Data Trace Editor – Femoral Anteversion: – femoral version is defined as the angular difference between axis of femoral neck and transcondylar axis of the knee; – normal values: – on average, femoral anteversion ranges from 30-40 deg at birth and decreases progressively throughout growth to about 15 deg at skeletal maturation; – … Read more
– Discussion: – aging of cement results in decreased elastic modulus and flexural and compressive strength, and increased creep deformation; – cracks occur as a result of creep deformation through voids in cement; – w/ poor cement technique and varus position of stem, x-ray evidence of loosening may be … Read more
– Patient Position: – ensure that patient has not rotated anteriorly, for this may allow acetabular component to be placed in retroverted position; – ensure that patient’s torso is not tilted inferiorly (as can occur from a bean bag), as this can cause reaming in an excessive … Read more
– Choices for Instrumentation: – Zielke Instrumentation: – used for treatment of rigid or mobile lumbar or thoracolumbar Scoliosis w/ lordosis; – CD instrumentation: – for patients who have a mobile lumbar or thoracolumbar curve; … Read more
– See: – Burst Frx – Thoracic & Thoracolumbar Spine : – Posterolateral Decompression: – Discussion: – frx at this level are frequently due to relative immobility of thoracic spine compared to the lumbar spine; – upper thoracic spine (T1 … Read more
– Discussion: – see native acetabular anteversion and femoral anteversion and acetabular component position – general considerations: – simple visualization of length of anterior/posterior walls gives an accurate measure of native anteversion; – references: – Femoral anteversion in THA and its lack of correlation with native acetabular anteversion. – … Read more
– See: – operative considerations for hip dyplasia – acetabular component revision – Discussion: – restoration of the normal hip center in acetabular reconstruction encourages restoration of normal biomechanics; – medial placement: – moving hip center medially improves efficiency of … Read more
– See: Total Hip Replacement Menu / acetabular component revision: – Surgical Technique: – preoperative planning: – acetabular biomechanics: – operative considerations for hip dyplasia – protrusio – types of components: … Read more
origin: the transverse process of the 6th to 10 Thoracic vertebrae; insertion: the spinous process of the 1st to 4th thoracic and 6th-7th cervical vertebrae; action: extends the spine and rotates it toward the opposite side; nerve supply: posterior rami of the thoracic nerves, T1 to T6; synergists: Longissimus Thoracis, Iliocostalis thoracis, Spinalis Thoracis
– See: – Burst Fractures – Thoracic and Thoracolumbar Spine: – Discussion: – results from hyperflexion, which produces wedge compression of one or more vertebral bodies; – due to the rigidity of the rib cage, most of these frxs are stable; – thoracic spinal … Read more