Ortho Oracle - orthopaedic operative atlas

Motor Conduction Latency

– 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

MP Joint Locking

– 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

Monteggia’s Fracture

  – See: – Plating Techniques – Monteggia Fractures in Children – Discussion: – Giovanni Monteggia (1814) first described frx of proximal 1/3 of ulna in association w/ anterior dislocation of radial head; – hence dislocation of radial head w/ frx of proximal 1/3 of ulna is known as Monteggia’s deformity. – Mechanism: – proposed … Read more

Morphine Sulfate

– Discussion:     – adult:           – 0.1-0.3 mg/kg/dose IM/IV/SC           – 8-20mg PO q4hr, 30mg (MS Contin) PO q8-12 hr / 5-15 mg SQ/IM q4hr           – IM/SC: Max. analgesic effect at 45-60 min; duration 3-4 hrs; t/2: 2-3 hr;   … Read more

Morquio’s Syndrome

Discussion short trunk disproportionate dwarfism is established by age of 2 or 3 and progresses; inherited as autosomal recessive trait; children have normal intelligence and survive well into adulthood; pectus carinatum is also apparant; other problems include corneal opacity and abnormal dentition; type of mucopolysaccharidoses in which keratan sulfate accumulates in the tissues; measurement of … Read more

Morselized Allograft Graft

– see:  structural bone grafts: – Discussion:      – can be used to help recreate bone stock w/ protrusio, cavitary, or medial wall deficiency;      – cannot be expected to provide ingrowth or stability, but over time the morselized graft can undergo revascularization and remodeling;      – antiprotrusio cage or gap cup can be placed over the … Read more

Mortise views

  – Evaluate for: – lateral talar shift: – medial clear space – deltoid injury – fibular shortening; – talocrural angle – tibiofibular line – fibular rotation, or lateral displacement; – tibiofibular line – syndesmotic integrity (see radiographs) – talar tilt: (stability) – osteochondral lesions of talus – Discussion: – fibular length, talar tilt, talar … Read more

Modified McBride Procedure for Hallux Valgus

– Discussion: – modified procedure includes release of adductor hallucis, transverse metatarsal ligament, and lateral capsule combined w/ excision of medial eminence and plication of the capsule medially; – this procedure was modified to retain the lateral sesamoid, which helps to prevent hallux varus (which as common w/ original Mcbride bunionectomy); – as this procedure attempts to … Read more