High-frequency Ultrasonography In Diagnosis Research Articles

Electrophysiological examination and high frequency ultrasonography for diagnosis of radial nerve torsion and compression

This study aims to evaluate the value of electrophysiological examination and high frequency ultrasonography in the differential diagnosis of radial nerve torsion and radial nerve compression.Patients with radial nerve torsion (n = 14) and radial nerve compression (n = 14) were enrolled. The results of neurophysiological and high frequency ultrasonography were compared.Electrophysiological examination and high-frequency ultrasonography had a high diagnostic rate for both diseases with consistent results. Of the 28 patients, 23 were positive for electrophysiological examination, showing decreased amplitude and decreased conduction velocity of radial nerve; however, electrophysiological examination cannot distinguish torsion from compression. A total of 27 cases showed positive in ultrasound examinations among all 28 cases. On ultrasound images, the nerve was thinned at torsion site whereas thickened at the distal ends of torsion. The diameter and cross-sectional area of torsion or compression determined the nerve damage, and ultrasound could locate the nerve injury site and measure the length of the nerve.Electrophysiological examination and high-frequency ultrasonography can diagnose radial neuropathy, with electrophysiological examination reflecting the neurological function, and high-frequency ultrasound differentiating nerve torsion from compression.

The Role of High Frequency Ultrasonography in Diagnosis of Acute Closed Mallet Finger Injury

To evaluate the role of high frequency ultrasonography in diagnosis of acute closed mallet finger injury. 36 patients diagnosed with mallet finger were included in this study. All patients underwent ultrasonography, magnetic resonance imaging(MRI) and X-ray examinations. A new kind of classification of acute mallet finger injury based on ultrasonography findings was described. The difference in terms of extensor tendon injury and bony fragment identification ability among the three types of examinations were described respectively. Either an injury of extensor digital tendon or an avulsion fracture of distal phalangeal base was identified clearly on ultrasonography. Among the 36 cases, avulsion fracture of the distal phalangeal base was found without extensor tendon rupture in Type A, complete rupture of the extensor tendon was found without avulsion fracture in Type B, and contusion of the extensor tendon was found in Type C. Compared with X-ray, ultrasonography and MRI could show the extensor tendon injury clearly. While compared with MRI, ultrasonography and X-ray was more sensitive in showing bony fragment. High frequency ultrasonography could be an accurate, reliable, and non-invasive diagnostic imaging method in diagnosis of acute close mallet finger injury.

Value of High Frequency Ultrasonography in Diagnosis and Surgical Repair of Traumatic Finger Tendon Ruptures

Objective: To investigate the value of high frequency ultrasonography in the diagnosis of zone 2 flexor tendon injuries. Subjects and Methods: Ninety-two patients (49 males and 43 females, mean age 32.6 ± 11.2 years) with zone 2 flexor tendon injuries in one or more digits were randomly divided into a study (n = 46, 95 digits) and a control group (n = 46, 90 digits). In the study group, preoperative ultrasound was performed and surgical repair was conducted based on ultrasonographic findings. Diagnosis and surgical repair of the control group was based on history of trauma and physical examination. Results: Types of ruptures (complete or partial) and the location of the distal end of the ruptured tendon diagnosed by preoperative ultrasonography were consistent with surgical findings in all cases (95/95, 100%) of the study group, whereas the concordance rate between clinically diagnosed ruptures and surgical findings was only 34.4% (31/90) in the control group (p = 0.02). Conclusion: Preoperative high frequency ultrasound examination yielded excellent diagnostic accuracy for zone 2 flexor tendon injuries.

Clinical Value of High Frequency Ultrasonography in Diagnosis of Testicular Torsion

Objective To investigate the clinical value of high frequency uhrasonography(HFU),color Doppler flow imaging(CDFI)and color Doppler power imaging(CDPI)in the diagnosis of testicular torsion.Methods A total of 33 patients with the testis of torsion were chosen seguentially and confirmed with the clinical diagnosis.The shape.size and intemal echoes of the testis and epididymis were observed with HFU.Their blood flow were observed with CDFI and CDPI.Results The sensitivity,specificity and accuracy in diagnosis of testicular torsion by HFU were 97%、80%、95%respectively.Conclusion HFU.CDFI and CDPI play very important roles in the diagnosis of testicular torsion. Key words: High frequency ultrasonography; Color Doppler flow imaging; Color Doppler power imaging; Testicular torsion