BACKGROUND Compared to standing posture, sitting decreases lumbar lordosis, increases low back muscle activity, disc pressure, and pressure on the ischium, which are associated with occupational LBP. A sitting device that reduces spinal load and low back muscle activities may help increase sitting comfort and reduce LBP risk. The objective of this study is to investigate the biomechanical effec...

PURPOSE To correlate the radiographic measurement, cord diameter shown on magnetic resonance imaging (MRI), and clinical hand sign of cervical myelopathic patients. METHODS Patients with clinical cervical myelopathy who had had MRI in Kwong Wah Hospital between January 2001 and December 2002 were enlisted. Their cervical spine radiographs and clinical records were reviewed. RESULTS Of 36 pa...

Introduction Normally, the gemelli muscles are distinguished as attaching along the tendon of the obturator internus (OI) and collectively inserting onto the greater trochanter of the femur [1]. The usual origin of the gemellus superior (GS) lies on the external aspect of the ischial spine with the gemellus inferior (GI) originating from the superior surface of the ischial tuberosity [1, 2]. Th...

hereditary spastic paraplegias are highly heterogeneous neurodegenerative disorders with some special mutations. we report on a patient with pescavus, distal a myotrophy, hyper extended fingers, and pectus excavatum. neurological examination showed that he had proximal lower limbs weakness with a positive gower sign, exaggerated lower limbs deep tendon reflexes with spasticity, distal muscle wa...

BACKGROUND Reconstruction of ischial pressure sore defects is challenging due to extensive bursas and high recurrence rates. In this study, we simultaneously applied a muscle flap that covered the exposed ischium and large bursa with sufficient muscular volume and a profunda femoris artery perforator fasciocutaneous flap for the management of ischial pressure sores. METHODS We retrospectively...

The purpose of this case study was to describe the three-dimensional biomechanics of common ballet exercises in a ballet dancer with ischial tuberosity apophysitis. This was achieved by comparing kinematics between the symptomatic (i.e. ischial apophyseal symptoms) and contralateral lower limbs, as well as via reported pain. Results suggest consistent differences in movement patterns in this da...

A 36-year-old woman presented with joint pain and swelling, not improving with nonsteroidal anti-inflammatory drugs. Plain radiographs of feet, ankles, pelvis and lumbar spine were unremarkable. To rule out seronegative spondylarthropathy, MRI of the sacro-iliac joints (SIJ) was performed. The SIJ were normal, but multiple, nodular zones of bone marrow replacement were seen within the iliac and...

A new car seat design, which allows the back part of the seat (BPS) to lower down while a protruded cushion supports the lumbar spine, was quantitatively tested to determine its effectiveness and potentials in reducing whole-body vibration (WBV) and musculoskeletal disorders in automobile drivers. Nine subjects were tested to drive with the seat in: 1) the conventional seating arrangement (Norm...

This study sought to both assist in the selection of flaps for ischial pressure wound re-construction and to evaluate the overall complication rates associated with re-construction. A retrospective medical record review was conducted for 78 patients following the surgical re-construction of an ischial pressure sore. Records were reviewed for demographics, location of sores, methods of re-constr...

Study of the pelvis in 143 different mammals reveals that in quadrupeds the ischial spines are barely noticeable and are located posteriorly near the sacrum. In humans, the ischial spines are prominent and more anteriorly located. As a consequence of their position and size, the ischial spines in humans become an obstacle to parturition. Herein a theory is proposed to account for what appears t...