Data Trace Editor – See: – abnormalities associated w/ vit D – general discussion of vit D – Discussion: – action of l,25-vitamin D3 is to increase absorption of Ca from intestinal tract; – 1,25 Vit D is known mediator of bone resorption thru indirect action on osteoclasts; … Read more
– Discussion: – muscle contraction is regulated by calcium ions, which will change thin filament into an activated state by binding to troponin; – release of calcium actives the myosin-ATP complex, which motors the sliding action between actin and myosin; – in absence of calcium, troponin & tropomyosin interfere … Read more
– See Vit D Discussion: – Discussion: – calcium requirements: – age 1 – 10: 800-1000 mg per day; – age 11 – 35: 1200 mg per day; – premenopausal: 1000 mg per day; – postmenopausal: 1500 mg per day; … Read more
– Discussion: – calcaneovalgus (congenital calcaneovalgus) refers to flexible flatfoot in infants and young children; – frequently seen infant foot disorder w/ forefoot abducted and the ankle severely dorsiflexed; – mild form may be seen in upto 30% of infants but a more severe form is … Read more
– Discussion: – frx results from multiple compressive loads in wt-bearing activities; – most often seen in military recruits; – symptoms include pain and swelling on both sides of heel and exquisite tenderness to palpation on the lateral & medial aspects of the heel; – diff dx … Read more
– Discussion: – dense vertically oriented bone that originates in posteromedial portion of femoral shaft under lesser trochanter; – it radiates laterally toward posterior aspect of greater trochanter; – it reinforces the femoral neck posteroinferiorly; – calcar femorale fuses w/ posterior aspect of femoral … Read more
– Discussion: – windshield wiper effect (distal toggle); – this really only happens w/ non cemented component with large collar; – distal portion of the stem loosens and begins to pivot around collar; – frequently seen w/ Moore prosthesis that does not fill medullary canal; … Read more
– See: Rotator Cuff Tear – Discussion: – deposits lie in the rotator cuff and contain H[2O, CO[3, & PO[4]; – usually does not occur until 4 th decade; – diabetic patients are more likely to develop asymptomatic rotator cuff calcium deposits; … Read more
– Discussion: – may be secondary to degeneration; – symptoms include pain, tenderness, and erythema; – treatment includes heat, rest, injections/aspirations, and surgery for larger deposits; – calcinosis circumscripta occurs in SLE, RA, and scleroderma, usually in fingers, & may be assoc w/ Raynaud’s phenomenon; – Calcification in a … Read more