MED SURG 2 EXAM 1 STUDY NOTES

UNIT TOPIC TB CHAPTER Unit 9: Musculoskeletal Function Assessment of Musculoskeletal Function 39 ATI CHAPTER 67-72 Pharm: 34,45 Musculoskeletal Care Modalities 40 Management of Patients w/ Musculoskeletal Disorders 41 Management of Patients w/ Musculoskeletal Trauma 42 Unit 3: Concepts & Challenges in Patient Management Shock & Multiple Organ Dysfunction Syndrome 14 37 CHAPTER 39: ASSESSMENT OF MUSCULOSKELETAL FUNCTION Anatomic & Physiologic Overview Downloaded by Morris Muthii () Structure & Function of the Skeletal System ● 206 bones divided into 4 categories: long, short, flat, irregular - Long bones: found in upper & lower extremities (e.g. femur). Rod shaped or shafts w/ rounded ends - - - Short bones: irregularly shaped located in ankle & hand (e.g. metacarpals, phalanges) Flat bones: extensive protection of underlying structures (e.g. sternum, skull) Irregular bones: cannot be categorized (e.g. vertebrae & jaw bones) ● Cortical bone (compact bone) exists where support is needed & cancellous bone (lattice like bone structure; trabecular bone) is found where hematopoiesis & bone formation occur. ● Bones composed of cells, protein matrix, and mineral deposits. 3 cells include: - Osteoblasts: bone-forming cell; secretes bone matrix - - Osteocytes: mature bone cell for bone maintenance; located in lacunae Osteoclasts: located in shallow Howship’s lacunae. Multinuclear cells that destroy, resorb, & remodel bone. ● Joint: where bone ends meet; provides for motion & flexibility Bone Formation & Maintenance ● Osteogenesis: process of bone formation ● Ossification: process of formation of the bone matrix & deposition of minerals. ● Bone is a dynamic tissue in a constant state of turnover. - During childhood & adolescent years, new bone is added faster than old bone is removed. - - - - Continues until peak bone mass is reached (20 y/o) Complete skeletal turnover occurs every 10 years Balance between bone resorption & formation influenced by: exercise, diet (calcium), hormones (calcitriol, parathyroid hormone, cortisol, growth hormone, sex hormones) Weight-bearing activity supports bone maintenance; any activity done while person is on their feet that works bones & muscles against gravity (e.g. walking, tennis) ● Daily intake of 1,200 mg calcium essential to maintain adult bone mass - Calcium sources: low-fat milk, yogurt, cheese, OJ, cereals, bread ● Young adults need vitamin D intake of 600 IU & adults 50 y/o+ need daily intake of 800-1000 IU - Vitamin D sources: fortified milk, cereals, egg yolks, saltwater fish, liver ● Calcitriol increases blood calcium by promoting calcium absorption from GI tract & facilitates mineralization of osteoid tissue. ● PTH & calcitonin regulates calcium concentration in blood. - Increased PTH prompts calcium mobilization - - Calcitonin inhibits bone resorption & increases calcium deposit into bone SQ/ IM/ IN administration. Watch for bloody nose. Alternate nostrils ● Excessive thyroid hormone & cortisol production can result in increased bone resorption & decreased bone formation ● Long-term cortisol or corticosteroid therapy increases risk for osteopenia & fractures Bone Healing ● Stage 1: Hematoma formation: 1-2 days after fracture. Bleeding & local vasoconstriction. Hematoma forms at fracture site. Cytokines released, initiating fracture healing process (fibroblast Downloaded by Morris Muthii () proliferation causing angiogenesis to occur) ● Stage 2: Fibrocartilaginous callus formation: granulation tissue formation. Fibroblasts & osteoblasts migrate to fracture site & begin bone reconstruction ● Stage 3: Bony callus formation (Ossification): 3-4th week of fracture. Continues until a firm bony union is formed. Mature bone gradually replaces fibrocartilaginous callus & excess callus reabsorbed by osteoclasts. Fracture site feels immovable. Safe to remove cast. ● Stage 4: Remodeling: osteoclasts remove necrotic tissue. May take months to years. Functions of the Musculoskeletal System ● Protection of vital organs ● Framework to support body structures, mobility ● Movement; produce heat & maintain body temperature ● Facilitate return of blood to the heart ● Reservoir for immature blood cells ● Reservoir for vital minerals Structure & Function of the Articular System ● Synarthrosis: immovable joints ● Amphiarthrosis: allow limited movement (e.g. vertebrae or symphysis pubis) ● Diarthrosis: freely movable - Ball & socket: permit full freedom of movement (e.g. hip, shoulder) - - - - Hinge joints: permit bending in one direction via flexion/ extension (e.g. elbow, knee) Saddle joints: allow movement in 2 planes at right angles. Joint at