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Biomedical subjects

D Seligson

Publications and source records attributed to D Seligson.

159 records · Page 9Linked to original sources
PubMedDate not supplied

Medulloscopy for sepsis or nonunion: Early clinical experience with the tibia and femur.

We report the clinical use of "medulloscopy" for the visualization and irrigation of sepsis or nonunion of the tibia and femur in 7 cases. Included were 2 cases of aseptic femoral nonunion, 1 infected femoral nonunion with chronic osteomyelitis, 2 cases of healed tibia fracture with chronic osteomyelitis, 1 aseptic nonunion of the tibia, and 1 case of tibial osteomyelitis secondary to intravenous drug use. Visualization of the nonunion site or pathologic lesion was achieved in 86% of cases (6 of 7) and additional diagnostic information was obtained by medulloscopy in 86% of cases (6 of 7). A representative case is presented. Medulloscopy appears to be clinically useful for the treatment of sepsis or nonunion of the tibia and femur when access to the intramedullary canal is necessary.

Adult↗
PubMedDate not supplied

Fatigue properties of a twelve-hole versus a five-hole intramedullary supracondylar nail.

OBJECTIVES: To evaluate a design change intended to improve fatigue properties of Intramedullary Supracondylar nails (IMSC). DESIGN: Fatigue testing was performed on 12-hole and 5-hole IMSC nails in 18 plastic-fiber composite femurs. Fractures were simulated by a 1 cm wide osteotomy. Nails were cycled until failure with femoral loads ranging from 133 N to 1869 N (30 to 420 lb.) for the 12 mm nails and 133 N to 1335 N (30 to 300 lb.) for the 11 mm nails. A simple finite element computer model (FEM) was also created to determine the difference in stress distribution between the two designs. SETTING: All mechanical testing was performed using a servohydraulic test fram (MTS Systems, Minneapolis, MN). The FEM was performed using I-DEAS software (SDRC, Milford, OH) running on an Apollo 9000/735 workstation (Hewlett-Packard, Palo Alto, CA). INTERVENTION: The nails were locked proximal and distally. MAIN OUTCOME MEASUREMENT: The number of cycles to failure and the maximum tensile stress (FEM) was measured and compared between the two designs. RESULTS: The 11 mm and 12 mm 12-hole nails failed at an average of 53,514 cycles and 102,433 cycles respectively. No nail failures were seen in the 5-hole design. The FEM showed a 400% increase in maximum tensile stress due to the transverse screw hole in the cannulated nail. CONCLUSIONS: Elimination of screw holes at the level of a supracondylar metaphyseal defect significantly improves the fatigue life of the IMSC nail.

Biomechanical Phenomena↗
PubMedDate not supplied

Objective measurement of L4-5 instability. A case report.

Segmental instability as a consequence of disc degeneration is presented as an entity capable of producing low-back pain which responds to surgical stabilization with spinal fusion, and is illustrated with a case report. Data from lumbar radiographs were analyzed with a computer, and the position changes of the lumbar vertebrae were computed relative to the neutral positions of each. The results indicate that segmental instability is a complex disruption of intervertebral motion, consistent with the coupling behavior of the spine.

Adult↗
PubMedDate not supplied

Ankle instability: evaluation of the lateral ligaments.

Bilateral ankle stress testing was performed on 25 subjects in a device which controlled position of the foot and the amount of force applied during the examination. Both inversion testing in the anteroposterior plane and anterior drawer testing in the lateral plane were performed in the same group of symptom-free patients. The reproducibility of the test was demonstrated. Previous history of injury, left vs. right handedness, side and anthropometric measurements did not affect the test. There was no difference in the inversion test between ankles tested in neutral and plantar flexion. In functionally normal ankles, the range of inversion "talar tilt" was 0 to 18 degrees while the maximum of anterior displacement on drawer testing was 3 mm. The effective stiffness of the anterior talofibular ligament was thus computed as 65 +/- 34 N/m. Anterior drawer testing appears to evaluate lateral ligamentous integrity of the ankle more critically than the talar tilt test.

Adolescent↗
PubMedDate not supplied

Traumatic amputations. A vietnam experience.

Ninety-two acute combat amputations were performed in 70 casualities of the Vietnam conflict. In the 67 surviving patients with 83 stumps, primary closure was done in 24 limbs (30%) and delayed closure in 11 more. Closed cases were observed 2 weeks and no failures noted. In selected patients early suture of war amputations can be practiced with a satisfactory result.

Adolescent↗
PubMedDate not supplied

Negative experiences with pins-in-plaster for femoral fractures.

Six healthy young men sustaining femoral shaft fractures in traffic accidents were treated in pins-in-plaster. Complications included pintract infection (3/6), shortening, angulation (1), malrotation (2). Recasting and rehospitalization was frequent. These adverse experiences with this method of treatment of femoral shaft fractures should discourage its further use.

Accidents, Traffic↗
PubMedDate not supplied

Computerized tomographic assessment of the traumatized dorsolumbar spine before and after Harrington instrumentation.

Nine patients, treated with Harrington instrumentation for dorsolumbar fracture dislocations were studied pre- and postoperatively with computerized tomography (CT). In all 9 cases the preoperative CT scan showed the bony intrusion upon the spinal canal. Postoperative CT scans were of good quality despite minimal scatter artifact from the rods and demonstrated the integrity of the spinal canal and the reduction of the dislocation. CT scan is a useful tool for diagnosing the severity of dorsolumbar spine fractures and judging the results of the various forms of therapy.

Adolescent↗