The known results on comparison of extended mean values are used to compare power means, Stolarsky means and Heron mean. Some proofs of well known results are simplified with several new results obtained.
Objective： Monteggia fracture disloca- tion equivalent, though already described by Bado, is still an unclassified entity. We aimed to retrospectively analyze 18 cases of Monteggia variants and discuss the injury mec...Objective： Monteggia fracture disloca- tion equivalent, though already described by Bado, is still an unclassified entity. We aimed to retrospectively analyze 18 cases of Monteggia variants and discuss the injury mechanisms, management, and outcome along with a re- view of the literature. Methods： A retrospective record of Monteggia frac- ture dislocation （2003-2008） was reviewed from medical record department of our institute. Classic Monteggia frac- ture dislocation, children below 12 years or adults over 50 years, as well as open grade iI ＆ Ill cases were excluded from this study. Monteggia variant inclusion criteria in- cluded fracture of the proximal ulna together with a fracture of the radial head or neck and skeletal maturity. Totally 26 patients were identified with Monteggia variants and 18 were available for follow-up, including 11 males and 7 fe- males with the mean age of 35 years. The ulna fracture was treated by compression plating along with tension band wiring. Radial head/neck was reconstructed in 12 patients while excised in 6 patients. Results： Follow-up ranged from 1-4 years, mean 2.6 years. Patients were assessed clinicoradiologically. MayoElbow Performance Score outcomes. At final follow-up, was employed to assess the the results were excellent in 10 patients, good in 4, fair in 2 and poor in 2. Mean range of motion of the elbow was 20°, 116°, 50° and 55° for extension, flexion, pronation and supination, respectively. Two patients had complications in the form of heterotopic ossification and stiffness of the elbow. One nonunion ulna, primarily treated by tension band wiring, was managed by refixation with locking reconstruction plate and bone grafting. Bone grafting was only required in this patient for nonunion. Another patient had implants removed on his request. The results in our series closely correlated with extent of intraarticular damage, coronoid fracture and comminuted fractures. Conclusions： Monteggia fracture dislocation equiva- lents are rare injuries and pre-surgery recognition by radio- graphs and 3-D CT helps make optimal plan. The poor results usually relate to intraarticular damage, coronoid fractures and comminution of the ulna and radial head fractures.展开更多
文摘The known results on comparison of extended mean values are used to compare power means, Stolarsky means and Heron mean. Some proofs of well known results are simplified with several new results obtained.
文摘Objective： Monteggia fracture disloca- tion equivalent, though already described by Bado, is still an unclassified entity. We aimed to retrospectively analyze 18 cases of Monteggia variants and discuss the injury mechanisms, management, and outcome along with a re- view of the literature. Methods： A retrospective record of Monteggia frac- ture dislocation （2003-2008） was reviewed from medical record department of our institute. Classic Monteggia frac- ture dislocation, children below 12 years or adults over 50 years, as well as open grade iI ＆ Ill cases were excluded from this study. Monteggia variant inclusion criteria in- cluded fracture of the proximal ulna together with a fracture of the radial head or neck and skeletal maturity. Totally 26 patients were identified with Monteggia variants and 18 were available for follow-up, including 11 males and 7 fe- males with the mean age of 35 years. The ulna fracture was treated by compression plating along with tension band wiring. Radial head/neck was reconstructed in 12 patients while excised in 6 patients. Results： Follow-up ranged from 1-4 years, mean 2.6 years. Patients were assessed clinicoradiologically. MayoElbow Performance Score outcomes. At final follow-up, was employed to assess the the results were excellent in 10 patients, good in 4, fair in 2 and poor in 2. Mean range of motion of the elbow was 20°, 116°, 50° and 55° for extension, flexion, pronation and supination, respectively. Two patients had complications in the form of heterotopic ossification and stiffness of the elbow. One nonunion ulna, primarily treated by tension band wiring, was managed by refixation with locking reconstruction plate and bone grafting. Bone grafting was only required in this patient for nonunion. Another patient had implants removed on his request. The results in our series closely correlated with extent of intraarticular damage, coronoid fracture and comminuted fractures. Conclusions： Monteggia fracture dislocation equiva- lents are rare injuries and pre-surgery recognition by radio- graphs and 3-D CT helps make optimal plan. The poor results usually relate to intraarticular damage, coronoid fractures and comminution of the ulna and radial head fractures.
