Douglas R. Knapp

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The selection of fusion levels in thoracic idiopathic scoliosis was subjected to multicenter retrospective review to test the validity of the classification system and recommendations of King et al. The 253 patients reviewed were treated by posterior fusion and Harrington instrumentation. Bending films were of little help in selecting fusion levels.(More)
Fifty consecutive patients had posterior spinal fusion using only graft from bone banks. They were studied retrospectively in order to determine the pseudarthrosis rate, the quality of fusion mass obtained, the rate of infection, volume of blood lost, and operative time. The results showed that it is likely that the graft material used is not as important(More)
This retrospective study reviews 12 distal femoral osteotomies in nine patients performed for angular and rotational deformities, using the Orthofix external fixator. All osteotomies progressed to solid union with reliable correction of the deformity. Few complications were encountered. Simultaneous lengthening was performed on one patient successfully.(More)
For all lower extremity problems in children with cerebral palsy, early attention to overactive spastic muscle groups can aid in preventing bony deformities under most situations. More severely involved children need more aggressive treatment, with early soft tissue procedures to attempt balance of muscle groups surrounding joints. Early aggressive(More)
In this work we investigated the suitability of Hadoop MapReduce and Apache Spark for largescale computation of seismic waveform quality metrics by comparing their performance with that of a traditional distributed implementation. The Incorporated Research Institutions for Seismology (IRIS) Data Management Center (DMC) provided 43 terabytes of broadband(More)
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