Data Trace Editor – Discussion: – MRI findings in normal subjects (from Boden-SD) – note that there is a 29% prevalence of disc herniation in asymtomatic individuals; – patients less than 60 years of age: – 20 per … Read more
– See: – MRI of Hip: – Johns Hopkins – MRI Evaluation of AVN – Discussion: – magnetic resonance imaging is probably the most accurate imaging modality for dx of AVN of femoral head; – MRI imaging is also used to outline the area of involvement; … Read more
– See: – MRI Spine: Discussion; – Role of CT in C-spine Injuries: – Discussion: – for visualizing soft tissue and neural elements, & unsuspected disc herniations in presence of cercial spine fractures; – disc herniation may indicate disruption of anterior or posterior longitudinal ligament; – MRI … Read more
– See: MRI of Spinal Osteomyelitis – Discussion: – may help identify associated abscesses, sequestra, and sinus tracts; – MRI may reveal specific changes in bone marrow; – in bone marrow, inflammatory exudate has decreased signal on T1 as compared to normal marrow; – infected marrow will have … Read more
– See: MRI of Spine – Discussion: – MRI is sensitive for detecting infection & is specific in differentiating infection from tumor; – infection: – T1 weighted images: – decreased signal intensity in vertebral bodies & disk w/ … Read more
– Technique: – protocols: fat suppressed T2 wt images and proton density weighted images – older protocol: T1 & T2 coronal oblique spin-echo sequences with use of 14 cm field of view and a four-millimeter slice thickness; – Discussion: – it is the most important view for identification of … Read more
– Discussion: – index finger is most commonly involved, often found in older pts w/degenerative arthritis; – Etiology: – muscular contracture or trauma; – collateral ligament or volar plate tethering on prominent MP head or osteophyte (on either side or volar aspect of metacarpal head); – torn palmar … Read more
– See: MP joint in RA – Planning: – indications: – irretrievable articular cartilage damage; – volar subluxation; – dislocation are indications for surgery; – cautions: – cervical spine … Read more
– See: Sensory latency – Discussion: – distal motor latency is the interval between the stimulus and the onset of the compound muscle action potential (CMAP) in the thenar muscles; – a motor conduction latency of more than 4.0 msec is significant; – incremental change of 0.4 msec in the … Read more
– Discussion: – most common pattern of motor branch of median nerve is extraligamentous take off from main branch of median nerve (distal to TCL in 50% pts) – in 30% of pts motor branch exits proximal to TLC; – in 20% of pts motor branch exits distal to TLC; … Read more