Ortho Oracle - orthopaedic operative atlas

Odontoid View

  – Discussion:     – to evaluate C1 (Jefferson), Dens, superior facets of C2;     – for evaluating dens fractures, body of C2, & rotary C1-C2 dislocations;     – mach lines – teeth, C1 arch;     – open mouth view, along w/ lateral view, will reveal fractures of the dens ; … Read more

Ofloxacin / Floxin

– Dosing:     – usual dose is 200 mg to 400 mg q 12 hr;     – 30-40% of drug will be excreted in to urine;     – there is some evidence for higher tissue concentrations than seen with other antibiotics, and with a 800 mg dose the tissue concentrations are at … Read more

Olecranon Osteotomy

– Discussion:     – used in conjunction w/ a posterior approach: for fixation of condylar fractures, as well as exposure of distal humeral non unions;     – olecranon osteotomy can be either non-articularl or trans-articular;            – usually the non-articular olecranon osteotomy is used for non-articular condylar fractures;     … Read more

Olecranon Pins

   – are placed on the medial (ulnar) side to avoid damaging the ulnar nerve;    – elbow in 90 deg of flexion;    – entry site is 1 1/2″ from the distal end of the olecranon

Obturator Artery

– Discussion:     – artery arises from the internal iliac artery in the pelvis;            – in the pelvis, it sends a branch to the obturator internus muscle;     – as vessels emerge from obturator canal, they divide into anterior and posterior branches that, instead of continuing down thigh, circle            … Read more

Obturator Externus

  Origin:        the margin of bone immediately around the medial side of the obturator foramen, from the rami of the pubis and the inferior ramus of the ischium;   Insertion: posterior aspect of the greater trochanter; Action: External Rotation of femur at the hip; (see external rotators) Synergists: Periformis, Gemellus Superior, Gemellus Inferior, Obturator … Read more

Obturator Internus

  – See: External Hip Rotators; – Anatomy:     – origin: inferior medial surface of the obturator foramen and the quadrilateral surface;     – insertion: after passing thru the lesser sciatic notch, it inserts on the superior posterior aspect of the greater trochanter of the femur;      – action: outward rotation of the … Read more

Obturator Nerve

– Anatomy:     – formed from anterior branches of L2, L3, L4 (see innervation of muscles of the lower limb)     – largest nerve formed from anterior divisons of  lumbar plexus ;     – roots unite within the posterior part of psoas, & then descends thru psoas & runs downward over sacral … Read more