Original Article Ann Rehabil Med 2016;40(6):1048-1056 pISSN: 2234-0645 • eISSN: 2234-0653 https://doi.org/10.5535/arm.2016.40.6.1048

Annals of Rehabilitation Medicine

Quantitative Muscle Ultrasonography in Carpal Tunnel Syndrome Hyewon Lee, MD, Sungju Jee, MD, PhD, Soo Ho Park, MD, Seung-Chan Ahn, MD, Juneho Im, MD, Min Kyun Sohn, MD, PhD Department of Rehabilitation Medicine, Chungnam National University School of Medicine, Daejeon, Korea

Objective To assess the reliability of quantitative muscle ultrasonography (US) in healthy subjects and to evaluate the correlation between quantitative muscle US findings and electrodiagnostic study results in patients with carpal tunnel syndrome (CTS). The clinical significance of quantitative muscle US in CTS was also assessed. Methods Twenty patients with CTS and 20 age-matched healthy volunteers were recruited. All control and CTS subjects underwent a bilateral median and ulnar nerve conduction study (NCS) and quantitative muscle US. Transverse US images of the abductor pollicis brevis (APB) and abductor digiti minimi (ADM) were obtained to measure muscle cross-sectional area (CSA), thickness, and echo intensity (EI). EI was determined using computerassisted, grayscale analysis. Inter-rater and intra-rater reliability for quantitative muscle US in control subjects, and differences in muscle thickness, CSA, and EI between the CTS patient and control groups were analyzed. Relationships between quantitative US parameters and electrodiagnostic study results were evaluated. Results Quantitative muscle US had high inter-rater and intra-rater reliability in the control group. Muscle thickness and CSA were significantly decreased, and EI was significantly increased in the APB of the CTS group (all p4.3 ms; (3) difference between distal sensory latency of the median nerve at the wrist and palm level >1.6 ms [21]. Based on the electrodiagnostic findings, patients’ hands were divided into 5 subgroups using the severity grading system based on the modified Padua criteria [22]. Statistical analysis Intraclass correlation coefficient (ICC) was used to quantify inter-rater and intra-rater reliability for quantitative US in control subjects. We interpreted the results considering that an ICC above 0.75 indicated excellent reliability, ICC between 0.4 to 0.75 indicated fair to good reliability, and ICC below 0.4 had poor reliability [23]. Differences in muscle thickness, CSA, and EI between the CTS patient and control groups were analyzed using

Sex Male Female Lesion side Bilateral Right Left Age (yr) Height (cm) Weight (kg) Hand dominance Right Left CTS severity (hands)a) Minimal Mild Moderate Duration (mo)b)

CTS group

Control group

10 10 16 2 2 54.9±11.5 164.3±9.9 65.9±12.5 20 0 2 26 8 9.8±13.2

10 10

52.7±14.9 163.7±10.1 63.4±13.9 18 2 -

Values are presented as number or mean±standard deviation. CTS, carpal tunnel syndrome. a) Using the severity grading system based on the modified Padua criteria. b)Duration after CTS symptoms.

the independent t-test. The p-values

Quantitative Muscle Ultrasonography in Carpal Tunnel Syndrome.

To assess the reliability of quantitative muscle ultrasonography (US) in healthy subjects and to evaluate the correlation between quantitative muscle ...
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