Publications by authors named "Ryuichiro Okuda"

Introduction: Femoral nerve palsy and femoral artery injury are serious complications of total hip arthroplasty. However, few studies have compared the anatomical positions of these structures in different patient positions. This study aimed to compare the anatomical positions of the femoral nerve and artery in the lateral and supine positions.

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: The use of computed tomography (CT)-based navigation systems has been shown to improve surgical accuracy in total hip arthroplasty. However, there is limited literature available about the application of CT-based navigation systems in severe hip dysplasia. This study aimed to evaluate the accuracy of a CT-based navigation system in patients with severe hip dysplasia using three-dimensional (3D)-printed bone models.

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Introduction Implant technology for total hip arthroplasty (THA) was developed to improve hip function and patient satisfaction. Actis (DePuy Synthes, Warsaw, IN, USA) is a short fit-and-fill titanium stem, with a medial-collared and triple-taper (MCTT) geometry, that is fully coated with hydroxyapatite (HA). We evaluated the radiographic and clinical outcomes of the Actis Total Hip System during a mean follow-up of five years.

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Article Synopsis
  • Portable navigation systems, like the NAVBIT which uses table tilt registration, can improve accuracy in cup alignment during total hip arthroplasty (THA).
  • A study with 96 patients compared the accuracy of THA using NAVBIT in the lateral position (with the flip technique) versus a cup goniometer in supine or lateral positions.
  • Results showed that the NAVBIT's alignment accuracy (average differences of 2.1° and 2.0°) was significantly better than the cup goniometer’s (average differences of 3.4° and 5.0°), with a higher percentage of cases within 5° of target angles.
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Kounis syndrome is an acute coronary syndrome (ACS) caused by an allergic reaction that almost always occurs immediately and simultaneously with allergic symptoms. We present a case of Kounis syndrome type III that developed after complete resolution of contrast-induced anaphylaxis in a 60-year-old man with a coronary stent placed in the proximal left anterior descending (LAD) artery branch for ischemic heart disease. Contrast-enhanced computed tomography revealed anaphylactic shock.

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  • This study investigates the accuracy of placing percutaneous pedicle screws (PSS) during spinal surgery in two patient positions: lateral decubitus and prone.
  • A total of 265 patients with 1,816 screws were analyzed, and the rate of screw deviation was found to be similar between both positions, with 4.18% overall deviation.
  • While there was no significant difference in deviation rates, the study found that screws placed on the downside (in lateral decubitus) tended to deviate more laterally compared to those on the upside.
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Although there are some reports highlighting the applicability of double plates in distal femoral fractures, there is no standard approach or fixation method for supracondylar fractures combined with posterior coronal shear fractures. We report a case of distal femoral fracture treated with a lateral locking plate and posterior buttress plate using anterolateral and posterolateral approaches from one incision. A 70-year-old man was hit by a motorcycle and had an intra-articular distal femoral fracture involving a long medial proximal spike and a single lateral condyle fragment, with the lateral condyle fragment posteriorly displaced.

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Anteroposterior (AP) alignment assessment for nondisplaced femoral neck fractures is important for determining the treatment strategy and predicting postoperative outcomes. AP alignment is generally measured using the Garden alignment index (GAI). However, its reliability remains unknown.

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