Computer navigated Hemi-pelvectomy for Ewings sarcoma surgical technique
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Malignant bone tumours account for only 4% to 6% of all cancers in children under 14 years of age. Although these tumours can arise anywhere in the skeleton, tumours arising from the pelvis are rare. The principle tumour types arising from the pelvis in those under 16 years of age are osteosarcoma and Ewing’s sarcoma, with the remainder constituting rare histologic subtypes. Ewing’s sarcoma is composed of primitive, undifferentiated, small round blue cells with large nuclei and scant cytoplasm that bears no resemblance to normal tissue. The characteristic translocation between chromosomes 11 and 22 results in a fusion gene, EWSR1-FL11, which is present in 90% of cases. Other translocations have been discovered, most frequently t(21:22).
Pre-operative chemotherapy frequently results in extensive tumour necrosis and shrinkage. Wide excision is often combined with radiotherapy to improve disease free survival. Definitive radiotherapy rather than surgical excision, although associated with worse overall survival, may be advocated if non-resectable or metastasis has occurred during chemotherapy, to spare the surgical morbidity.
Computer navigation surgery allows linking between the patient’s imaging information and anatomy through the use of tracking and registration of the preoperative and/or intraoperative acquired images. The use of computer navigation for tumour resections has found favour for resection of pelvic lesions. Navigation allows accurate pre operative planning of resections with accurate placement of planned osteotomies to allow adequate margins to be achieved without compromising vital structures.
Author: Mr Michael Parry FRCS (Tr & Orth)
Institution: The Royal Orthopaedic Hospital ,Birmingham ,UK.
- Each operation and the questions associated become named course in the CPD section
- The operative technique itself is read as a lesson as is any company implant information if this is being assessed.
- You’ll need to tick the box to confirm this has been done and can do this immediately if you have already read the op tech.
- The vast majority of operations have a 10-15 MCQ quiz covering all aspects of the decision making and the technique
- There are four possible answers of which one is correct (or on occasion more correct) than the others.
- There are additional quiz modules on the surgical steps, the implants and problem cases being added continually
- The course is completed once all the lessons are read and quizzes submitted and passed.
- On successful completion of each quiz you will receive a validated certificate in your CPD folder.
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- The timer suspends after 5 minutes though if there is no activity.
- When you restart you will resume at the same point in the module.
- Once you have completed each quiz you will need to feedback on the module first then click “submit” and your paper will be marked.
The pass mark is 75%.
- If you fall below this level you will be directed back to re-read the slides where you’ve tripped up.
- Once these have been read you can re-do just the questions you failed on.
- Once you have passed the quiz you can return at a future stage & resit .
Welcome to the Professional Development question section. The objective of taking these tests is to demonstrate that you have understood all aspects of the assessment and management of patients requiring surgical intevention. On successful completion you will receive a certificate accredited by both the Royal College of Surgeons of both England and Edinburgh as well as the British Orthopaedic Association.
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