invasion, less operation time and blood loss. For those with posterior wall destruction, PS is deemed favorable.展开更多
BACKGROUND Fibrous dysplasia associated with aneurysmal bone cyst(ABC)-like changes in the right proximal femur has a low incidence.It is considered more difficult to make early diagnosis than for single fibrous dyspl...BACKGROUND Fibrous dysplasia associated with aneurysmal bone cyst(ABC)-like changes in the right proximal femur has a low incidence.It is considered more difficult to make early diagnosis than for single fibrous dysplasia.CASE SUMMARY A 14-year-old woman was admitted because of persistent pain in the right hip and abnormal gait over the previous 2 mo.She had no history of present or past illness.Preoperative photography,enhanced computed tomography,and magnetic resonance imaging showed ground-glass appearance with cortical scalloping and expansion of the right proximal femur and femoral neck.Pathological examination by preoperative puncture biopsy revealed fibrous dysplasia of the right proximal femur.The patient was diagnosed with fibrous dysplasia based on medical history,physical examination,and results of laboratory,imaging and pathological examinations.According to final pathological examination,the patient was diagnosed with fibrous dysplasia of the right proximal femur associated with ABC.Curettage and allograft along with fixation of compression screws was performed for fibrous dysplasia associated with ABClike changes.No obvious allograft absorption,loosening of fixation,or secondary fracture were observed during 6-months’follow-up with re-examination by plain radiography and computed tomography.Fibrous dysplasia associated with ABClike changes in the right proximal femur has a low incidence and early diagnosis is considered more difficult than for single fibrous dysplasia.CONCLUSION We report a cases of fibrous dysplasia associated with ABC-like changes in the right proximal femur treated with curettage and allograft along with hip compression screws.展开更多
目的通过对L4椎体爆裂骨折模型以及应用不同方法固定后的生物力学测试，探讨Index—level螺钉短节段固定方法在治疗下腰椎爆裂骨折中的意义。方法选取10具新鲜尸体腰骶椎标本，通过截骨、切断部分韧带的方法制作L4椎体爆裂骨折模型，然...目的通过对L4椎体爆裂骨折模型以及应用不同方法固定后的生物力学测试，探讨Index—level螺钉短节段固定方法在治疗下腰椎爆裂骨折中的意义。方法选取10具新鲜尸体腰骶椎标本，通过截骨、切断部分韧带的方法制作L4椎体爆裂骨折模型，然后依序进行长节段固定、短节段固定以及短节段＋Index-level螺钉固定并进行生物力学测试，比较不同固定方法腰椎活动度（range of motion，ROM）的差异。结果与短节段固定比较，短节段＋Index—level螺钉固定在前屈、轴向旋转和侧屈时ROM降低，差异有统计学意义（P〈0．05）。在后伸位时短节段＋Index—level固定稳定性提高，ROM降低32．7％，但差异无统计学意义。结论Index—level螺钉短节段固定较单纯短节段内固定平均提高32．5％的即刻稳定性，而且比长节段固定保留更大范围ROM。展开更多
文摘The purpose of this study was to compare the biomechanical stability obtained by using our technique featured an anatomical plate and compression bolts versus that of the conventional anatomic plate and cancellous screws in the fixation of intraarticular calcaneal fractures.Eighteen fresh frozen lower limbs of cadavers were used to create a reproductive Sanders type-Ⅲ calcaneal fracture model by using osteotomy.The calcaneus fractures were randomly selected to be fixed either using our anatomical plate and compression bolts or conventional anatomic plate and cancellous screws.Reduction of fracture was evaluated through X radiographs.Each calcaneus was successively loaded at a frequency of 1 Hz for 1000 cycles through the talus using an increasing axial force 20 N to 200 N and 20 N to 700 N,representing the partial weight bearing and full weight bearing,respectively,and then the specimens were loaded to failure.Data extracted from the mechanical testing machine were recorded and used to test for difference in the results with the Wilcoxon signed rank test.No significant difference was found between our fixation technique and conventional technique in displacement during 20-200 N cyclic loading(P=0.06),while the anatomical plate and compression bolts showed a great lower irreversible deformation during 20-700 N cyclic loading(P=0.008).The load achieved at loss of fixation of the constructs for the two groups had significant difference:anatomic plate and compression bolts at 3839.6±152.4 N and anatomic plate and cancellous screws at 3087.3±58.9 N(P=0.008).There was no significant difference between the ultimate displacements.Our technique featured anatomical plate and compression bolts for calcaneus fracture fixation was demonstrated to provide biomechanical stability as good as or better than the conventional anatomic plate and cancellous screws under the axial loading.The study supports the mechanical viability of using our plate and compression bolts for the fixation of calcaneal fracture.
