OBJECTIVE: To determine which ultrasonographic measurement can be used as an indicator reflecting the severity of carpal tunnel syndrome (CTS), by comparing electrodiagnostic results with ultrasonographic measurements in females. Many previous studies have tried to reveal that the ultrasonography (US) can possibility be used for diagnosis and severity of CTS. However, the criteria are different by gender. Thus far, there have been many efforts towards providing patients with a CTS diagnosis and severity prediction using US, but studies' results are still unclear due to lack of data on gender differences. METHODS: We collected data from 54 female patients. We classified the severity of CTS according to electrodiagnostic results. Ultrasonographic measurements included proximal and distal cross-sectional areas of the median nerve and carpal tunnel. RESULTS: The severity by electrodiagnostic results statistically correlated to the proximal cross-sectional area (CSA) of the median nerve and carpal tunnel. However, there was no relationship between the proximal and distal nerve/tunnel indexes and the severity by electrodiagnostic results. CONCLUSION: In female patients with CTS, the proximal CSAs of the median nerve and carpal tunnel increase. They correlate with the severity by electrodiagnostic findings. The CSA of the proximal median nerve could be particularly used as a predictor of the severity of CTS in female patients. However, the nerve/tunnel index is constant, irrespective of the severity of CTS.
Carpal Tunnel Syndrome* ; Diagnosis ; Electrodiagnosis ; Female* ; Humans ; Median Nerve ; Ultrasonography

Carpal tunnel syndrome (CTS) is a common entrapment neuropathy caused by compression of the median nerve at the wrist. Although symptoms and signs of CTS are widely known, it is often difficult to make a correct diagnosis. A clinical examination, electrophysiological studies, and ultrasonographic evaluation have similar sensitivities and specificities, and combining them improves diagnostic yield. However, evidence about the optimal treatment has not been well established. We review the clinical manifestations, diagnostic methods, and treatment options for CTS.
Carpal Tunnel Syndrome* ; Diagnosis ; Median Nerve ; Neural Conduction ; Ultrasonography ; Wrist

No abstract available.
Carpal Tunnel Syndrome/*ultrasonography ; Electromyography ; Fingers/innervation ; Humans ; Median Nerve/*ultrasonography ; Ultrasonography, Doppler

BACKGROUND AND PURPOSE: To determine the correlation between the cross-sectional area (CSA) of the median nerve measured at the wrist using three-dimensional (3D) ultrasonography (US) and the electrophysiological severity of carpal tunnel syndrome (CTS). METHODS: We prospectively examined 102 wrists of 51 patients with clinical CTS, which were classified into 3 groups according to the electrodiagnostic (EDX) findings. Median nerve CSAs were measured using 3D US at the carpal tunnel inlet and at the level of maximal swelling. RESULTS: Ten wrists were negative for CTS. Of the 92 CTS-positive wrists, 23, 30, and 39 were classified as having mild, moderate, and severe CTS, respectively. The median nerve CSA differed significantly between the severe- and moderate-CTS groups (p=0.0007 at the carpal tunnel inlet and p<0.0001 at the maximal swelling site). There was a correlation between median nerve CSA and EDX parameters among those wrists with severe and mild CTS (p<0.0001 at both sites). CONCLUSIONS: The median nerve CSA as measured by 3D US could provide additional information about the severity of CTS, as indicated by the strong correlation with standard EDX findings.
Bays ; Carpal Tunnel Syndrome* ; Humans ; Median Nerve ; Prospective Studies ; Ultrasonography* ; Wrist

We evaluated the morphologic changes that follow division of transverse carpal ligament in patients with carpal tunnel syndrome using high resolution sonography. Twenty hands of 10 patients underwent high- resolution ultrasonographic studies before the operation and 8 months after the operation. They were all diagnosed as bilateral idiopathic CTS. We evaluated the configuration of the median nerve and carpal tunnel at different three levels of the wrist; the distal radiocarpal joint level, the pisiform level, and the hook of hamate level. The median nerve remarkably gained its thickness at distal two levels after the operation. The morphology of carpal tunnel has also changed at distal levels. Increase in the anteroposterior diameter at distal two levels was obvious, but the cross sectional area of the carpal tunnel was increased significantly only at the hook of hamate level. The transverse diameters of the carpal tunnel were not significantly changed. As above, we found that the median nerve gained its volume significantly at distal part of carpal tunnel postoperatively, and the volumetric increase of carpal tunnel would have resulted from an anterior displacement of newly formed transverse carpal ligament and not from a widening of the bony carpal arch.
Carpal Tunnel Syndrome* ; Hand ; Humans ; Joints ; Ligaments ; Median Nerve ; Ultrasonography* ; Wrist

