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Material and Methods: We conducted this study in the thoracic extremity surgery module, from the Trauma and Orthopedic Surgery Hospital "Lomas Verdes" of the Instituto Mexicano del Seguro Social (IMSS) from September 2001 to 2004. Eighty-seven patients were included with ages between 16 to 81 years, with the diagnosis of humeral shaft fracture without previous neurologic lesion and were treated with intramedullary nail or dynamic compression plate (DCP) with a 2 year follow up., Results: Eighty seven patients were evaluated; mean age 42.2 +/- 3.2 years; male gender (61%) vs. female gender (39%) (p<0.05); more frequently affected extremity: left (59.7) vs. right (40.3%); acute period fracture: 59.7%; non union 25.3% and delay of consolidation: 15%. Implant used: DCP plate (80%) vs. intramedullary nailing (20%) (p<0.05%). Radial nerve lesion at the beginning and end of the study: 15 (22%) of 70 patients vs. 1 (5.5%) of 17 patients operated with DCP plate vs. intramedullary nail respectively. Of the 16 radial nerve lesions on total (100%), 12 presented with neuroapraxia (10.4%) that included a patient treated with intramedullary nailing and 4 (3.4%) axonotmesis treated with open reduction and internal fixation with DCP., Conclusion: The preference of treatment on our hospital is the use of DCP in humeral shaft fractures. The surgical technique with DCP represents a higher incidence of radial nerve lesion probably due to the exposure and proximity to the radial nerve during surgery. It will be necessary to verify these results in a clinical controlled trial.

In this paper we present a technique for fully automatic, real-time 3D SPECT (Single Photon Emitting Computed Tomography) and 2D ultrasound image registration. We use this technique in the context of kidney lesion diagnosis. Our registration algorithm allows a physician to perform an ultrasound exam after a SPECT image has been acquired and see in real time the registration of both modalities. An automatic segmentation algorithm has been implemented in order to display in 3D the positions of the acquired US images with respect to the organs.

Background: We undertook this study to evaluate the clinical and functional effect of hydrodissetion of the paratendon in the postoperative period of patients submitted to surgery of reconstruction of anterior cruciate ligament., Methods: A non-controlled clinical study was conducted at the Unidad de Alta Especialidad de Ortopedia y Traumatología "Magdalena de las Salinas," Instituto Mexicano del Seguro Social, Mexico City. Twenty two patients and 23 controls were included. Surgical intervention consisted of a bone-tendon-bone technique with hydrodissection and without hydrodissection of the paratendon., Results: The following results were obtained: functionality of the knee, pain, extension and flexion. Male: 20 vs. 22; female: 2 vs. 1 (p = 0.581), age: 29 +/- 4.6 years vs. 26 +/- 6.2 (0.946); weight: 68 +/- 8.8 vs. 72 +/- 6.2 (p = 0.190); height: 1.60 m +/- 4.8 vs. 1.62 m +/- 7.5 (p =0.909). Side: right: 5 vs. 5; left: 17 vs. 18 (p = 0.937). Evaluation scale of Knee Index: 84 +/- 4 vs. 70 +/- 8; pain: 10 days: 3.7 +/- 1.6 vs. 6.2 +/- 1.4, 4 weeks: 1.3 +/- 1.6 vs. 4.1 +/- 2.1 (p <0.001) flexion: 95 +/- 6.7 degrees vs. 86 +/- 6.1 degrees (p <0.001) group of hydrodissection vs. no hydrodissection, respectively., Conclusions: In the immediate postoperative period (4 weeks), pain is diminished and range of mobility increases as a result of the decrease of pain.