Ortho Oracle - orthopaedic operative atlas

Lapidus Procedure

– Discussion: – Lapidus procedure is indicated for w/ severe hallux valgus deformity +  a hypermobile 1st ray; – procedure involves: arthrodesis of metatarsalcuneiform joint – note that shortening of metatarsal will occur if large biplanar wedge is resected from the joint; – therefore, minimal cartilage resection is optimal technique; – incidence of pseudoarthrosis is … Read more

LACTULOSE/CHRONULAC

– Discussion:  – for hepaticencephalopathy;  – laxitive;  – may cause severe diarrhea;  – Adult: acute hep enceph:  – 30-45ml/dose q 1hr until get loose stool;  – Chronic laxative:  – 30-45ml PO tid/qid for 1-2days to make 2-3 soft BM;  – Peds: Infants: 2.5-10 ml/24 hr divided tid/qid; Children: 40-90ml/24hr divided tid/qid;  – Supplied: Syrup 10 … Read more

Lag Screw for Weber B Frx

– Discussion:     – see: lag screw theory:     – when the fibular fracture is sufficiently oblique, is not comminuted, and is not osteoporotic, then sufficient fixation can be achieved w/ only two lag screws;            – the oblique fracture should be longer than 2x diameter of bone inorder for … Read more

Lag Screw Theory

– See: Screw Menu – Discussion:     – involves placement of one or more screws across a frx or osteotomy site to achieve interfragmentary compression;     – note that the direction along which the compression acts (inclination of lag screw) must coincide well w/ perpendicular            axis of the fracture surface;      … Read more

Laminaplasty

– See:       – Cervical Stenosis:       – Central Cord Syndrome       – Soft Disc Protrusion:       – Cervical Spondylosis” – Discussion:      – increases the space available for the cord thru posterior approach:;      – results in less damage to facet joints;     … Read more

Lactate Dehydrogenase (LDH) 45-100 U/L

– Increased  – Acute MI, Cardiac Surgery, Prosthetic valve;  – Hepatitis  – Pernicious Anemia  – Malignant Tumor  – PE  – Hemolysis (Anemia – factitious)  – Renal infarction  – Muscle Injury;  – LDH IsoEnzymes (LDH 1-5);  – Normally ratio LDH 1/LDH 2 = 0.6-0.7;  – If the ratio becomes >1, suspect a recent MI; w/ Acute … Read more

Lactic Acidosis

– See: Metabolic Acidosis  – Discussion:     – develops during shock when there is inadequate cellular perfusion & cellular hypoxia;     – caused by accumulation of lactate and hydrogen ions (protons), but extent of acidosis, as defined by pH, and the concentration of lactate required                     for diagnosis of lactic acidosis is controversial;   … Read more

Lactobacillus/Lactinex Granules

– for control of diarrhea after Antibiotics treatment;  – replaces normal intestinal flora;  – Adult: 1 packet, 2 capsules, or 4 tabs with meals and fluids tid;  – Peds: >3yrs: same as adults

Laboratory Studies for Gout

 – Hyperuricemia:          – biochemical hallmark of gout is hyperuricemia, but not by itself diagnostic for gout;          – also note that the uric acid level can flucuate over wide levels over short periods of time (dont assume that a normal uric acid level                 from 2 days ago represents a constant … Read more