Effect of Leg Extension Angle on Knee Flexion Angle during Swing Phase in Post-Stroke Gait

Examination of effect and responder to real-time auditory feedback during overground gait for stroke: a randomized cross-over study

Real-time auditory feedback for overground gait was developed to simulate realistic gait practice. This study aimed to assess the effects of different auditory feedback conditions and identify patients with stroke who might benefit from auditory feedback based on physical function. Twenty patients with stroke participated in three 6-min gait trials: no feedback (control), auditory feedback focused on increasing ankle plantar flexion (ankle trial), and auditory feedback on increasing lower-leg extension angle (leg trial). Physical function was evaluated using the Short Physical Performance Battery (SPPB); gait function was assessed through gait speed, cadence, stride length, and joint motion using inertial sensors before and after each trial. Gait speed (P = 0.001), stride length (P < 0.001), ankle plantar flexion (P = 0.014), and leg extension angles (P = 0.020) improved significantly over time. Interaction effects between time and trial were observed for stride length (P = 0.001) and leg extension angle (P = 0.003). Among the auditory feedback trials, stride length (P = 0.012), length-time difference (P = 0.003), and leg extension angle (P = 0.008) increased significantly in the leg trial compared with the control trial. SPPB scores were independently associated with the benefit from the leg trial (odds ratio: 2.217, 95% confidence interval: 1.152-4.266, P = 0.017). Real-time auditory feedback focused on leg extension angle during gait may enhance gait speed by improving leg extension and optimizing spatial gait strategies.

Typical Changes in Gait Biomechanics in Patients with Subacute Ischemic Stroke

Background/Objectives: Gait dysfunction occurs in 80% of stroke survivors. It increases the risk of falls, reduces functional independence, and thus affects the quality of life. Therefore, it is very important to restore the gait function in post-stroke survivors. The purpose of this study was to investigate the functional changes of gait biomechanics in patients with hemiplegia in the subacute stage of ischemic stroke based on spatiotemporal, kinematic, and EMG parameters. Methods: Initial biomechanical gait analyses of 31 patients and 34 controls were selected. The obtained parameters were assessed and compared within and across the study groups (post-stroke hemiparetic patients and healthy controls) to determine the pathognomonic features of the hemiplegic gait. Results: The gait function asymmetry was characterized by reciprocal changes, i.e., harmonic sequences of gait cycles. The most significant changes were in the kinematics of the knee joint and the EMG activity in the anterior tibialis, gastrocnemius, and hamstring muscles on the paretic side. The movements in the lower extremity joints ranged from a typical amplitude decrease to an almost complete lack of movement or involuntary excessive movement, as can occur in the ankle joint. The knee joint showed two distinct patterns: a slight flexion throughout the entire gait cycle and knee hyperextension during the middle stance phase. Conclusions: The gait function asymmetry is characterized by reciprocal changes (in temporal gait parameters). The most significant changes included decreased amplitude in the knee joint and decreased amplitude of EMG of all muscles under study, except for the m. quadriceps femoris.

Gait analysis in patients with cerebral infarction and intracerebral hemorrhage walking with a body weight-supported walker

BackgroundThere is increasing recognition of the effectiveness of body weight-supported (BWS) walkers for stroke patients with hemiplegia. However, it is unclear whether the effectiveness of BWS walkers is because of the walker alone or the combined effect of the walker and body weight support.ObjectiveWe aimed to determine whether there are differences between normal, walker, and BWS walker gaits in patients after cerebral infarction (CI) and intracerebral hemorrhage (ICH).MethodsTwenty-one stroke patients with hemiplegia underwent trials under three gait conditions: normal, walker, and BWS walker gait. Spatiotemporal parameters and joint kinematics during walking were calculated using a three-dimensional motion analyzer. We further examined differences in effects depending on CI and ICH.ResultsSpeed and cadence improved in the walker gait and BWS gait groups compared with the normal gait group. In addition, the percentage of the stance and swing phases was improved in BWS walker gait compared to normal gait. Both patients with CI and those with ICH showed similar trends in gait parameters by BWS Walker.ConclusionsThese results suggest that using a BWS walker improves walking in stroke patients with hemiplegia in terms of gait parameter, and is a useful tool for gait training.

