Data Trace Editor – Discussion: – radionuclide imaging was performed 2-3 hours after administration of technetium-99m methylene diphosphonate, 4 days after injury; – false-positive rate: 6-16% – false-negative rate: 0% Can a day 4 bone scan accurately determine the presence or absence of scaphoid fracture?
– See: – General Discussion of Bone Scans: – Bone Scans in THR: – Discussion: – evaluation of of porous coated prosthesis may require a different interpretation from cemented THR; – bone & fibrous tissue ingrowth into porous acetabular & intertrochanteric surfaces may cause findings unrelated to complications; – with loosening there is … Read more
– See: Total Hip Replacement Menu: – General Discussion of Bone Scans: – Normal THR: – normal study (minimal reative bone formation) may be expected from months to a year after placement; – area of lesser trochanter to midshaft of prosthesis usually becomes normal in about … Read more
Discussion for detection of AVN, technetium-99 methylene-diphosphonate bone-scanning is a useful technique; bone-scanning may be less sensitive in the detection of AVN at early stage of the disease or when both hips are involved symmetrically; reactive of bone at the edge of the infarcted segment will show an increased uptake of the isotope on the … Read more
– See: Bone Topics – Discussion: – woven bone healing: – ref: Distal radial fractures heal by direct woven bone formation – stages of enchondral bone healing: – hematoma / inflammation: – shortest stage of fracture healing – disruption of vascular flow through the marrow and periosteum … Read more
– Discussion: – see fracture healing menu and plate biomechanics menu and bone healing with locking plates – where bone is under compression w/ no gap, dead bone is reabsorbed, & resorption cavities, produced by cutting cones of osteoclasts, traverse the fracture plane; – clinically the ideal result of rigid plating should … Read more
– Discussion: – bone marrow signal on T1- and T2 vary with age – in adults, tumor invading bone marrow will show decreased signal on T1, in contrast to normally high signal-intensity bone marrow; – its imporant to note that traumatic, inflammatory, and neoplastic disorders will … Read more
– Discussion: – generalized pathologic processes in bone can be best understood by understanding how these processes alter the normal sequence of bone remodeling as described in the previous chapter; – bone remodeling occurs in local groups of osteoblasts and osteoclasts called bone multicellular units (BMU); – each unit … Read more
– See: – Bone Patella Bone Allografts – Non Bone Patella Bone Reconstruction – Discussion: – Anatomy of ACL; – ACL Biomechanics; – Graft Tunnel Sites / Isometry: – Graft Biomechical Characteristics: – … Read more
– See: Scaphoid Frx Menu: – scaphoid nonunions: – Discusssion: – bone grafting may be indicated for scaphoid malunion or non union; – malunion: – indicators of scaphoid malunion: classic findings are a dorsal humpback deformity and DISI deformity; – indications for bone grafting include radiographic deformity along with pain, weakness, and loss … Read more