25 The purpose of this study was to quantify how volitional control of hip torque relates to 26 walking function post-stroke. Volitional phasing of hip flexion and extension torques was 27 assessed using a load-cell-instrumented servomotor drive system in 11 chronic stroke subjects 28 and 5 age-matched controls. Hips were oscillated from approximately 40 degrees of hip flexion 29 to 10 degrees ...

Although activity of the rectus femoris (RF) differs from that of the other synergists in quadriceps femoris muscle group during physical activities in humans, it has been suggested that the activation pattern of the vastus intermedius (VI) is similar to that of the RF. The purpose of present study was to examine activation of the VI during isometric hip flexion. Ten healthy men performed isome...

BACKGROUND Rehabilitation of elderly patients with sit-to-stand (STS) dysfunction includes retraining coordinated movement among participating body segments. Although trunk position is considered important, spinal movement has not been measured. OBJECTIVE The aim of this study was to describe the sagittal thoracolumbar kinematics and hip-lumbar interaction during the STS task in elderly peopl...

BACKGROUND The relationships between hip abductor and extensor strength and frontal plane hip and knee motions that are associated with anterior cruciate ligament injury risk are equivocal. However, previous research on these relationships has evaluated relatively low-level movement tasks and peak torque rather than a time-critical strength measure such as the rate of torque development (RTD). ...

BACKGROUND A capsular shift procedure has been described for the treatment of hip instability; however, the biomechanical effects of such a shift are unknown. PURPOSE To create a cadaveric model of hip capsule laxity and evaluate the biomechanical effects of a capsular shift used to treat hip instability on this model. STUDY DESIGN Controlled laboratory study. METHODS Eight cadaveric hips...

Introduction The incidence of degenerative osteoarthritis of the hip or knee joint and degenerative changes in the lumbar spine both increased with age. It was reported that lumbar lordosis and sacral inclination were related to the degree of extension of the hip, there may be an associated loss of lumbar lordosis. Many patients also have degenerative changes of the knee with loss of extension ...

[Purpose] This study compared the effects of three exercises performed in a prone position on the selective activation of the lumbar erector spinae (LES) and lumbar multifidus (LM) muscles in healthy males to investigate the effective method for selective activation of the LM. [Subjects] Twenty-two healthy males were recruited. Surface EMG data were collected from the right LES and LM muscles d...

Children with cerebral palsy often walk with diminished knee extension during the terminal-swing phase, resulting in a troublesome "crouched" posture at initial contact and a shortened stride. Treatment of this gait abnormality is challenging because the factors that extend the knee during normal walking are not well understood, and because the potential of individual muscles to limit terminal-...

The purpose of this study was to determine the effects of symmetric and asymmetric foot placements on joint moments during sit-to-stand movements. Three symmetric (foot-neutral, foot-back, and foot-intermediate) and three asymmetric foot placements (preferred stagger, nonpreferred stagger, and intermediate stagger) were tested. Standard (46 cm) and low (41 cm) seat heights were chosen to repres...