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Intraoperative pedicle screw depth adjustment after initial insertion, including both forward and backward adjustments, is sometimes necessary to facilitate rod application and ensure that the screw is in the correct position, which is determined by intraoperative fluoroscopy. Adjusting the screw with forward turns has no negative influence on the screw fixation stability; however, screw turnback may weaken the fixation stability. The aim of this study is to evaluate the biomechanical properties of screw turnback and demonstrate the reduction in the fixation stability after the screw is turned 360° from its full insertion position. Commercially available synthetic closed-cell polyurethane foams with three different densities simulating various degrees of bone density were utilized as substitutes for human bone. Two different screw shapes (cylindrical and conical) together with two different pilot hole profiles (cylindrical and conical) were tested. Following specimen preparation, screw pullout tests were conducted using a material test machine. The mean maximal pullout strength between full insertion and 360-degree turnback from full insertion in each setting was statistically analyzed. The mean maximal pullout strength after 360-degree turnback from full insertion was generally lower than that at full insertion. The reduced mean maximal pullout strength after turnback increased with decreasing bone density. Conical screws had significantly lower pullout strength after 360-degree turnback than cylindrical screws. The mean maximal pullout strength was reduced by up to approximately 27% after 360-degree turnback when using a conical screw in a low bone density specimen. Additionally, specimens treated with a conical pilot hole presented a less reduction in pullout strength after screw turnback as compared to those with a cylindrical pilot hole. The strength of our study was that we systematically investigated the effects of various bone densities and screw shapes on screw stability after turnback, which has rarely been reported in the literature. Our study suggests that pedicle screw turnback after full insertion should be reduced in spinal surgeries, particularly procedures that use conical screws in osteoporotic bone. Pedicle screw secured with a conical pilot hole might be beneficial for screw adjustment.

Substate nationalism is often studied as a question of political identity and cultural recognition. The same applies to the study of multinational federalism - it is mainly conceived as a tool for the accommodation of minority cultures and identities. Few works in political philosophy and political science pay attention to the fiscal and redistributive dimensions of substate nationalism and multinational federalism. Yet nationalist movements in Western countries make crucial claims about fiscal autonomy and the fair distribution of resources between national groups within the same state. In recent years, Scottish nationalists have demanded greater tax autonomy, Catalan and Flemish nationalists have viewed themselves as unfairly disadvantaged by centralized fiscal arrangements, and equalization payments and social transfers in Canada have exacerbated tensions within the federation. In Fiscal Federalism in Multinational States contributors from political philosophy and political science disciplines explore the fiscal side of substate nationalism in Canada, Belgium, the United Kingdom, Spain, and Australia. Chapters examine the connection between secessionist claims and interregional redistributive arrangements, power relations in federations where taxing and spending responsibilities are shared between orders of government, the relationship between substate nationalism and fiscal autonomy, and the role of federal governments in redistributing resources among substate national groups. Fiscal Federalism in Multinational States brings together scholars of nationalism and federalism in a groundbreaking analysis of the connections between nationalist claims and fiscal debates within plurinational states.

This book is the first and only comprehensive examination of current and future legal principles designed to govern oil and gas activity in Iraq. This study provides a thorough-going review of every conceivable angle on Iraqi oil and gas law, from relevant provisions of the Iraqi Constitution of 2005; to legislative measures comprising the oil and gas framework law, the revenue sharing law, and the laws to reconstitute the Iraq National Oil Company and reorganize the Ministry of Oil; to the Kurdistan Regional Government's 2007 Oil and Gas Law No. (22) and its accompanying Model Production Sharing Contract; and to the apposite rules of international law distilled from both controlling UN resolutions addressing Iraq and more generally applicable principles of international law. This text is essential to the reading collection of every practitioner, business executive, government official, academic, public policy maven, and individual citizen with an interest in the details and controversial aspects of Iraqi energy law.

Minorities of the oil-producing states are seriously disturbed by the inequity that is apparent from the existing principles of revenue allocation in Nigeria.In taking issues with them and other southern advocates of new revenue allocation criteria, the dominant north's organic intellectuals have always relied on the obvious concentration of.

The design of intergovernmental fiscal transfers has a strong bearing on efficiency and equity of public service provision and accountable local governance. This book provides a comprehensive one-stop window/source of materials to guide practitioners and scholars on design and worldwide practices in intergovernmental fiscal transfers and their implications for efficiency, and equity in public services provision as well as accountable governance.

Debate on the question of who should receive the surplus revenue generated by natural-resource exploitation -- Ottawa or the provinces -- is usually carried on in terms of history, politics custom, law, social values, and environmental considerations. This collection of essays presents analyses of the question from the economist’s point of view. The essays fall into three groups. In the first of these, the authors examine the taxation of the mining and energy industries and show how the method of taxation chosen by different levels of government -- federal or provincial -- may be “non-neutral,” distorting private output and timing decisions. The second group consists of careful case studies of the effects of particular natural resource taxation measures; the third focuses directly on the question of provincial and federal entitlement to resource revenues. Although arguments are advanced for linking the right to tax to the responsibility for management and control (at present vested in the provinces), most of the contributors would agree that the provinces should be regarded as stewards and bailiffs, not landlords; as rent collectors and managers, not “rentiers” and owners.

Sue Turnback, 68, said a woman calling herself Carrinne Campbell called her Jan. 4, police said. Campbell said Turnback won $2.2 million in the Jamaican lottery but had to mail $1,000 to Jamaica to process the winnings. Turnback sent the money in an international money order the same day.

Turnback the Alarm, who is trained by Red Terrill and races for Valley View Farm, has two victories in four starts this year. Her career record is four victories, five seconds and two thirds in 13 starts. She was third in the Acorn, the first race of the Triple Tiara, run at a mile on May 25.