The validity of spatiotemporal gait analysis using dual laser range sensors: a cross-sectional study.

BACKGROUND: The spatiotemporal parameters were used for sophisticated gait analysis in widespread clinical use. Recently, a laser range sensor has been proposed as a new device for the spatiotemporal gait measurement. However, measurement using a single laser range sensor can only be used for short-range gait measurements because the device irradiates participants with lasers in a radial manner. For long-range gait measurement, the present study uses a modified method using dual laser range sensors installed at opposite ends of the walking path. The aim of present study was to investigate the concurrent validity of the proposed method for spatiotemporal gait measurement by comparison to a computer-based instrumented walkway system. METHODS: Ten healthy participants were enrolled in this study. Ten-meter walking tests at 100, 75, and 50% of the comfortable speed were conducted to determine the concurrent validity of the proposed method compared to instrumented walkway measurements. Frequency distributions of errors for foot-contact (FC) and foot-off (FO) estimated times between the two systems were also calculated to determine the adequacy of estimation of FC and FO from three perspectives: accuracy (smallness of mean error), precision (smallness of variability), and unambiguity (monomodality of histogram). Intra-class correlation coefficient (2,1) was used to determine the concurrent validity of spatiotemporal parameters between the two systems. RESULT: The results indicate that the detection times for FC and FO estimated by the proposed method did not differ from those measured by the instrumented walkway reference system. In addition, histogram for FC and FO showed monomodality. Intra-class correlation coefficients of the spatiotemporal parameters (stance time: 0.74; double support time: 0.56; stride time: 0.89; stride length: 0.83; step length: 0.71; swing time: 0.23) were not high enough. The mean errors of all spatiotemporal parameters were small. CONCLUSIONS: These results suggest that the proposed lacks sufficient concurrent validity for spatiotemporal gait measurement. Further improvement of this proposed system seems necessary. TRIAL REGISTRATION: UMIN000032710. Registered 24 May 2018. Retrospectively registered.

Distant peritoneal metastasis to a mesh-plug prosthesis in a gastrointestinal cancer patient: report of a case.

A case of distant metastasis to mesh-plug prosthesis in gastrointestinal cancer is presented herein. An 88-year-old man had received mesh-plug repair with high ligation for a recurrence of a right inguinal hernia. Six months later, advanced gastric cancer and advanced transverse colon cancer were detected, and therefore a distal gastrectomy and partial colectomy were performed. Two weeks after the operation, the patient complained of right groin tenderness, and the mesh-plug prosthesis was removed to control any infection. A histopathological investigation demonstrated adenocarcinoma in the plug prosthesis. The patient died of carcinomatosis peritonei 45 days after the last operation.

Clinicopathological characteristics of superficial spreading type early gastric cancer.

BACKGROUND AND OBJECTIVES: Superficial spreading type early gastric cancer is characterized by its atypical growth pattern and occasionally indistinct tumor margin. Because it is a rare form of early gastric cancer, the clinicopathological details are not apparent. The aim of this study was to clarify the clinicopathological features of the superficial spreading type of early gastric cancer. METHODS: A retrospective study was conducted in 1,062 surgically resected patients with early gastric cancer. Hospital records were compared between patients with superficial spreading type early gastric cancer and those with more common types of early gastric cancer. RESULTS: Sixty-nine patients (6.9%) had superficial spreading lesions. The male to female ratio was 1.2:1. The most frequent histological type was signet-ring cell carcinoma (32%). The distinguishing histopathological features were submucosal invasion (67%), lymphatic invasion (32%), and lymph node metastasis (30%). There were discrepancies in tumor area between surgical findings and pathological diagnosis in 24 patients (35%) with superficial spreading type. More extensive lymph node dissection was performed and all patients survived in the group with superficial spreading lesions. CONCLUSIONS: The most appropriate treatment for the superficial spreading type of early gastric cancer is wide surgical resection with extensive lymph node dissection.