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Navigated versus conventional drilling of the knee in a model of obesity

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Beckmann J., Tingart M., Goetz J., Anders S., Grifka J., Kock F.
Open Medicine
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2008
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vol. 3
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issue 1
89-95
EN
Core decompression by exact drilling into ischemic lesions of the femoral condyle stays a challenging procedure, particularly in obese patients. The precision of fluoroscopically-based drilling compared to conventional drilling was evaluated in an in-vitro model for obesity. 40 sawbones were prepared mimicking osteonecrosis in obese patients. 20 sawbones were drilled by guidance of an intraoperative navigation system VectorVision® (BrainLAB, Munich, Germany); the other 20 sawbones were conventionally drilled by fluoroscopic control only. Regarding the distance to the desired mid-point of the lesion, a statistically significant difference with 0.55 mm in the navigated group and 1.19 mm in the control group could be stated (p<0.001). Significant differences were further found for the number of drilling corrections (p<0.001) and radiation time needed (p<0.001). Even in difficult circumstances as in obese patients, the drilling guided by the VectorVision®-navigation system shows high precision with simultaneous enormous reduction of radiation time.
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Pseudarthrosis in fibrous dysplasia treated with bone morphogenetic protein

100%
Beckmann J., Kock F., Tingart M., Goetz J., Grifka J., Schaumburger J.
Open Medicine
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2008
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vol. 3
|
issue 3
377-379
EN
We present a case of pseudarthrosis in a patient suffering from polyostotic fibrous dysplasia of the right part of the body that was successfully treated with bone morphogenetic protein. Pseudarthrosis occurred after proximal femoral shaft fracture due to a motorcycle accident initially treated by intramedullary nailing. After revision, the patient was treated by pseudarthrosis debridement and grafting of bone morphogenetic protein-7/osteogenic protein-1, resulting in callus formation that allowed indolent full weight-bearing after 6 weeks. The underlying disease as well as the described treatment is discussed.
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