Reach Distance and Movement Strategy Patterns During the Functional Reach Test of Psychiatric Patients

Accuracy of classifying the movement strategy in the functional reach test using a markerless motion capture system

The purpose of this study was to examine the accuracy of classifying the movement strategy in the functional reach test (FRT) using a markerless motion capture system (MLS) on the basis of values acquired with a marker-based motion capture system (MBS). Sixty young, injury-free individuals participated in this study. The task action involved reaching forward in the standing position. Using the Microsoft Kinect v2 as an MLS and Vicon as a MBS, the coordinates of the hip joints, knee joints and ankle joints were measured. The hip and ankle joint angles during the task were calculated from the coordinate data. These angles between MLS and MBS were compared using a paired t-test. The accuracy of movement strategy defined using MLS was examined based on the MBS. A t-test showed a significant difference in both the hip and ankle joint angles between systems (p < .01). However, in case of using data of left ankle joint, indices of the classification accuracy of MLS were 0.825 for sensitivity, 1.000 for specificity, infinity for positive likelihood ratio and 0.175 for negative likelihood ratio. The results for the right joint angle were similar to those of the left joint angle. Although the absolute measures in the hip and joint angles obtained using MLS differ from MBS, the MLS may be useful for accurately classifying the movement strategy adopted in the FRT.

Effects of balance training on functional outcome after total knee replacement in patients with knee osteoarthritis: a randomized controlled trial

Objective:

To evaluate the effectiveness of additional balance training on mobility and function outcome in patients with knee osteoarthritis after total knee replacement.

Design:

A prospective intervention study and randomized controlled trial.

Setting:

A university-based teaching hospital.

Participants:

Patients who received total knee replacement surgery were recruited sequentially from the orthopedic department. They were randomly assigned to either the experimental group or control group.

Interventions:

The control group received conventional function training for eight weeks. The experimental group not only received the same conventional training as the control group, but also received additional balance exercises in each admission.

Main outcome measures:

Before and after training we took the following measurements: distance of functional forward reach; duration of single leg stance; timed sit-to-stand test; timed up-and-down stair test; timed 10-m walk; timed up-and-go test; and the Western Ontario and McMaster Universities Osteoarthritis Index score.

Results:

58 patients in the experimental group with a mean (SD) age of 71.4 (6.6) years and 55 in the control group with mean (SD) age of 72.9 (7.3) years, completed the study. After eight-weeks intervention with additional balance exercises, the experimental group demonstrated significant changes in 10-m walk ( P < 0.001, 95% confidence interval (CI): 3.6 to 4.4 seconds) and in timed up-and-go ( P < 0.001, 95% confidence interval: 2.6 to 3.4 seconds) tests. Significant changes of all other measures and Western Ontario and McMaster Universities Osteoarthritis Index score were also observed in the experimental group (all P < 0.001).

Conclusion:

Additional balance training exerted a significant beneficial effect on the function recovery and mobility outcome in patients with knee osteoarthritis after total knee replacement.