European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
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Neck sprain is a general term denoting a soft tissue injury of the neck, which seldom causes major disability but is considered a modern epidemic. The purpose of the present study was to determine the prevalence of sprain of the neck injury due to motor vehicle accidents (MVAs) in both drivers and passengers. In addition, the degree of seat belt wearing in both driver and passenger was analysed. ⋯ The results of this population-based study revealed a sharp increase in neck sprain from 1989 through 1995, whereas a more or less stable pattern was found for seat belt use. The sharp increase was found to be attributable to outpatients. Finally, we found a driver predominance as well as a female predominance; groups at risk were the 20- to 24-year-olds for drivers and 15- to 19-year-olds for passengers.
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Screw augmentation with calcium apatite cement (CAC) was used in seven patients with a progressive osteoporotic spinal deformity. Thirty-nine spinal segments (64 screws) were augmented: 15 anteriorly (three patients) and 24 posteriorly (five patients). Dorsally, hemilaminectomy was performed at the level of all augmented screws to rule out CAC leakage. ⋯ Pedicle wall damage was present at two levels, while at two other levels no wall damage was found during visualization. No CAC-related complications were observed perioperatively. No implant migration was observed, and fusion was observed in all cases at follow-up examination performed at a mean of 32 months after surgery.
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Loosening of the screws is a problem in instrumentation with pedicle screws. Coating with hydroxyapatite improves the holding characteristics for metal implants, but the possible effects on the anchorage of pedicle screws have not been described. In this study, seven patients were operated on with spinal instrumentation using four stainless steel pedicle screws. ⋯ Hydroxyapatite coating was shown to have improved the purchase of pedicle screws very effectively. By using fully coated screws, as in the present study, extraction was extremely difficult compared to extraction of conventional stainless steel screws, which were regularly loose. By reducing the area of the screws that is coated, it may be possible to achieve an enhanced purchase while extraction will be easier when compared to fully coated screws.
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A high rate of pseudarthrosis and a high overall rate of implant migration requiring surgical revision has been reported following posterior lumbar interbody fusion using BAK threaded cages. The high rate of both pseudarthrosis and implant migration may be due to poor fixation of the implant. The purpose of this study was to analyse the motion of threaded cages in posterior lumbar interbody fusion. ⋯ Motion of the implants was not seen in compression. In torsion, a rolling motion was noted, with a range of motion of 10.6 degrees around the central axis of the implant when left/right torsion (25 Nm) was applied. The way the implants move within the segment may be due to their special shape: the thread of the implants can not prevent the BAK cages rolling within the disc space.
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Chronic low back pain (CHLBP) occupies first place among factors restricting people's life activity under the age of 45. Frequency of CHLBP occurrence oscillates between 60 and 80%. Dysfunction of the erector trunci is a fundamental cause of CHLBP. ⋯ At the L4 level, mean amplitude, mean density, background amplitude, background density and upper amplitude were significantly higher in control group. The findings of this study show that (1) dysfunction of the erector spinae plays a significant role in CHLBP, and (2) this process applies to small and large motor units, but the character of these changes is different in particular muscles. Surface EMG is an objective, non-invasive method of examining function of the erector spinae in the author's opinion.