Biomedical subjects

P M Crosby

Publications and source records attributed to P M Crosby.

2 recordsLinked to original sources

PubMed1989

Comparison of two-point discrimination testing devices.

In order to provide hand therapists and physicians with information regarding instruments for testing two-point discrimination we evaluated 20 noninjured and 18 nerve-injured patients using the three-prong Aesthesiometer, a paper clip, and a Disk-Criminator. Two-point discrimination was tested by means of a randomized order for the two different discrimination tests and the three different testing devices. The measurement for either moving or static two-point discrimination, when obtained with the three-prong Aesthesiometer, was consistently less sensitive than with the Disk-Criminator, and the correlation coefficient was the least between these two testing devices. The Disk-Criminator measurement had the smallest standard deviation among the three testing devices. In terms of desirability of the testing device tip geometry, translation of interprong distance to numerical rating scale, and facility of alternating between one- and two-prong testing techniques, the paper clip was judged to be the least favorable and the Disk-Criminator to be the most favorable test device.

Adult↗

PubMed1987

Reliability of two-point discrimination measurements.

Both moving and static two-point discrimination are valid measurements of functional sensibility in the hand. The present study investigated the interobserver variability of these measurements when two observers used the same testing instrument and the same definition of the testing procedure's end point. In testing 30 nerve-injured patients, interobserver variability was found to vary within 1 mm, or less, for moving two-point discrimination in 93.3% of the measurements and for static two-point discrimination in 86.8% of the measurements. In only two of the 30 measurements of moving two-point discrimination and in four of the measurements for static two-point discrimination were interobserver differences equal to 2 mm. Measurements for both moving and static two-point discrimination were analyzed statistically by linear regression and correlation co-efficient techniques. The measurements for two-point discrimination obtained with the protocol employed in this study were found to have an interobserver reliability at the p less than 0.00001 level.

Hand↗