PubMed Health⌕ Search

Biomedical subjects

N Kuroshima

Publications and source records attributed to N Kuroshima.

7 recordsLinked to original sources
PubMed1994

Effects of endoscopic release of the transverse carpal ligament on carpal canal volume.

Ten hands in 10 patients with carpal tunnel syndrome were treated by subcutaneous transverse carpal ligament release using the Universal Subcutaneous Endoscope system. We analyzed the morphologic changes of the carpal canal with magnetic resonance imaging (0.064 T) before and after the operation. The axial plane, which includes the beak of the trapezium and the hook of the hamate, was selected for analysis. The soft tissue boundaries of the carpal canal were outlined at the plane. The cross-sectional area of the carpal canal was 232 +/- 49 mm2 before surgery and 320 +/- 108 mm2 after surgery. There was a 33% +/- 15% increase of the carpal canal cross-section after transverse carpal ligament release. The transverse carpal ligament became more outwardly convex after the operation. The endoscopic procedure is effective for increasing the cross-sectional area and volume of the carpal canal.

Adult↗
PubMed1991

[Admittance plethysmographic study of the recovery of vasomotor function in replanted fingers].

A new admittance plethysmograph, designed for the observation of finger vasomotor function, was employed to characterize circulation through replanted fingers and to clarify the relationship between the duration of ischemia and the postoperative recovery of finger sensory function. The study was carried out on 13 replanted fingers, 1 replanted arm and 12 contralateral normal fingers of 11 patients who underwent finger or arm replantation. To assess the reliability of this admittance plethysmograph, water-filled plethysmography was simultaneously performed, utilizing a newly devised electric volume sensor. Replanted fingers were divided into three groups based on vasomotor reactions; normal reaction group, vasodilation group and vasoconstriction group. This classification of vasomotor reactions had a high correlation ratio (0.86) with static two-point discrimination (2PD). Total ischemia time (time from amputation to reperfusion) did not correlate with static 2PD, while total warm ischemia time (obtained by subtracting the duration of cold storage of amputated finger from the total ischemia time) correlated well with static 2PD (gamma s = 0.766). The finding of various types of vasomotor reactions in replanted fingers suggests that normal vasomotor function cannot be restored by recovery of vasoconstrictor nerves alone, and that vasodilator nerves are also present in hands and fingers.

Adolescent↗
PubMed1989

Measurement of pressure in the carpal canal before and after endoscopic management of carpal tunnel syndrome.

In forty-six patients who had carpal tunnel syndrome, a technique of continuous infusion, given under local anesthesia and without a pneumatic tourniquet, was used to measure pressures in the carpal canal before and after endoscopic release of the transverse carpal ligament (retinaculum flexorum manus). Pressures were similarly measured in sixteen subjects in a control group. The mean preoperative pressures were significantly higher in the patients who had carpal tunnel syndrome than in the patients in the control group when the pressures were measured under four conditions: with the wrist in the resting position, with active grip, and with maximum passive extension and flexion of the wrist. The mean pressures improved significantly postoperatively and were in the range of values that were found under each condition for the control group. Measurement of pressure in the carpal canal before and after operation may be useful in diagnosing carpal tunnel syndrome and in determining the effectiveness of endoscopic management.

Adult↗
PubMed1988

Free functional musculocutaneous transfer: electrophysiological studies.

Transplanted autogenous muscles were electrophysiologically studied in 2 patients with forearm crush injury. Only fibrillation action potentials and positive sharp waves were seen at 1 month after the operation. Low-amplitude and short-duration muscular unit potentials (MUPs) appeared at 3 months and high-amplitude, long-duration and polyphasic MUPs were frequently seen at 6-7 months after the transplantation. The distal latencies of the evoked motor responses were gradually shortened from time to time and eventually became normal at about 1 year after the grafting. The mean consecutive difference became normal at about 6 months after the normalization of the distal latencies. We conclude that the motor endplate is functionally completed at about half a year after the completion of the myelination of the grafted nerve.

Action Potentials↗
PubMed1987

Three-loop technique for A2 pulley reconstruction.

A three-loop technique of secondary A2 pulley reconstruction has been developed by the authors. This method was applied to six fingers of six patients. The average follow-up period was 21 months and ranged from a minimum of 9 months to a maximum of 3 years. Total active motion of metacarpophalangeal, proximal interphalangeal, and distal interphalangeal joints improved by 30 degrees on the average from the preoperative 175 degrees to the postoperative 205 degrees. Similarly, tip palm distance showed an improvement of 10 mm on the average from the preoperative 32 mm to the postoperative 22 mm. Satisfactory grip functions were restored for all patients after the secondary pulley reconstruction.

Adolescent↗
PubMed1987

[Subcutaneous operation and examination under the universal endoscope].

Endoscopes are mainly used to study the internal structures of organs and tissues with inherent space. These include the gastrointestinal tract, abdominal space and joint space. The standard endoscope, however, cannot be used to evaluate tissues without such space. We have invented a new type of operation tube to be used with the arthroscope. This combination enables us to study subcutaneous soft tissues without inherent space. Our new device is a powerful tool to be used for evaluation of subcutaneous soft tissues in any part of the body. Surgical procedures can also be carried out with this device. Areas of future applications of our device will be extremely wide including orthopaedic surgery, plastic surgery and general surgery. The presentation will discuss the procedure for utilizing this new instrument.

Adult↗