Relation between clinical and instrumented measures of motor coordination in traumatically brain injured persons

Right and left upper extremity motor coordination was evaluated in 40 traumatically brain injured subjects using two different measurement techniques--a conventional clinical evaluation and an instrumented evaluation. The relationship between the results from the clinical evaluation (finger to nose test) and the instrumented evaluation (timed visual-arm coordinated lateral reach) was determined using canonical correlation analysis (Rc). Clinical and instrumented test scores were significantly correlated (Rc = .685, p = .002; Rc = .629, p = .008 for the right and left sides, respectively). The scores obtained by the clinical test had little variance; instrumented scores varied greatly among subjects. Significant differences did not exist between the right and left sides for the instrumented variables of average movement speed, accuracy, and index of coordination (paired t-tests, p = .550, p = .548, p = .627, respectively) or for the clinical variables of time of execution (paired t-test, p = .468) and tremor (Wilcoxon matched-pairs, p = .228). Although meaningful correlations were obtained, they do not conclusively indicate that the two tests measure the same concept of coordination. Therefore, it is suggested that the instrumented evaluation be used to complement the traditional clinical evaluation to increase the degree of objectivity in clinical measurement.