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AIM: It has been suggested that the use of a pilot-hole may reduce the risk of fracture to the lateral cortex. Therefore the purpose of this study was to determine the effect of a pilot hole on the strains and occurrence of fractures at the lateral cortex during the opening of a high tibial osteotomy (HTO) and post-surgery loading. MATERIALS AND METHODS: A total of 14 cadaveric tibias were randomized to either a pilot hole (n = 7) or a no-hole (n = 7) condition. Lateral cortex strains were measured while the osteotomy was opened 9 mm and secured in place with a locking plate. The tibias were then subjected to an initial 800 N load that increased by 200 N every 5000 cycles, until failure or a maximum load of 2500 N. RESULTS: There was no significant difference in the strains on the lateral cortex during HTO opening between the pilot hole and no-hole conditions. Similarly, the lateral cortex and fixation plate strains were not significantly different during cyclic loading between the two conditions. Using a pilot hole did not significantly decrease the strains experienced at the lateral cortex, nor did it reduce the risk of fracture. CONCLUSIONS: The nonsignificant differences found here most likely occurred because the pilot hole merely translated the stress concentration laterally to a parallel point on the surface of the hole.Cite this article: K. Bujnowski, A. Getgood, K. Leitch, J. Farr, C. Dunning, T. A. Burkhart. A pilot hole does not reduce the strains or risk of fracture to the lateral cortex during and following a medial opening wedge high tibial osteotomy in cadaveric specimens. Bone Joint Res 2018;7:166-172. DOI: 10.1302/2046-3758.72.BJR-2017-0337.R1.
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General and private psychiatric hospitals are becoming increasingly common as sites for involuntary hospitalization. Unlike the public facilities that these settings are supplanting, these hospitals must pay strict attention to issues associated with reimbursement, insurance status, and managed care. This article examines the effects of insurance status on length of stay for involuntarily hospitalized patients in general and private hospitals in Massachusetts. Using a two-stage sampling procedure, data on episodes of involuntary hospitalization were gathered and assessed using multiple regression. The primary effect was found between patients with Medicare, who had the longest stays, and individuals who were uninsured, who had the shortest. The data raise concerns that warrant closer scrutiny on the part of administrators and clinicians.