OBJECTIVE: To establish the cutoff value of cross-sectional area (CSA) of the median nerve at the wrist, for determination of electrophysiologically moderate and severe carpal tunnel syndrome (CTS). METHODS: The prospective study was conducted among patients suspected of having CTS. A total of 106 patients (185 symptomatic wrists) received nerve conduction study (NCS) and ultrasonography. To establish a cutoff value, various diagnostic properties were calculated across a range of the CSA. RESULTS: A mean±standard deviation of CSA of the median nerve of normal and mild, moderate and severe CTS was 9.4±2.1, 12.0±2.7, 13.8±4.7, and 15.4±4.1 mm², respectively. The positive relationship between CTS severities and CSA was observed (rs=0.56). A 14 mm² CSA had sufficient power to rule in moderate and severe CTS, with a specificity of 91.4% and sensitivity of 42.3%. In addition, it showed a post-test probability (positive predictive value) of 86.3% as against a pre-test probability of 56.2%. CONCLUSION: Patients who had ≥14 mm² of median nerve CSA had very high probability of moderate to severe CTS.
Carpal Tunnel Syndrome* ; Electrophysiology ; Humans ; Median Nerve* ; Neural Conduction ; Prospective Studies ; Sensitivity and Specificity ; Ultrasonography ; Wrist*

OBJECTIVE: To investigate a diagnostic value of ultrasonography in carpal tunnel syndrome (CTS) patients and to evaluate a correlation of sonographic measurements with the degree of electrodiagnostic abnormalities and clinical severity. METHODS: Two-hundred-forty-six symptomatic hands in 135 patients and 30 asymptomatic hands in 19 healthy individuals as control group were included. In ultrasonographic study, we measured the cross-sectional area (CSA) and flattening ratio (FR) of the median nerve at the pisiform as well as palmar bowing (PB) of the flexor retinaculum. Sensitivity and specificity of ultrasonographic measurements were evaluated and ultrasonographic data from the symptomatic and control hands were compared to the grade of electrodiagnostic and clinical severity. RESULTS: The mean CSA was 13.7+/-4.2 mm2 in symptomatic hands and 7.9+/-1.3 mm2 in asymptomatic hands. The mean FR was 4.2+/-1.0 in symptomatic hands and 3.4+/-0.4 in asymptomatic hands. The mean PB was 3.5+/-0.5 mm in symptomatic hands and 2.6+/-0.3 mm in asymptomatic hands. Statistical analysis showed differences of the mean CSA, FR and PB between groups were significant. A cut-off value of 10 mm2 for the mean CSA was found to be the upper limit for normal value. Both the mean CSA and PB are correlated with the grade of electrophysiological abnormalities and clinical severity, respectively. CONCLUSION: Ultrasographic measurement of the CSA and PB is helpful to diagnose CTS as a non-invasive and an alternative modality for the evaluation of CTS. In addition, ultrasonography also provides a reliable correlation with the grade of electrodiagnostic abnormalities and clinical severity.
Carpal Tunnel Syndrome* ; Diagnosis* ; Hand ; Humans ; Median Nerve ; Reference Values ; Sensitivity and Specificity ; Ultrasonography*

