Objective To investigate the treatment method of osteoporotic refracture after vertebroplasty.Methods One hundred and twenty patients (140 vertebraes) with osteoporotic fractures from January 2010 to January 2011 were selected,12 months after operation,15 cases of refracture (20vertebraes) patients as the research object,11 cases were given bone cement to strengthen treatment,postoperative anti-infection,recovery given a positive rehabilitation exercise instruction ;4 cases were given anti-osteoporosis treatment.Follow-up of 10 months,whether leakage of bone cement and the recovery of anti-osteoporosis treatment were observed.Results Eleven patients with refracture in the process of bone cement injection had no prevertebral venous leakage and disc leakage,none of the patients had bone cement leakage after operation;including 3 cases occurred back pain after injection,the main consideration was surgery influenced the local nerve functions and given analgesic treatment,then pain significantly reduced; 4cases with anti-osteoporosis therapy and recoverd better,no pain and other unsuitable symptom occurred.Postoperative 3 d all of the patients could get out of bed,were discharged on 1 week after operation.All patients were not appear the adverse host reaction of fillers,with no occurrence of refracture.Through visual analog pain scale(VAS) score,VAS score in the 3 d after treatment and end-stage follow-up were significantly lower than before treatment [(3.05 ± 0.55),(0.05 ± 0.15) scores vs.(6.95 ± 0.65) scores],and VAS score at the time of end-stage follow-up was lower than 3 d after treatment,there was significant difference (P ＜0.05).Conclusion Bone cement to strengthen with anti-infection and rehabilitation exercise instruction and anti-osteoporosis in the treatment of osteoporotic refracture after vertebroplasty curative effect,safe and reliable effect,worthy of clinical popularization and application.

Objective To discuss the degenerative factors, the spinal segment distribution, and the mechanism in hyperextension injury of cervical spine. Method Eighty-nine patients with hyperextension injury of cervical spine were retrospectively analyzed by observing the degenerativelesion, the spinal cord segment with high signal in T2WI, and the location of facial trauma. Results Fifty-eight cases showed the disc hemiation which was the most common lesion, followed by 8 cases showing the calcification of the posterior longitudinal ligament. Besides, 7 cases presented the developmental stenosis of spinal canal, and also, 6 cases showed disc hemiation combined with the yellow ligament hypertrophy. The intervertebral level of the spinal cord with high signal in T2WI were distributed as follows:4 cases were at C2/3, of which onesuffered the forehead trauma; 12 cases were at C3/ 4, of which 10 had the forehead trauma, and one had the zygomatic trauma; 12 cases were at C4/5, of which 5 had the forehead trauma, one had both the zygomatic and the forehead trauma, and one had both the forehead and with the lower jaw trauma; 11 cases were at CS/6,of which 3 had the forehead trauma, 3 had the zygomatic trauma, and 2 had the lower jaw trauma. The location of the spinal cord with single high signal in T2WI did not correspond with the intervertebral disc level in 4 cases. For 10 cases the high signal in T2WI was found at two discontinuous segments. For 2 cases the 1 high signal in T2WI was found at over two segments. For 6 cases the high signal in T2WI was found at over three segments. Conclusions Disc hemiation is the most common underlyding factor in cervical hyperextension injury. The spinal level with high signal in T2WI was correlative to the impacted facial site. The shear force at the inflection point with or without the anterior-posterior compression force accounted for the cervical hyperextension injury.