Osteonecrosis in isolated fractures of the acetabulum without dislocation of hip seems to be a known complication, but to our knowledge it has not been reported adequately. The causative nature of post-traumatic femoral head osteonecrosis has not been studied critically. The pathophysiology of osteonecrosis in this case also eludes us. Striking evidence points towards the intra-operative blood ...

Osteonecrosis is a common disorder that may go clinically unrecognized or may result in the collapse of the architecture of bone, determining severe anatomic alterations of the involved site. Osteonecrosis is not a specific disease entity, but rather the result of a number of conditions ultimately leading to an impairment of blood supply to the bone tissue, although there is evidence that modif...

OBJECTIVES To clarify the initial onset time of osteonecrosis after the start of steroid treatment and its relation to the onset of abnormal lipid metabolism. METHODS Animal models were prepared by administering methylprednisolone to rabbits using five different steroid regimens. RESULTS A single, acute ischaemic event suggested by the frequency, size or number of necrotic foci within the p...

Osteonecrosis may complicate the course of systemic lupus erythematosus and may contemporaneously affect multiple joints. The major risk factor associated with the development of osteonecrosis is the use of glucocorticoid at high doses. Recent studies using serial MRI, which represents the "gold standard" for the early detection of osteonecrosis, yielded some interesting findings about the natu...

INTRODUCTION Osteonecrosis of the palate is a rare condition which is even rarer when occurring on a torus palatinus and associated with bisphosphonate (BP). CASE PRESENTATION We report an uncommon case of osteonecrosis of a torus palatinus. Our patient was a 67-year-old white female who presented with a painful intraoral ulcer associated with necrotic bone tissue of her torus palatinus, due ...

thy, characterized by severe joint destruction occurring within a few months, is ascribed to subchondral insufficiency fracture resulting from osteoporosis1 and ischemic hip disease.2 Corticosteroids can cause avascular osteonecrosis of the femoral head, osteoporosis, or both. Most cases of corticosteroid-induced osteonecrosis are caused by exogenous corticosteroid administered for the treatmen...

Nontraumatic osteonecrosis of the femoral head is still a challenging problem in orthopedic surgery. It is responsible for 10% of the 500,000 hip replacement surgeries in the USA and affects relatively young, active patients in particular. Main reasons for nontraumatic osteonecrosis are glucocorticoid use, alcoholism, thrombophilia, and hypofibrinolysis (Glueck et al., 1997; Orth and Anagnostak...

BACKGROUND AND PURPOSE Non-traumatic osteonecrosis is a progressive disease with multiple etiologies. It affects younger individuals more and more, often leading to total hip arthroplasty. We investigated whether there is a correlation between inducible nitric oxide synthase (iNOS) expression and osteocyte apoptosis in non-traumatic osteonecrosis. PATIENTS AND METHODS We collected and studied...

INTRODUCTION Osteonecrosis of the jaws can result either from radiation, used in radiotherapy for treatment of malignant tumors, or medications used for bone remodeling and anti-angiogenesis such as bisphosphonates. These conditions can be associated with triggering factors such as infection, trauma and decreased vascularity. The management of patients with osteonecrosis of the jaws requires ca...

Osteonecrosis is a severe glucocorticoid-induced complication of acute lymphoblastic leukemia treatment. We prospectively screened children (n = 364) with magnetic resonance imaging of hips and knees, regardless of symptoms; the cumulative incidence of any (grade 1-4) versus symptomatic (grade 2-4) osteonecrosis was 71.8% versus 17.6%, respectively. We investigated whether age, race, sex, acute...