Naohide Takeuchi

Publications (3)0.84 Total impact

• Article: A Gustilo type IIIB open forearm fracture treated by negative pressure wound therapy and locking compression plates: a case report.

  Naohide Takeuchi, Takao Mae, Shunsuke Hotokezaka, Kosuke Sasaki, Akinobu Matsushita, Go Miake, Rintaro Kuchiishi, Yasuo Noguchi
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  ABSTRACT: A 91-year-old female sustained injuries to her left forearm while walking across a crosswalk. X-rays showed left radial shaft and ulna shaft fractures, and the injury was a type IIIB open fracture. On the day of admission, irrigation and debridement of the open wound, and temporary fixation of the radius and ulna using an external fixator and a Kirschner wire were peformed. Six days after the surgery, we used negative pressure wound therapy (NPWT) using the V.A.C.ATS system for the open wound. Thirteen days after the first surgery, definitive fixation was performed by using locking compression plates, and full thickness skin grafting was undertaken for the open wound. NPWT is a treatment that accelerates the wound healing process through the delivery of continuous subatmospheric pressure within a closed environment. In our case, we could reduce the healing period of the soft tissue and could convert to the definitive fixation in a timely fashion. NPWT is thought to be a useful adjunct in the management of the soft tissues of open fractures.
  Fukuoka igaku zasshi = Hukuoka acta medica 10/2011; 102(10):293-7.
• Article: The orientation of orthopaedic metallic devices relative to the frequency-encoding gradient affects susceptibility artifacts: an experiment using open MR imaging.

  Naohide Takeuchi, Hiromichi Mitsuyasu, Tomonori Nakanishi, Sumako Nishimura, Takeshi Shimoto, Hidehiko Higaki, Makoto Hashizume, Yukihide Iwamoto
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  ABSTRACT: To evaluate the magnetic susceptibility artifacts associated with different frequency-encoding gradient directions for an angled cephalomedullary device of the proximal femur, and to determine the optimal extremity positioning for reducing artifacts using 0.4 T open MR imaging. Two different angular devices made of titanium alloy and stainless steel were used. The images were obtained with the frequency-encoding gradient parallel to the rod (Group R) and parallel to the lag screw (Group L). The device positioning was altered in order to obtain images with frequency-encoding gradient parallel to the rod and parallel to the lag screw. The artifact areas associated with the whole device and the lag screw were statistically evaluated. For both devices, the mean artifact area in Group L was significantly larger than that in Group R (p<0.05). However, the mean artifact area of the lag screw only in Group L was significantly smaller than that in Group R (p<0.05). Susceptibility artifacts for angled cephalomedullary devices can be minimized when the frequency-encoding gradient is parallel to the long axis of the regions of interest. Open MR imaging enables us to obtain the optimal orientation for minimizing susceptibility artifacts.
  Fukuoka igaku zasshi = Hukuoka acta medica 05/2011; 102(5):185-94.
• Article: Asymmetry of mediolateral laxity of the normal knee.

  Ken Okazaki, Hiromasa Miura, Shuichi Matsuda, Naohide Takeuchi, Taro Mawatari, Makoto Hashizume, Yukihide Iwamoto
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  ABSTRACT: Understanding the normal kinematics of the joints is important for reconstructive surgery. However, only a few extensive studies have been done on medial and lateral laxity of the normal knee. Radiographs of 50 normal knees were obtained under varus and valgus stress in both extension and flexion and the relative angle of the articular surface was measured. In extension, the mean angle was 4.9 degrees in varus stress and 2.4 degrees in valgus stress. In flexion, the mean angle was 4.8 degrees in varus stress and 1.7 degrees in valgus stress. Lateral laxity was significantly greater than medial laxity in both extension and flexion. Lateral laxity may be necessary for the medial pivot movement of the normal knee. There is some disagreement regarding the importance of pursuing the perfect rectangular gaps during total knee arthroplasty (TKA). The methods for measuring the tension of soft tissues during the operation are not accurate and do not always reflect the postoperative tensions of dynamic phases, such as walking and standing. Slight lateral laxity can be accepted with TKA, and further studies are necessary to determine whether prosthesis lift-off occurs in the replaced knee with slight lateral laxity similar to that in the normal knee.
  Journal of Orthopaedic Science 06/2006; 11(3):264-6. · 0.84 Impact Factor