No abstract

In this paper, we present three techniques for 6DOF natural feature tracking in real time on mobile phones. We achieve interactive frame rates of up to 30 Hz for natural feature tracking from textured planar targets on current generation phones. We use an approach based on heavily modified state-of-the-art feature descriptors, namely SIFT and Ferns plus a template-matching-based tracker. While SIFT is known to be a strong, but computationally expensive feature descriptor, Ferns classification is fast, but requires large amounts of memory. This renders both original designs unsuitable for mobile phones. We give detailed descriptions on how we modified both approaches to make them suitable for mobile phones. The template-based tracker further increases the performance and robustness of the SIFT- and Ferns-based approaches. We present evaluations on robustness and performance and discuss their appropriateness for Augmented Reality applications.

IV.

No abstract

The increasing prevalence of fragility fractures of the sacrum (FFS) occurring predominantly in osteoporotic individuals poses a diagnostic and therapeutic challenge. The clinical presentation varies from longstanding low back pain without the patient remembering a traumatic event to immobilized patients after suffering a low-energy trauma. FFS are often combined with a fracture of the anterior pelvic ring; hence they are classified as a part of fragility fractures of the pelvis (FFP). If not displaced, the patients are treated with weight bearing as tolerated and analgesics; however, we advocate to treat displaced fractures surgically according to the fracture personality and the patient’s comorbidities. Surgical options include minimal invasive sacro-iliac screws, trans-sacral bar osteosynthesis, open reduction and internal fixation, or spinopelvic stabilization. In the light of the high complication rate associated with immobilized patients, an operative approach often is indicated to accelerate the patient’s mobility.

No abstract

No abstract

➢ Fragility fractures of the pelvis exhibit different morphological characteristics and occur as a result of different mechanisms than high-energy pelvic ring lesions. The degree of instability may increase over time.➢ A new comprehensive classification system distinguishes between different degrees of instability and different locations of the fractures in the posterior pelvic ring.➢ The majority of fragility fractures of the pelvis have nondisplaced components in the posterior part of the pelvic ring. These types of fragility fractures are treated nonoperatively with pain therapy and mobilization as tolerated. A multidisciplinary approach is needed to ameliorate the general condition of the patient and to treat underlying metabolic abnormalities.➢ Because one of the primary goals of treatment is functional recovery, restoring stability is more important than restoring perfect anatomy.➢ Less-invasive stabilization techniques are preferable to open reduction and internal fixation for the treatment of posterior and anterior pelvic ring instabilities.