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Biomedical subjects

J F Camp

Publications and source records attributed to J F Camp.

9 recordsLinked to original sources
PubMed1991

Patient-controlled analgesia.

It has become increasingly obvious that traditional narcotic dosage schemes are not optimally effective in relieving pain. Inadequate relief of pain results in increased patient morbidity, probably due to adverse effects on the neurologic, endocrine, pulmonary and cardiovascular systems. Insufficient pain relief also contributes to patient dissatisfaction. Patient-controlled analgesia allows a patient to balance analgesic levels with the degree of pain relief required. This analgesic technique is easy to use and is well accepted by patients, physicians and nurses. Significant benefits include earlier ambulation, decreased overall narcotic use, improved postoperative pulmonary function, shorter hospital stay and reduced health care costs.

Analgesia, Patient-Controlled↗
PubMed1990

Immediate complications of Cotrel-Dubousset instrumentation to the sacro-pelvis. A clinical and biomechanical study.

The authors reviewed the early complications in all patients fused to the sacro-pelvis using Cotrel-Dubousset instrumentation at the Texas Scottish Rite Hospital. Sixteen patients were studied with an average follow-up of 13 months. Three methods of sacro-pelvis fixation were evaluated: iliosacral screws, sacral screws, and a technique whereby the caudle ends of the Cotrel-Dubousset rods were fashioned and inserted into the posterior iliac crest using the Galveston technique. Seven of the 16 sets of sacral screws (44%) failed during and after surgery. Two of the 7 sets of iliosacral screws failed postoperatively (28%). No failures occurred in the 8 sets of Cotrel-Dubousset rods placed with the Galveston technique. Seven of the nine medical complications observed (77%) occurred in the sacral screw group. Using calf spines, a biomechanical evaluation of each system was undertaken to determine strength of fixation. Each system was failed in flexion 3 times. The sacral screws were the weakest, pulling directly out of the sacrum at 40 N-M. Cotrel-Dubousset rods inserted with the Galveston technique were the strongest, experiencing rod deformities before flexion failure at 70 N-M. Iliosacral screws were of intermediate strength failing by rotation on the axis of the screws or pulling directly out of the ilium at 55 N-M. The authors conclude that using Cotrel-Dubousset rods inserted with the Galveston techniques was the strongest and safest method of sacro-pelvis fixation of the three tested.

Adolescent↗
PubMed1986

Effects of postmortem storage by freezing on ligament tensile behavior.

The purpose of this study is to examine the effect of prolonged postmortem freezing storage (between 1 1/2 and 3 months at -20 degrees C) on the structural properties of the medial collateral ligament (MCL)-bone complex as well as the mechanical properties of the MCL substance from the rabbit knee. Tensile testing of the femur-MCL-tibia specimen was performed and no statistically significant changes were noted between the fresh and stored samples in terms of the cyclic stress relaxation, the load-deformation characteristics, as well as the load, deformation and energy absorbing capability at failure. The area of hysteresis of the stored samples was significantly reduced in the first few cycles, however. The mechanical properties of the MCL substance, as represented by the stress-strain curves, tensile strength and ultimate strain also did not change following storage. We conclude, therefore, proper and careful storage by freezing would have little or no effect on the biomechanical properties of the ligaments.

Animals↗
PubMed1986

Core decompression of the femoral head for osteonecrosis.

The results of forty core-decompression procedures that were performed for ischemic necrosis of the femoral head in thirty-one patients over a four-year period were retrospectively reviewed to ascertain the effectiveness of the procedure. The data did not support the published rates of success of the procedure for Stage-1 and Stage-2 lesions. With a mean length of follow-up of eighteen months, 60 per cent of the hips that had a decompression prior to collapse of the femoral head demonstrated progression of the lesion and were judged to be a failure by clinical or radiographic criteria. Computerized tomographic scans and magnetic resonance imaging proved to be 100 per cent sensitive for diagnosis in preoperative testing; isotopic bone-scanning was less sensitive (80 per cent). Functional intraoperative testing by the method of Ficat did not provide added sensitivity or specificity to the results of the preoperative bone scan. A postoperative or intraoperative fracture occurred in four hips, for an incidence that exceeded any in previously published reports. We concluded that core decompression should be considered a relatively ineffective procedure with significant morbidity.

Adult↗
PubMedDate not supplied

Halo application in the infant.

The technique for halo application in very young children is described, with case presentations of three children aged less than 2 years who underwent successful cervical fusion with halo immobilization. Our multiple pin technique for very small children diverges significantly from previously accepted recommendations. With multiple pins, significantly less torque is required to provide stability, allowing a greater range of pin placement sites in areas where the infant skull might otherwise be considered too thin. This technique of halo application provides a safe and effective method of cervical immobilization for infants.

Braces↗