Pneumolabyrinth following temporal bone fracture is an extremely rare condition. It results from air entering the inner ear when a communication between the air-filled middle ear spaces and inner ear is established. The imaging modality of choice for pneumolabyrinth is high-resolution computed tomography of the temporal bone. Treatment options include conservative management (bed rest, antibiot...

Spine fusion remains a common means of achieving stability in spinal surgery. Methods for obtaining fusion involve decortication of the host bed and introduction of a grafting material. Autologous bone has served as the standard material for these procedures in that its three cardinal properties encourage effective bone healing: osteogenic cells, an osteoconductive structure, and an osteoinduct...

OBJECTIVE To evaluate the therapeutic effects of radiotherapy on spinal bone metastases from hepatocellular carcinoma (HCC). METHODS A retrospective review was conducted on 24 ambulatory patients with spinal bone metastases from HCC treated by radiotherapy from 1995 to 2004. Ambulatory rate and local progression-free rate after radiotherapy were analyzed. Eight (33%) of 24 patients had radiog...

We present of a case of severe osteoporosis with thoracic myelopathy secondary to nontraumatic T8 compression fracture managed nonsurgically with 3.5 months of bed rest. Despite treatment with teriparatide starting at initial presentation, 1-year follow-up dual energy x-ray absorptiometry scan revealed a significantly greater than expected 19% reduction in lumbar spine bone mineral density (BMD...

Introduction Most body tissues are subjected to physical forces. The effects of biophysical force on bone remodeling have become increasingly evident in recent years. It is well known that extended periods of immobilization lead to bone loss. Mechanical loading is one of the few positive stimuli for bone formation, and the use of suitable exercise regimes has been proposed as being potentially ...

Biomedical implants require stiffnesses matching those of the surrounding bone to avoid stress shielding. Triply-periodic-minimal-surface (TPMS) structures have shown promising characteristics in preventing shielding; however, they are limited allowing for anisotropic stiffness properties that typically inherent bone. This paper presents an approach simplifying a TPMS structure so common geomet...

Introduction Osteoporosis is a disease characterized by low bone mass and structural deterioration of bone tissue, which leads to bone fragility and increased fracture risk. For prolonged bed rest, immobilization, and space flight, disuse atrophy of bone is prevalent in many animals including humans. However, black bears may not develop osteopenia during long periods of disuse (i.e., hibernatio...

Screw-shaped implants made from rods of commercially pure titanium (grade 1) and titanium-aluminum-vanadium (grade 5) were machined, and the implant surface structures were numerically described before being placed in rabbit tibiae for healing periods of 1 months, 6 months, and 12 months. Quantitative comparisons of the removal torque (Ncm) necessary to loosen the implants from the bone bed wer...

BACKGROUND The associations between nitrogen metabolism and bone turnover during bed rest are still not completely understood. METHODS We measured nitrogen balance (nitrogen intake minus urinary nitrogen excretion) and biochemical metabolic markers of calcium and bone turnover in six males before head-down tilt bed rest (baseline), during 2, 10, and 14 weeks of immobilization, and after reamb...