base of thumb is saddle (biaxial joint) Pivot joints: allow one bone to move around central axis (e.g. articulation between radius & ulna) Gliding joints: allows limited movement in all directions (e.g. wrist carpal bones) ● Joint capsule: tough fibrous sheath surrounds articulating bones ● Ligaments: ropelike bundles of collagen fibrils bind articulating bones together ● Tendons: cords of fibrous tissue that connect muscle to bone ● Bursa sac: filed w/ synovial fluid that cushions movement of tendons, ligaments, & bones Muscles ● Composed of parallel groups of cells (fasciculi) encased in fascia. More fasciculi in muscle, more precise movements are ● Sarcomere: contractile unit of skeletal muscle that contains actin & myosin ● Contraction of muscle fibers result in isotonic or isometric contraction: - Isometric contraction: length of muscles remains constant but force generated by muscles is increased (e.g. pushing against wall) - - - Isotonic contraction: shortening of muscle w/o tension increase (e.g. forearm flexion) During sedentary activity, ATP is synthesized from oxidation of glucose to water & Co2 During strenuous activity, glucose is metabolised to lactic acid. Stored muscle glycogen used to supply glucose via anaerobic pathways ● Tendons connect muscle to bone & ligaments connect bone to bone Muscle Maintenance ● Muscle tone - Flaccid: limp & w/o tone - Spastic: muscle w/ greater-than-normal tone Downloaded by Morris Muthii () Atonic: soft & flabby - - - Upper motor neuron lesions produces increased tone (e.g. cerebral palsy) Lower motor neuron lesions produces decreased tone (e.g. muscular dystrophy) ● Hypertrophy: muscle repeatedly develops maximum tension over long time, causing cross- sectional area & muscle fiber size to increase ● Atrophy: decrease in muscle size Assessment of the Musculoskeletal System ● Health Hx - Rest relieves most musculoskeletal pain - - - - - - - - - Pain that increases w/ activity may indicate joint sprain, muscle strain, or compartment syndrome Steadily increasing pain may indicate progression of infectious process (e.g. osteomyelitis, malignant tumor, neurovascular complications) Rheumatic dx & tendonitis pain usually occurs in morning whereas osteoarthritis worsens as day progresses Rheumatoid arthritis: ulnar deviation of fingers & swan neck deformity: hyperextension of proximal interphalangeal joints w/ flexion of distal interphalangeal joints. Bilateral. Pain at rest. Increased pain in morning. Osteoarthritis: pain w/ activity & improves w/ rest. Heberden nodules are classic sign. Crackles. Osteoarthritis Risk Factors: female, smoker, ages, genetics, med use Treatment: NSAIDs, glucosamine, tylenol, injections into knees Rhabdomyolysis: the death of muscle fibers and release of their contents into the bloodstream, which causes renal (kidney) failure & concentrated urine. Paresthesias: sensations of burning, tingling, or numbness ● Physical Assessment - Normal curvature of spine is convex through thoracic portion & concave through cervical & lumbar portions - - - - - - - - Kyphosis: Humpback. Increased forward curvature of thoracic spine that causes bowing or rounding of back, leading to hunchback or slouching posture Lordosis: lumbar curvature. Swayback, exaggerated curvature of lumbar spine (common causes: pregnancy, excessive visceral fat) Scoliosis: lateral curvature deviation of spine Examiner inspects spinal curves & trunk symmetry by standing behind pt & instructs pt to bend backward supporting pt by placing hands on posterior iliac spine Effusion: excessive fluid within capsule; swelling & increased temperature that may reflect inflammation Balloon sign: milk downward, apply medial pressure, tap & watch for fluid wave. Feel for fluid entering space directly below patella. Ballottement sign: medial & lateral aspects of extended knee milked firmly in downward motion. Push patella toward femur & observes for fluid return to region superior to patella. Fasciculation: involuntary twitching of muscle fiber groups ● Neurovascular Status - Compartment syndrome (caused by pressure within muscle compartment that increases until microcirculation diminishes, leading to nerve & muscle anoxia & necrosis). Function cab be lost if anoxic situation continues 6 hrs Diagnostic Evaluation ● X- Ray studies: determine bone density, texture, erosion, & changes in bone relationships. ● CT: shows detailed cross-sectional image of body to visualize & assess tumors; injury to soft tissue, ligaments, or tendons, & severe trauma. Identifies location & extent of fractures ● MRI: uses magnetic fields & radio waves to create high-resolution pics of bones & soft tissues to