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ObjectiveVertebroplasty is an effective treatment for vertebral compression fracture, but may progress gradual vertebral height decrease in spite of vertebroplasty. Gradual vertebral height decrease also may induce aggravation of kyphotic change without severe pain. The purpose of this study was to evaluate risk factors for gradual vertebral height decrease in the absence of recurrent severe back pain.MethodsA retrospective analysis was performed on 44 patients who were diagnosed with a first osteoporotic compression fracture at a single level at the thoracolumbar junction. All patients were taken vertebroplasty. Possible risk factors for gradual vertebral height decrease, such as sex, age, bone mineral density, body mass index, level of compression fracture, volume of injected cement, cement leakage into disc space, and air clefts within fractured vertebrae, were analyzed.ResultsGradual vertebral height decrease of augmented vertebrae occurred commonly when more than 4 cc of injected cement was used, and when air clefts within fractured vertebrae were seen on admission. In addition, the sagittal Cobb angle more commonly increased during the follow-up period in such cases.ConclusionInjection of more than 4 cc of cement during vertebroplasty and air cleft within fractured vertebrae on admission induced gradual vertebral height decrease in augmented vertebrae. Thus, longer follow-up will be needed in such cases, even when patients do not complain of recurrent severe back pain.

PurposeAs multinational companies enter different countries, the extent of cultural unfamiliarity they face depends on their most recent entry. We examine this pattern of added cultural distance between a newly entered target country and the closest previous one and its effect on ownership decisions in each cross-border acquisition (CBA). We also examine the combined effect of added cultural distance and time between successive acquisitions on such decisions.Design/methodology/approachThe sample came from the Thomson Financial Securities Data Corporation (SDC) Platinum database, which spans different source and target countries for a 25-year period (1980–2014). We collected firm- (acquirer and target), industry-, country-, and transaction-level variables from SDC. After merging information from the different sources, the final sample comprised 10,423 CBA observations from 138 target countries.FindingsOur findings reveal that the ownership share decision is affected negatively by added cultural distance but positively by the time between two successive acquisitions. In addition, prior ownership and geographic distance moderate the relationship between added cultural distance and ownership in CBAs.Practical implicationsOur findings suggest that MNCs' managers who consider CBAs need to carefully examine closest previous target information and CBA experience, rather than focusing on direct cultural distance between the focal firm and target firm. Additionally, they should also consider the relevance of key contingency factors.Originality/valueWe disentangle the effects of added cultural distance on CBA ownership decisions and explore the boundary conditions of this relationship.

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