Abstract
This study aimed to demonstrate that the simple tracing test (STT) is useful for assessing the hand dexterity in patients with cervical spondylotic myelopathy (CSM) by comparing STT scores between healthy volunteers and CSM patients. This study included 25 CSM patients and 38 healthy volunteers. In the STT, the participants traced a sine wave displayed on a tablet device at a comfortable pace, and the tracing accuracy, changes in the total sum of pen pressures, and tracing duration were assessed. Data were analyzed using an artificial neural networks (ANN) model to obtain STT scores. All participants were evaluated using the subsection for the upper extremity function of the Japanese Orthopaedic Association (JOA) scoring system for cervical myelopathy (JOA subscore for upper extremity function) and the grip and release test (GRT). The results were compared with the STT scores. The mean STT scores were 24.4 ± 32.8 in the CSM patients and 84.9 ± 31.3 in the healthy volunteers, showing a significant difference. The STT scores showed highly positive correlations with both the JOA subscore for upper extremity function (r = 0.66; P < 0.001) and GRT values (r = 0.74; P < 0.001). Furthermore, receiver operating characteristic analysis showed an area under the curve of 0.89 (95% confidence interval, 0.76–1.00), demonstrating that STT has excellent discriminative ability. This study revealed that STT enables accurate assessment of the hand dexterity in CSM patients.
Highlights
Cervical spondylotic myelopathy (CSM) is a spinal cord disorder resulting from age-related degeneration of the cervical spine; its major symptoms include sensory abnormalities of the limbs, movement disorders, and bladder and rectal disturbances[1,2,3]
Subjects trace a sine wave displayed on a tablet device at a comfortable pace, and the tracing accuracy, changes in the total sum of pen pressures, and tracing duration are analyzed
This study aimed to demonstrate that simple tracing test (STT) is useful for assessing the hand dexterity in cervical spondylotic myelopathy (CSM) patients by comparing STT scores between healthy volunteers and CSM patients
Summary
Cervical spondylotic myelopathy (CSM) is a spinal cord disorder resulting from age-related degeneration of the cervical spine; its major symptoms include sensory abnormalities of the limbs, movement disorders, and bladder and rectal disturbances[1,2,3]. A commonly used objective assessment method is the grip and release test (GRT), in which subjects clench and unclench their hands as frequently as possible for 10 seconds and are evaluated according to the frequency of movements[1]. This test must be administered by investigators with a certain level of experience who can differentiate normal clenching and unclenching of the hand from trick motion, a compensatory movement[9]. This study aimed to demonstrate that STT is useful for assessing the hand dexterity in CSM patients by comparing STT scores between healthy volunteers and CSM patients
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