Inertial measurement unit-based real-time feedback gait immediately changes gait parameters in older inpatients: a pilot study

The effect of gait feedback training for older people remains unclear, and such training methods have not been adapted in clinical settings. This study aimed to examine whether inertial measurement unit (IMU)-based real-time feedback gait for older inpatients immediately changes gait parameters. Seven older inpatients (mean age: 76.0 years) performed three types of 60-s gait trials with real-time feedback in each of the following categories: walking spontaneously (no feedback trial); focused on increasing the ankle plantarflexion angle during late stance (ankle trial); and focused on increasing the leg extension angle, which is defined by the location of the ankle joint relative to the hip joint in the sagittal plane, during late stance (leg trial). Tilt angles and accelerations of the pelvis and lower limb segments were measured using seven IMUs in pre- and post-feedback trials. To examine the immediate effects of IMU-based real-time feedback gait, multiple comparisons of the change in gait parameters were conducted. Real-time feedback increased gait speed, but it did not significantly differ in the control (p = 0.176), ankle (p = 0.237), and leg trials (p = 0.398). Step length was significantly increased after the ankle trial (p = 0.043, r = 0.77: large effect size). Regarding changes in gait kinematics, the leg trial increased leg extension angle compared to the no feedback trial (p = 0.048, r = 0.77: large effect size). IMU-based real-time feedback gait changed gait kinematics immediately, and this suggests the feasibility of a clinical application for overground gait training in older people.

A pilot study comparing prosthetic to sound limb gait mechanics during a turning task in people with transtibial amputation

BACKGROUND

Observational gait analysis is frequently used by clinicians to subjectively assess straight walking but is not often used to examine turning. Interlimb comparisons of phase- specific turning biomechanics in people with unilateral lower limb amputation has not previously been documented.

METHODS

A retrospective examination of gait kinematics and kinetics from five participants with unilateral transtibial amputation was performed. Data were collected during 90° step and spin turns capturing three distinct turning steps. Gait metrics of interest included: total turn time, stance time, peak knee flexion angle during Pre-Swing and Initial Swing gait phases, peak hip flexion and extension, ground reaction impulse, and whole body angular momentum. Statistical comparisons were made based on turn type between sound and prosthetic limbs.

FINDINGS

During the three turn steps (approach, apex, depart), participants spent significantly more time (P < 0.01) on their sound limb compared to their prosthetic limb regardless of turn type. Additionally, the prosthetic limb hip and knee exhibited more flexion (P < 0.05) during the apex step of turns, and whole body angular momentum was higher when the sound limb was used during the apex step of a turn (P < 0.05).

INTERPRETATION

This descriptive study offers the first phase-specific quantification of turning biomechanics in people with lower limb amputation. Results indicate that people with unilateral transtibial amputation spend more time on and experience higher impulses through their sound compared to their prosthetic limb during 90° turns, and that the prosthetic limb is performing differently than the sound limb, potentially increasing risks of injury or falls.

Kinetic and kinematic parameters associated with late braking force and effects on gait performance of stroke patients

Late braking force (LBF) is often observed in the late stance phase of the paretic lower limb of stroke patients. Nevertheless, the effects and association of LBF remain unclear. We examined the kinetic and kinematic parameters associated with LBF and its effect on walking. Herein, 157 stroke patients were enrolled. Participants walked at a comfortable speed selected by them, and their movements were measured using a 3D motion analysis system. The effect of LBF was analyzed as a linear relationship with spatiotemporal parameters. Multiple linear regression analyses were performed with LBF as the dependent variable and kinetic and kinematic parameters as independent variables. LBF was observed in 110 patients. LBF was associated with decreased knee joint flexion angles during the pre-swing and swing phases. In the multivariate analysis, trailing limb angle, cooperativity between the paretic shank and foot, and cooperativity between the paretic and non-paretic thighs were related to LBF (p < 0.01; adjusted R² = 0.64). LBF in the late stance phase of the paretic lower limb reduced gait performance in the pre-swing and swing phases. LBF was associated with trailing limb angle in the late stance, coordination between the paretic shank and foot in the pre-swing phase, and coordination between both thighs.