Surgical simulation of curved periacetabular osteotomy in four types of developmental dysplasia of the hip using finite element analysis and identification of the optimal rotation angle of the osteotomized bone.

Background: Patients with developmental dysplasia of the hip (DDH) undergo curved periacetabular osteotomy (CPO) to prevent progressive osteoarthritis. The acetabulum's morphology varies with in each DDH type. Therefore, developing a three-dimensional preoperative plan is important in CPO.

Total hip arthroplasty after failed transtrochanteric rotational osteotomy for osteonecrosis of the femoral head: analysis of three-dimensional morphological features.

Background: In total hip arthroplasty (THA) after failed transtrochanteric rotational osteotomy (TRO) for osteonecrosis of the femoral head (ONFH), deformity of the proximal femur has been reported to affect stem placement. The aims of this study were to evaluate the morphological changes in the proximal femur, muscle atrophy, and soft tissue thickening in THA after TRO and the clinical outcomes.

Methods: The TRO group included 17 patients (18 hips) who underwent THA after failed TRO.

A teenage boy with acute myocarditis and reversible microvascular angina: A case report.

Unlabelled: A 17-year-old male was diagnosed with acute myocarditis based on the presence of CD3-positive T-lymphocytes in myocardial biopsy, normal coronary angiography, and focal increase in late gadolinium enhancement, T2 intensity and native T1 value. On day 2, the patient suffered from recurrence of chest pain with new ST segment elevations on electrocardiogram. A transient metabolic alteration (inversed lactate level of the coronary sinus relative to that of the coronary artery) accompanied by chest pain and electrocardiographic changes without epicardial coronary spasm in acetylcholine provocation test led to the diagnosis of microvascular angina, which is characterized by a transient myocardial ischemia secondary to a dysfunction of the resistance coronary vessels (<500 μm) that, because of their small size, are not visualized at coronary angiography.