We analyzed the stress state of Harrington rod with Edwards sleeve (HRS) and Harrington rod of C type (HRC), and determined its dangerous cross section and dangerous point. Through theoretical analysis and photoelastic model testing to confirm:In the case of the same reduction degree of injured spine, the rack root stress of HRC is remarkably less than that of HRS. It is prompting clinic:To cure compression fractures of spine with HRS, broken situation can be reduced at the rack root of Harrington rod. Succ...
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