Ortho Oracle - orthopaedic operative atlas

Lorazepam/Ativan

– for anxiety and depression; preanesthetic medication, sedation, status epilepticus; Adult: 1-10mg/24hr PO bid/tid; – Anxiety: 1mg PO bid/tid; – Preop: 0.05mg/kg up to max 4mg IM at least 2hr prior to surgery; – The only benzo which can be reliably injected IM; Sedation and relief of anxiety:    – 0.44mg/kg (max of 2 mg) given … Read more

Losee Test

– See:   – Pivot shift   – Anterior Cruciate Ligament   – Anterolateral Rotatory Instability   – Clunk Test   – Diagram   – Lachman   – Losee Test   – reverse pivot shift Test – Discussion:  – begins w/ the knee in flexion as an external rotation & valgus force are applied;  – … Read more

Lovastatin/Mevacor

– Discussion:  – for reduction of elevated total & LDL cholesterol levels in pts w/ primary hypercholesterolemia; – Inhibits early step in cholesterol synthesis;  – Adults:  – 20 mg PO daily w/ evening meal;  – may increase at 4 week intervals to max dose of 80 mg/day taken w/ meals;  – Precaution:  – monitor LFTs … Read more

Longitudinal Growth

– See:       – Limb Development       – Pediatric Bone Circulation       – Salter Harris       – Epiphyseal Physis: – Discussion:     – longitudinal growth depends on both proliferation and hypertrophy of chondrocytes in the growth plate;     – longitudinal growth of bone is complicated … Read more

Longitudinal Meniscal Tear

  – longitudinal tears, which usually involve the posterior portion of the meniscus, are the most common meniscal lesions;   – in many cases, gross inspection reveals only slight irregularities in inner border of the meniscus;   – probing is necessary to establish the presence of a tear;   – the meniscus should be probed from its … Read more

Longitudinal Stress Injuries of Midtarsal Joint

– Discussion:     – usually severe mid-tarsal injury w/ a high incidence of assoc frx;     – these injuries occur w/ foot in varying degrees of plantarflexion, w/ force being applied to metatarsal heads & transmitted proximally along rays to disrupt midtarsal joint and frx of cuboid or navicular;     – w/ … Read more

Longus Capitis

origin: anterior tubercles of transverse processes of the 3rd to 6th cervical vertebrae; insertion: inferior surfaces of the basilar portion of the occipital. action:    – acting bilaterally, flexes cervical vertebrae and head;    – acting unilaterally, rotates and flexes cervical vertebrae and head to the same side; nerve supply: muscular branches of C1, C2, … Read more

Locking Plates: General Concepts

– Locking Plates: LCP Locking Compression Plate.         – locking screws makes plate fixation more resistant to failure from screw loosening and pullout;         – for failure to occur, a locking screw construct will fail as a unit as opposed to sequential screw failure with non locking plates;         – far cortical locking:                – … Read more

Long Thoracic Nerve

– Discussion: – long thoracic nerve is derived from ventral rami of C5, C6, & C7 – close to their emergence from intervertebral foramina; – it runs downward & pases either in front of or behind middle scalene muscle; – it reaches upper slip of serratius anterior muscle & descends on outer surface of this … Read more

Longissimus Capitis

origin: transverse processes of the 1st to 5th thoracic vertebrae and the articular processes of the 4th to 7th cervical vertebrae; insertion: the posterior margin of the mastoid process; action: acting bilaterally, extends and hyperextends head; acting unilaterally, flexes and rotates the head the same side; synergists:    Semispinalis capitis , spinalis capitis,  Longissimus Cervicis