Orthopedic Care and Consultation
Hyperextgension casting is a non operative method to treat thoracolumbar spine injuries where a cast
is applied in position of hyperextension.
Popularity: 3% [?]
29 years lady was sitting in auto rickshaw which was struck by a car from behind. THe woman was thrown out of the auto rickshaw and the auto rickshaw fell on the lady.
She was brought to casualty of our hospital and found have injured her pelvis and spine along with paraplegia.
The xray in picture is lateral view of the spine and shows fracture of L3 vertebra.
MRI of the spine revealed a retropulsed fragment as well. She was operated upon and the spine was stabilized using pedicle screw system.
Popularity: 5% [?]
The implant material, its shape, size and the method of affects the of stress transfer to the bone. Implant loosening, and fracture of the femur or the implant are risks that arise from stress transfers to the bone. At the same time stress also provides stimulus for maintaining bone mass.
Modulus of elasticity of the implant material affects the stress that it would cause. A decrease in the modulus of the stem, stem length and cross sectional area causes a decrease in the stress in the stem. But it would increase the stress in the proximal third of the cement mass, which transfers these stresses to the surrounding bone. [Read more...]
Popularity: 5% [?]
Stress shielding means a reduction in the bone density as a result of removal of normal stress from the bone by an implant. For example it occurs after hip replacement when the normal bone is replaced by an implant.
This is because in a normal person the bone would remodel in response to the loads it is placed under.
When a hip is replaced as in total hip replacement, the load that was usually placed on the bone would decrease and hence would become less dense.
Popularity: 4% [?]
Femoral offset is the distance from the center of rotation of the femoral head to a line dissecting the long axis of the femur. In case of total replacement hip the the offset is considered as the distance from the center of rotation of the femoral head to a line bissecting the long axis of the stem.
Normal femoral offset varies between 30 amd 60 mm.
Image Credit: http://www.traumazamora.org/articulos/offset/offset.html
A decrease in femoral offset would move the femur closer to the pelvis medially. [Read more...]
Popularity: 5% [?]
Hip joint biomechanics are quite complex due to pelvic motion associated with it and range of movements it produces.
During normal gait, on heel-strike, the hip moves into 3o degree of flexion and at toe-off [when the foot is finally off the ground] about 10° of extension. The range of abduction to adduction is about 11°, and for internal-external rotation, the range is about 8°.
During different phases of gait cycle, different forces act on femoral head. Approximately two thirds of the hip force is produced by the abductors.
The directions of the resultant force on the joint are important to the function of total hips. [Read more...]
Popularity: 7% [?]
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