– a series of pairs of muscles of small muscles extending the full length of the spine just superficial to the rotators and each spanning 2 or 3 intervertebral spaces before inserting; origin: posterior surface of the sacrum, the dorsal end of the iliac crest, the transverse processes of the lumbar and the thoracic vertebrae and the … Read more
– Discussion: – originally was described by Ollier in late 1800s; – characterized by multiple enchondroma lesions primarily located w/ in the metaphyseal regions of tubular bones; – usually diagnosed in childhood; – pts w/ Ollier’s dz have increased risk of a secondary chondrosarcoma developing later in … Read more
– See: Hand Tumors – Discussion: – cystic lesion (actually a ganglion) over dorsum of finger near DIP & fingernail; – it is associated w/ degenerative lesions and spur formation (Heberden’s nodes) over DIP joint; – ganglion may or may not be connected to DIP joint by a synovial stalk; … Read more
– Discussion: – multidirectional instability implies three-way subluxations or dislocations either anteriorly, posteriorly, or inferiorly; – these patients usually have no true Bankart lesion and incontrast patients have a capacious axillary pouch; – ref: The Effect of Variation in Definition on the Diagnosis of Multidirectional Instability of the Shoulder. – … Read more
ORIF of Calcaneal Frx Using Lateral Approach: – Preoperative Planning: – Surgical Stratedgy: – pt in true lateral position – J or L approach w/ subperiosteal dissection off lateral wall, including calcaneo-fibular ligament (sural nerve in flap); – extension from tuberosity to calcaneo-cuboid (watch peroneals) – reduction of critical angle of Gissane/ anterior process to … Read more
– Discussion: – T1 images w/ short TR & w/ short TE will provide the best anatomic detail; – T1 imaging is most useful for lesions involving marrow & subQ fat; – T1-weighted imaging also provides the highest signal-to-noise ratio and is therefore optimal for evaluating … Read more
– Discussion: – T2 images have a long TR & long TE; – used to distinguish normal from abnormal soft tissues; – tissues w/ short T2 values include ca (cortical bone), ligaments & tendons; – tissues w/ long T2 values include neoplasms, inflammation, … Read more
– See: Steroid Menu – Discussion: – daily doses of more than 5 to 7.5 mg of prednisone or its equivalent should be avoided because of side effects produced by glucocorticoids, esp diminishing of bone mineral content; – low dose (5 to 7.5 mg PO qd) may benefit certain pts … Read more
– Discussion: – useful in planning surgery & limb salvage procedures; – assists w/ preop planning for relationship of tumor to such adjacent normal structures as physes, joints, & N/V bundles; – Soft Tissue Tumors: – specificity of MRI is poor; – for planning limb salvage prosthesis, … Read more
– Discussion: – used to assess impingement syndromes (coronal oblique views) and less often glenoid pathology (transaxial views); – it accurately identifes full-thickness rotator cuff tears; – defects show up with high signal intensity traversing supraspinatus tendon on T2 images; – … Read more