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Biomedical subjects

W G Stamp

Publications and source records attributed to W G Stamp.

At least 37 records · Page 2Linked to original sources
PubMed1980

The operative treatment of Achilles tendon injuries.

Twenty cases of Achilles tendon injury treated surgically at the University of Virginia Medical Center from 1970 to 1979 were reviewed and reevaluated with up to 9 years of follow-up. Three treatment groups were identified: Group I--primary repair of a lacerated Achilles tendon; Group II--primary repair of an acutely ruptured Achilles tendon; and Group III--subacute repair of Achilles tendon rupture (performed more than 72 hours after injury). Acute repairs were performed by end-to-end suture. In subacute cases the anastomosis was reinforced with one or 2 flaps from the gastrocnemius tendon. Strenuous exercise accounted for nearly all the cases of acute tendon rupture. Surgical complications and overall functional results were determined for each treatment group. Open repair provides excellent results when applied to lacerations. A good-to-excellent overall result can be expected for patients with acute ruptures and primary repair, but an awareness of the possible postoperative complications is necessary. Achilles tendon ruptures that go unrecognized for more than 72 hours are best treated conservatively.

Achilles Tendon↗
PubMed1978

The strength of metal reinforced methylmethacrylate fixation of pathologic fractures.

Fixation of the pathological fracture in terminal patients has in the past added the trauma of an extensive surgical procedure to an already weakened patient. Intramedullary fixation with single and double rods in conjuction with polymethylmethacrylate have been compared to ascertain the effect of different loading conditions using torque and analysis under compression measurements of the strength of repair bone. Extensive intramedullary reaming can be avoided with polymethylmethacrylate. The cement effectively transmits the load from the proximal to the distal fragment. The single large rod method would be more desirable for stiffer bones while the double thin rod technique may be applicable to more flexible bones.

Animals↗
PubMed1977

Nonunion of fractures of the proximal humerus: a method of treatment using a modified Moe plate.

Treatment of nonunion of fractures of the proximal or middle third of the humerus by use of a modified Moe plate is described. We have found this treatment to produce more favorable results than other methods using either internal or external immobilization. Simple modification of an existing mechanically sound device has led to a very useful instrument for the internal fixation of this type of fracture.

Aged↗
PubMedDate not supplied

Computerized analysis of isokinetic torque curves for muscle strengthening.

Isokinetic exercise measurements are widely used in rehabilitation medicine for evaluation and treatment planning. Computerized peak torque, work, and power measurements in isokinetic exercise can be obtained reliably when testing muscles that cross the knee and elbow joints. Important technical considerations in torque curve analysis are axis alignment, instrument calibration, and damp and gravity correction factors. The usefulness of these measurements has been limited by the small number of accurate scientific studies providing valid normative data on healthy individuals.

Biomechanical Phenomena↗
PubMedDate not supplied

Spinal evoked potentials from the cervical spine.

Spinal cord evoked potentials were recorded from spinous processes of the lumbar, thoracic, and cervical levels of the spinal column of normal cats in response to direct stimulation of the sciatic nerve and subcutaneous stimulation of the posterior tibial nerve. The typical primary response was altered by changes in location, magnitude, and frequency of the stimulation. Further changes in the primary response could be associated with spinal level of observation. Reduction in amplitude and decrease in signal complexity with increasing frequency of stimulus indicated the loss of the slower components of the primary response of average evoked potentials. Sharp reduction of signal amplitude and increase in latency was evident as the recording moved from L1 to C3 and C2.

Animals↗
PubMedDate not supplied

Semirigid rod fixation for long-bone fracture.

Experiments on 119 New Zealand rabbits were performed to measure healing strength of femurs. Four pairs of normal rabbit femurs were also studied in vitro by use of a four-point bending test to measure bending rigidity. Rabbit-sized octagonal cross-sectioned intramedullary rods with 12%, 20%, 50%, 75%, and 100% of femoral bending rigidity were specially prepared. For each animal, one intramedullary rod was implanted in an osteotomized femur through a standard lateral approach, with the other femur serving as a control. The results from the 12% rigidity rods were widely variable. In the 20% and 50% rigidity groups, the callus diameter was increased over the 75% rigidity group through all phases of healing. The torque ratio in this group increased up to eight weeks and then converged to the ratios of the other rigidities. The 75% rigidity group had shown increase of angular displacement up to eight weeks, while the 20% and 50% rigidity groups continued to improve and reached control strength at 12 weeks of treatment. Furthermore, the 20% and 50% groups absorbed more energy to failure in the later stage of healing than the 75% and 100% rigidity groups. Rods of 20% and 50% rigidity stimulate external callus formation and improve the stability of healing bone.

Animals↗
PubMedDate not supplied

The safety of cement fixation in the cervical spine. Studies of a rabbit model.

Immediate postoperative ambulation of patients with terminal neoplastic disease of the cervical spine can be permitted by vertebral stabilization with wire reinforced with polymethylmethacrylate. Precautions are necessary to avoid a temperature rise during cement polymerization and prevent vasular or nerve damage. Experiments on 20 rabbits and 2 human cadavers indicate that temperature at the cement-lamina interface can rise as high as 90 degrees while temperature under the intact lamina measures only 50 degrees. Precooling and insulation with Gelfoam may prevent heat injury to spinal cord.

Animals↗
PubMedDate not supplied

The treatment of fracture dislocations of the thoracolumbar spine with halofemoral traction and Harrington rod instrumentation.

Although function does not return after complete spinal cord injuries, partial recovery is possible after incomplete lesions Halofemoral traction may produce early decompression of injured neural elements in the spinal canal by anatomic realignment of the spinal column. It also acts to stabilize the very unstable thoracolumbar fracture dislocation and prevent displacement as well as further neurologic trauma. The body jacket is easy to make and apply. It allows early mobilization of patients when utilized in conjunction with the posterior spinal fusion and Harrington rod fixation.

Adolescent↗