Hereditary multiple exostoses(HME)is an autosomal dominant bone disorder characterized by abnormal bone development.HME mostly involves the forearm,resulting in forearm deformities,limited functional activities,etc.Cu...Hereditary multiple exostoses(HME)is an autosomal dominant bone disorder characterized by abnormal bone development.HME mostly involves the forearm,resulting in forearm deformities,limited functional activities,etc.Currently,there are multiple surgical methods including tumor resection with or without ulnar osteotomy and lengthening,simple radial head resection and distal radial hemiepiphysiodesis,but the optimal treatment remains controversial.Ulnar lengthening serves as an effective surgical intervention for forearm deformities in HME patients.This review examines its surgical techniques,complications,and timing of the operation to guide clinical decision-making for improving function and cosmetic outcomes.展开更多
A 21-year-old woman presented with a left-hand deformity that had been present since birth.She had no clear family or genetic history.Physical examination revealed absence of the left metacarpal phalanges and four sof...A 21-year-old woman presented with a left-hand deformity that had been present since birth.She had no clear family or genetic history.Physical examination revealed absence of the left metacarpal phalanges and four soft tissue bulges at the distal end of the wrist(Figure 1a).Digital radiography showed fusion of the lunate and triangular bones of the left wrist,fusion of the scaphoid with the distal row of carpal bones,and an irregular bone with an uneven distal margin.展开更多
The dynamic fracture behavior of the three-point bending beam with double deformity inclusions under impact loading is studied by using digital high-speed photography in combination with the transmission-type dynamic ...The dynamic fracture behavior of the three-point bending beam with double deformity inclusions under impact loading is studied by using digital high-speed photography in combination with the transmission-type dynamic caustic method. The experimental results indicate that the fluctuation of crack propagation velocity v first increases and then decreases in the crack propagation process. During the process of crack propagating into the inclusion area, the fracture resistance effect of the circular inclusion is the most significant and the effects of triangular and square inclusions are less obvious. The stress intensity factor near the crack tip increases during the propagation process and reaches its maximum value when the crack tip is close to the inclusions. The crack tip’s dynamic stress intensity factor （ DSIF） decreases when the crack exceeds the middle area of the double inclusions. These results provide an experimental basis and scientific foundation to strengthen the evaluation and fracture analysis of the structure containing deformity inclusions.展开更多
The approach combining the dynamic caustics method with high-speed photography technology is used to study the interaction between propagating cracks and three kinds of deformity inclusions（ cylinder inclusion, quadr...The approach combining the dynamic caustics method with high-speed photography technology is used to study the interaction between propagating cracks and three kinds of deformity inclusions（ cylinder inclusion, quadruple inclusion and triangular inclusion） under lowvelocity impact loading. By recording the caustic spots of crack tips at different moments during the crack propagation, the variation regulations of dynamic stress intensity factors（ DSIF） and crack growth velocity with respect to time are obtained. The experimental results showthat the resistance effects to crack growth are varied with different shapes of inclusions in specimens, and the quadruple inclusion＇s effect is more apparent. The distortion degree of caustic spots is affected by the shapes of inclusions as well, and the situation is more serious for cylinder and quadruple inclusions. The overall values of DSIFs of triangular inclusion specimen are greater than the others, and the crack growth velocities, characteristic sizes and DSIFs showprocesses of fluctuations because of the disturbance of reflection waves in specimens. The results provide an experimental basis for the analysis of strength and impact-resistance ability in structures with deformity inclusions.展开更多
文摘Hereditary multiple exostoses(HME)is an autosomal dominant bone disorder characterized by abnormal bone development.HME mostly involves the forearm,resulting in forearm deformities,limited functional activities,etc.Currently,there are multiple surgical methods including tumor resection with or without ulnar osteotomy and lengthening,simple radial head resection and distal radial hemiepiphysiodesis,but the optimal treatment remains controversial.Ulnar lengthening serves as an effective surgical intervention for forearm deformities in HME patients.This review examines its surgical techniques,complications,and timing of the operation to guide clinical decision-making for improving function and cosmetic outcomes.
文摘A 21-year-old woman presented with a left-hand deformity that had been present since birth.She had no clear family or genetic history.Physical examination revealed absence of the left metacarpal phalanges and four soft tissue bulges at the distal end of the wrist(Figure 1a).Digital radiography showed fusion of the lunate and triangular bones of the left wrist,fusion of the scaphoid with the distal row of carpal bones,and an irregular bone with an uneven distal margin.
基金The National Basic Research Program of China(973 Program)(No.2011CB606105)the National Natural Science Foundation of China(No.51374210,51134025)
文摘The dynamic fracture behavior of the three-point bending beam with double deformity inclusions under impact loading is studied by using digital high-speed photography in combination with the transmission-type dynamic caustic method. The experimental results indicate that the fluctuation of crack propagation velocity v first increases and then decreases in the crack propagation process. During the process of crack propagating into the inclusion area, the fracture resistance effect of the circular inclusion is the most significant and the effects of triangular and square inclusions are less obvious. The stress intensity factor near the crack tip increases during the propagation process and reaches its maximum value when the crack tip is close to the inclusions. The crack tip’s dynamic stress intensity factor （ DSIF） decreases when the crack exceeds the middle area of the double inclusions. These results provide an experimental basis and scientific foundation to strengthen the evaluation and fracture analysis of the structure containing deformity inclusions.
基金The National Natural Science Foundation of China(No.51374210,51134025)the 111 Project(No.B14006)
文摘The approach combining the dynamic caustics method with high-speed photography technology is used to study the interaction between propagating cracks and three kinds of deformity inclusions（ cylinder inclusion, quadruple inclusion and triangular inclusion） under lowvelocity impact loading. By recording the caustic spots of crack tips at different moments during the crack propagation, the variation regulations of dynamic stress intensity factors（ DSIF） and crack growth velocity with respect to time are obtained. The experimental results showthat the resistance effects to crack growth are varied with different shapes of inclusions in specimens, and the quadruple inclusion＇s effect is more apparent. The distortion degree of caustic spots is affected by the shapes of inclusions as well, and the situation is more serious for cylinder and quadruple inclusions. The overall values of DSIFs of triangular inclusion specimen are greater than the others, and the crack growth velocities, characteristic sizes and DSIFs showprocesses of fluctuations because of the disturbance of reflection waves in specimens. The results provide an experimental basis for the analysis of strength and impact-resistance ability in structures with deformity inclusions.
