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The Endo-button periosteal cortical femoral ﬁxation of hamstring grafts cheap zofran 8 mg amex symptoms lymphoma. Considerations 61 Disadvantages The disadvantages are as follows: Fixation site is distant with increase in laxity buy zofran 8mg lowest price medicine 834, with the bungee cord effect. Tibial Fixation The tibial ﬁxation remains a problem with soft tissue graft ﬁxation. Patients generally do not tolerate metal devices in the subcutaneous area on the front of the tibia. The interference screw gets away from that problem, but has poor performance in cyclic load. The Intraﬁx (Mitek) device uses the interference screw ﬁxation principle, but increases both the ultimate load to failure and the cyclic load performance (Table 5. Considerations The most important consideration in ACL reconstruction is that the tunnels are put in the correct position. After this, the ﬁxation of the graft is the next most important factor in a satisfactory clinical outcome. Single staple 100N Double staple 500N Screw post 600N Button 400N RCI 300N BioScrew 400N BioScrew and button 600N Intraﬁx 700N Screw and washer 800N Washer Loc 900N 62 5. Graft Selection sions, physicians may need to have available another type of ﬁxation to deal with hardware and tunnel expansion. Tendon-to-Bone Healing Studies have shown that it takes at least 8 to 12 weeks for soft tissue to heal to bone, as compared to 6 weeks for bone-to-bone healing with the patellar tendon graft. Recent studies have shown that the compression of the tendon in the tunnel with a screw speeds the time of healing, similar to internal compression in bone healing. Donor Site Morbidity In 1982, Lipscomb found that after harvest of the semitendinosus only the strength of the hamstrings was 102% and after harvest of both the strength was 98%. Recently, it has been shown that the internal rota- tion strength is decreased after the harvest of the semitendinosus. The patellofemoral pain incidence has been reported by Aligetti to be 3 to 21% after semitendinosus reconstruction. Early Rehabilitation Prospective randomized studies by Aligetti and Marder have shown that with early and aggressive rehabilitation, there was no difference between the semitendinosus and patellar tendon grafts in stability or ﬁnal knee rating. This puts to rest the argument as to whether the hamstring graft can withstand early aggressive rehabilita- tion protocols. Central Quadriceps Tendon This graft has been largely ignored in North America over the past decade. An assistant can harvest the graft while the surgeon is doing the notchplasty. The tendon graft is ﬁxed with interference screws for the bone plug and sutures tied over buttons for the tendon end. A bioabsorbable interference screw may be used at the internal aperture of the tunnel to reduce the tendon motion in the tunnel. The quadriceps tendon graft should reduce the need for the allograft or synthetic in revision cases. With no harvest required, the time of the operative procedure is reduced. Disadvantages The main objection to the use of the allograft is the risk of disease transmission. Jackson has shown that it takes longer for the graft to incorporate and mature, meaning a longer time until the patient can return to sports. In the 1997 survey of the ACL study group by Campell, none of the members used allografts for primary reconstructions. Synthetic Grafts The best scenario for the use of the LARS synthetic graft is when the graft can be buried in soft tissue, such as in extra-articular reconstruc- tion. This allows for collagen ingrowth and ensures the long-term via- bility of the synthetic graft. It will be sure to fail early if it is laid into a joint bare, especially going around tunnel edges, and is unprotected by soft tissue. Advantages There is no harvest site morbidity with the use of the synthetic graft. Disadvantages The main disadvantage is that all the long-term studies have shown high failure rate. There is the potential for reaction to the graft material with synovitis, as seen with the use of the Gore-Tex graft.