文摘Objective： To compare the clinical efficacy of percutaneous kyphoplasty （PKP） with pedicle screw system （PS） in the treatment of vertebral compression fracture （VCF） . Methods： Eighty-six patients with VCF were treated either by PKP （ Group A, n ffi 30） ） or PS （ Group B, n ffi 56）. The anterior, intermediate, and posterior heights of the vertebrae body , visual analogue pain scale （VAS） before and after operation, the duration of operation, and amount of blood loss between two groups were compared. Results ： No statistical difference was noted regarding the vertebral height between two groups. Significant difference was seen in VAS, duration of operation and amount of blood loss between the two groups （P 〈0. 01 ）. Conclusions： Percutaneous kyphoplasty has the similar therapeutic efficacy with pedicle screw system in treatment of VCF with a mininlal invasion, less operation time and blood loss. For those with posterior wall destruction, PS is deemed favorable.
基金The Scientific Program of the Health and Family Planning Commission of Hunan Province,China,No.C20190940The Science and Technology Planning Project of Huaihua,China,NO.2021R3117。
文摘BACKGROUND Fibrous dysplasia associated with aneurysmal bone cyst(ABC)-like changes in the right proximal femur has a low incidence.It is considered more difficult to make early diagnosis than for single fibrous dysplasia.CASE SUMMARY A 14-year-old woman was admitted because of persistent pain in the right hip and abnormal gait over the previous 2 mo.She had no history of present or past illness.Preoperative photography,enhanced computed tomography,and magnetic resonance imaging showed ground-glass appearance with cortical scalloping and expansion of the right proximal femur and femoral neck.Pathological examination by preoperative puncture biopsy revealed fibrous dysplasia of the right proximal femur.The patient was diagnosed with fibrous dysplasia based on medical history,physical examination,and results of laboratory,imaging and pathological examinations.According to final pathological examination,the patient was diagnosed with fibrous dysplasia of the right proximal femur associated with ABC.Curettage and allograft along with fixation of compression screws was performed for fibrous dysplasia associated with ABClike changes.No obvious allograft absorption,loosening of fixation,or secondary fracture were observed during 6-months’follow-up with re-examination by plain radiography and computed tomography.Fibrous dysplasia associated with ABClike changes in the right proximal femur has a low incidence and early diagnosis is considered more difficult than for single fibrous dysplasia.CONCLUSION We report a cases of fibrous dysplasia associated with ABC-like changes in the right proximal femur treated with curettage and allograft along with hip compression screws.
文摘目的通过对L4椎体爆裂骨折模型以及应用不同方法固定后的生物力学测试，探讨Index—level螺钉短节段固定方法在治疗下腰椎爆裂骨折中的意义。方法选取10具新鲜尸体腰骶椎标本，通过截骨、切断部分韧带的方法制作L4椎体爆裂骨折模型，然后依序进行长节段固定、短节段固定以及短节段＋Index-level螺钉固定并进行生物力学测试，比较不同固定方法腰椎活动度（range of motion，ROM）的差异。结果与短节段固定比较，短节段＋Index—level螺钉固定在前屈、轴向旋转和侧屈时ROM降低，差异有统计学意义（P〈0．05）。在后伸位时短节段＋Index—level固定稳定性提高，ROM降低32．7％，但差异无统计学意义。结论Index—level螺钉短节段固定较单纯短节段内固定平均提高32．5％的即刻稳定性，而且比长节段固定保留更大范围ROM。
