Publications by authors named "Keiji Otaka"
Purpose: The Japanese Investigation Committee (JIC) classification for osteonecrosis of the femoral head (ONFH) is based on the necrotic area relative to the weight-bearing surface on anteroposterior (AP) radiographs or central coronal MRI. Discrepancies exist between these methods, potentially related to the AP necrosis area. This study evaluated these discrepancies and the extent of AP necrotic lesions.
View Article and Find Full Text PDFAim: Advanced glycation end-products (AGEs) are irreversibly and heterogeneously formed compounds during the non-enzymatic modification of macromolecules, such as proteins. Aging and lifestyle habits, such as high-fat and high-protein diets, and smoking, promote AGEs accumulation. This study aimed to investigate the relationship between fall risk and AGEs in community-dwelling older adults.
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- - The study focuses on the importance of muscle quality, measured by CT imaging, over muscle mass when assessing physical function in patients with hip osteoarthritis (HOA) undergoing total hip arthroplasty (THA).
- - Researchers analyzed the impact of mid-thigh quadriceps cross-sectional area (CSA) and CT attenuation values (CTV) on preoperative and postoperative functional scores in 62 HOA patients.
- - Results showed that while muscle CSA did not correlate with functional scores, higher muscle quality (CTV) was linked to better postoperative outcomes, emphasizing the relevance of muscle quality in recovery.
It is often difficult to achieve adequate bone coverage of the cup in total hip arthroplasty in cases of severe developmental dysplasia of the hip (DDH). This study aimed to evaluate the relationship between subluxation percentage of Crowe classification and cup center-edge (cup-CE) angle to investigate whether subluxation percentage according to the Crowe classification is a useful indicator for cementless cup placement. Cementless cup placement was simulated in 77 women with DDH in 91 hips (Crowe I, 35 hips; Crowe II, 35 hips; and Crowe III, 21 hips) using computed tomography-based computer simulation software.
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- Joint-preserving treatments, like intertrochanteric curved varus osteotomy (CVO), are preferred over total hip arthroplasty for young patients with subchondral fracture of the femoral head (SFF) due to better outcomes.
- A study involving four young male patients showed significant improvement in pain and hip function after CVO, with their Harris hip scores rising from an average of 67.3 to 99.5 post-surgery.
- The procedure effectively increased the weight-bearing intact ratio of the femoral head from 12.3% to 44.3%, without any progression to femoral head collapse or joint space narrowing observed in follow-up assessments.