This is a document which sets out your ideas in an easily accessible way buy zofran 8mg visa treatment 001. Even if you have not been asked speciﬁcally to produce a research proposal by your boss or tutor cheap 8mg zofran free shipping medicine hat mall, it is a good idea to do so, as it helps you to focus your ideas and provides a useful document for you to reference, should your research wander oﬀ track a little. Before you start work on your research proposal, ﬁnd out whether you’re required to produce the document in a speciﬁc format. For college and university students, you might be given a general outline and a guide as to how many pages to produce. For those of you who are produ- cingaproposaltosendtoafundingorganisationyou might have to produce something much more speciﬁc. Some provide advice and guidance about what they would like to see in your proposal. The larger funding bodies produce their proposal forms on-line so that they can be ﬁlled in and sent electronically, which makes the process a lot quicker and easier. This rationale should be placed within the con- text of existing research or within your own experience and/or observation. You need to demonstrate that you know what you’re talking about and that you have knowl- edge of the literature surrounding this topic. If you’re un- able to ﬁnd any other research which deals speciﬁcally with your proposed project, you need to say so, illustrat- ing how your proposed research will ﬁll this gap. If there is other work which has covered this area, you need to show how your work will build on and add to the existing knowledge. Basically, you have to convince people that you know what you’re talking about and that the research is important. Aims and objectives Many research proposal formats will ask for only one or two aims and may not require objectives. However, for some research these will need to be broken down in more depth to also include the objectives (see Example 6). The aim is the overall driving force of the research and the ob- jectives are the means by which you intend to achieve the aims. HOW TO PREPARE A RESEARCH PROPOSAL / 57 EXAMPLE 6: AIMS AND OBJECTIVES Aim To identify, describe and produce an analysis of the interact- ing factors which inﬂuence the learning choices of adult re- turners, and to develop associated theory. The nature, extent and eﬀect of psychological inﬂuences on choices, including a desire to achieve personal goals or meet individual needs. The nature, extent and eﬀect of sociological inﬂuences on choices, including background, personal and social expecta- tions, previous educational experience and social role. The nature and inﬂuence of individual perceptions of courses, institutions and subject, and how these relate to self-perception and concept of self. The inﬂuence on choice of a number of variables such as age, gender, ethnicity and social class. The role and possible inﬂuence of signiﬁcant others on choice, such as advice and guidance workers, peers, relatives and employers. The nature and extent of possible inﬂuences on choice of available provision, institutional advertising and marketing. The nature and extent of possible inﬂuences on choice of mode of study, teaching methods and type of course. How and to what extent inﬂuencing factors change as adults re-enter and progress through their chosen route. In this section you need to describe your proposed research methodology and methods and justify their use. This section needs to include details about samples, numbers of people to be contacted, method of data collection, methods of data analysis and ethical con- siderations. If you have chosen a less well known metho- dology, you may need to spend more time justifying your choice than you would need to if you had chosen a more traditional methodology. This section should be quite de- tailed – many funding organisations ﬁnd that the most common reason for proposal failure is the lack of metho- dological detail. T|me ta ble A detailed timetable scheduling all aspects of the research should be produced. This will include time taken to con- duct background research, questionnaire or interview schedule development, data collection, data analysis and report writing (see Table 5). Allow for this and add a few extra weeks on to each section of your timetable. If you ﬁnish earlier than you anticipated, that’s ﬁne as you have more time to spend on your report.
You now need to make sure that you are effective in selecting the pertinent information from these sources purchase 8mg zofran with visa symptoms 5dpiui. Start by taking a few minutes to get to know the material: For books find out: ° How is the book arranged? Get a general idea of the topics by skimming the headings order zofran 4mg with visa treatment zamrud, introductions and summaries. Read the author description to find out about his or her background and experience. Make your reading purposeful by thinking of questions that you would like the text to answer. This will help you select relevant information rather than making a précis of a whole chapter or article. Keep referring back to your questions so you only select the information you need to help answer your queries. Take time out to reflect on what you are reading and the information you have noted. Does it con 132 WRITING SKILLS IN PRACTICE firm or contradict your views? As well as reflecting on your reading, you also need to review your progress at regular intervals. Critically appraising the information It is important that you develop the skills to appraise the material you are reading. Make a note of any material that is fresh or additional to what you know already. Use the following checklist when appraising research papers: Literature review q Is the literature chosen for review relevant to the research question? Writing an introduction The reader, like the listener in a conversation, needs some opening state ments to introduce him or her to the forthcoming topic. The content of this introduction will vary between different types of written composition – so the introduction to an essay will differ from that of a research project. A good introduction will arouse the interest of the reader and make him or her want to read further. It is this element of an introductory para graph that is the most difficult to perfect. Devices such as quotes, exam ples, questions or controversial statements might be used to create an original and interesting start to a composition. In general: ° Avoid overwhelming the reader with too many themes in the introduction. Writing explanations Explanations are used to: ° give information ° clarify ° provide reasons. It is useful to start by phrasing your explanation as a what, how or why question: ° What is an erythrocyte? Identify the hidden variables or key points within the explanation (Brown 1978). In the above example, your explanation would include the relationship between the structure of the cell and its function and location in the body. Once you have identified the key elements, you can start to think about how you will organise the information. Start with the most important items and work your way through to the least important. Signal to the reader which points are major and therefore more significant. Use cue phrases like ‘it plays an essential role in…’ or ‘the fundamental point to remember…’. It is difficult to understand the detail until we have the whole picture, so start with broad areas and gradually narrow these down to specific points (Shimoda 1994). For example, in a description of erythrocytes, you might want to start with a few sentences about blood. The colourless fluid of the blood, known as plasma, car ries amongst other cells erythrocytes or red blood cells. Erythrocytes are…’ Using examples Use examples as part of your explanations to illustrate or help to clarify a point.
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