BACKGROUND: To compare the diagnostic value between Phalen's test and reverse Phalen's test using a morphological change of the median nerve and the carpal tunnel in diabetics and normal controls seen by high-resolution ultrasonography and to research on an ultrasonography as an available tool for the screening and follow up aid-test of the carpal tunnel syndrome(CTS). METHODS: A cross-sectional area and a flattening ratio of the median nerve, and a cross-sectional area of the carpal tunnel were measured in neutral, maximally flexed(Phalen's test), and maximally extended (reverse Phalen's test) positions in 59 wrists of 30 normal controls and 60 wrists of 30 diabetics. RESULTS: 1) In controls and diabetics, the mean cross-sectional area of median nerve at the hamatum were 8.8/10.2 mm2, 8.0/9.5 mm2, 8.3/9.4 mm2, the mean flattening ratio were 3.0/3.0 mm2, 2.4/2.0 mm2, 3.2/3.0 mm2, the mean cross-sectional area of carpal tunnel were 176.5/197.7 mm2, 157.9/187.0 mm2, 170.6/192.5 mm2 in neutral, maximal flexion and maximal extension. 2) In controls, the cross-sectional area of median nerve and carpal tunnel were significantly decreased in maximal flexion(p<0.01), and in maximal extension(p<0.01). 3) In controls, the mean flattening ratio of median nerve was revealed significant change in maximal flexion(p<0.01), and in maximal extension(p<0.01). 4) In diabetics, the flattening ratio was significantly decreased in maximal flexion(p<0.01) with com- paring to neutral position. 5) In diabetics, the cross-sectional area of median nerve and carpal tunnel were significantly increased in all positions(p<0.05), and the mean flattening ratio of median nerve was similar to controls. CONCLUSION: In diabetics, increased cross-sectional area of median nerve can be explained by swelling of median nerve, also increased cross-sectional area of carpal tunnel is can be said to have taken place by the decreasing of the useful space in between the median nerve and carpal tunnel, this show that the diabetics have the high risk of the CTS. Phalen's test reveals higher degree of irritation to median nerve, The high-resolution ultrasonography is suggested as an available tool for the screening and follow up aid-test for the CTS
Carpal Tunnel Syndrome ; Follow-Up Studies ; Mass Screening ; Median Nerve* ; Ultrasonography ; Wrist*

BACKGROUND AND PURPOSE: We determined the reliability of ultrasonography (US) measurements for diagnosing carpal tunnel syndrome (CTS) and their correlation with symptom duration and electrophysiology findings. We determined whether the ratio of the median-to-ulnar cross-sectional areas (CSAs) can support CTS diagnoses. METHODS: The pisiform CSA (CSA(pisiform)), swelling ratio (SR), palmar bowing, and CSA(pisiform)/ulnar CSA (CSA(ulnar)) measurements made in two subgroups of CTS patients (having sensory affection alone or having both sensory and motor affection) were compared with controls. CSA(ulnar) was measured in Guyon's canal at the level of most-protuberant portion of the pisiform bone. RESULTS: The values of all of the measured US parameters were higher in patients with CTS (n=50) than in controls (n=62). CSA(pisiform) could be used to diagnose CTS of mild severity. All of the parameters were positively correlated with the distal latency of the compound muscle action potential, and all of them except for SR were negatively correlated with the sensory nerve conduction velocity. A CSA(pisiform)/CSA(ulnar) ratio of ≥1.79 had a sensitivity of 70% and a specificity of 76% for diagnosing CTS. CONCLUSIONS: Only CSA(pisiform) measurements were reliable for diagnosing early stages of CTS, and CSA(pisiform)/CSA(ulnar) had a lower diagnostic value for diagnosing CTS.
Action Potentials ; Carpal Tunnel Syndrome* ; Diagnosis ; Electrophysiology ; Humans ; Neural Conduction* ; Pisiform Bone ; Sensitivity and Specificity ; Ultrasonography

BACKGROUND AND PURPOSE: We determined the reliability of ultrasonography (US) measurements for diagnosing carpal tunnel syndrome (CTS) and their correlation with symptom duration and electrophysiology findings. We determined whether the ratio of the median-to-ulnar cross-sectional areas (CSAs) can support CTS diagnoses. METHODS: The pisiform CSA (CSA(pisiform)), swelling ratio (SR), palmar bowing, and CSA(pisiform)/ulnar CSA (CSA(ulnar)) measurements made in two subgroups of CTS patients (having sensory affection alone or having both sensory and motor affection) were compared with controls. CSA(ulnar) was measured in Guyon's canal at the level of most-protuberant portion of the pisiform bone. RESULTS: The values of all of the measured US parameters were higher in patients with CTS (n=50) than in controls (n=62). CSA(pisiform) could be used to diagnose CTS of mild severity. All of the parameters were positively correlated with the distal latency of the compound muscle action potential, and all of them except for SR were negatively correlated with the sensory nerve conduction velocity. A CSA(pisiform)/CSA(ulnar) ratio of ≥1.79 had a sensitivity of 70% and a specificity of 76% for diagnosing CTS. CONCLUSIONS: Only CSA(pisiform) measurements were reliable for diagnosing early stages of CTS, and CSA(pisiform)/CSA(ulnar) had a lower diagnostic value for diagnosing CTS.
Action Potentials ; Carpal Tunnel Syndrome* ; Diagnosis ; Electrophysiology ; Humans ; Neural Conduction* ; Pisiform Bone ; Sensitivity and Specificity ; Ultrasonography