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Articles by K Ogawa
Total Records ( 2 ) for K Ogawa
  K Nakamura , K Ogawa , T Sasaki , H Onishi , M Koizumi , M Araya , N Mukumoto , M Mitsumori , T Teshima and Japanese Patterns of Care Study Working Subgroup of Prostate Cancer

The purpose of this study is to identify the treatment planning process for Japanese patients with localized prostate cancer.


The Patterns of Care Study conducted a random survey of 61 institutions nationwide. Detailed information was collected on prostate cancer patients without distant metastases who were irradiated during the periods 2003–05. Radiation treatment planning and delivery were evaluated in 397 patients who were treated radically with external photon beam radiotherapy.


Computed tomography data were used for planning in ~90% of the patients. Contrast was rarely used for treatment planning. Simulations and treatments were performed in the supine position in almost all patients. Immobilization devices were used in only 15% of the patients. Verification of the treatment fields using portal films or electric portal imaging devices was performed in most of the patients. However, regular or multiple verifications in addition to initial treatment and/or portal volume changes were performed in only 30% of the patients. Typical beam arrangements for treatment of the prostate consisted of a four-field box. Three-dimensional conformal techniques were applied less frequently in non-academic hospitals than in academic ones. Modernized multileaf collimators with leaf widths ≤10 mm were used in about two-thirds of the patients. Although the total doses given to the prostate were affected by the leaf widths, there were no significant differences between leaf widths of 5 and 10 mm.


The results of the survey identified certain patterns in the current treatment planning and delivery processes for localized prostate cancer in Japan.

  K Ogawa , A Yoshida , H Matsumoto and T. Takeda

Background: The etiologic factors, time of development, and extent of the progression of postoperative osteoarthritis (OA) in traumatic shoulder instability remain controversial.

Hypothesis: Most OA seen postoperatively occurs before surgery and progresses very slowly.

Study Design: Cohort study; Level of evidence, 3.

Methods: Review of 167 joints of 163 patients undergoing the open Bankart procedure, who had no history of shoulder surgery and were younger than 45 years at follow-up, was done at a mean follow-up of 8.7 years (range, 5-20 years). The shoulders were directly examined and radiographed. A statistical analysis was performed to examine the correlation between OA development/progression and patients’ demographic characteristics and various factors, and to evaluate the correlation between these factors.

Results: Recurrence of instability occurred in 8 of 167 joints (4.8%). Preoperative computed tomography (CT) showed OA in 44 shoulders (26.3%), among which 12 shoulders (7.2%) showed OA on the preoperative radiographs. Consequently, CT-proven OA in the remaining 32 shoulders was incipient OA that was not revealed radiographically. Radiographs taken at follow-up revealed OA in 30 shoulders (18.0%), of which 24 (80%) had had OA proven by preoperative imaging. Preoperative CT-proven OA in 20 shoulders never became visible on postoperative radiographs. The severity of OA slightly increased in 14 joints (32%) during the postoperative period. The number of preoperative subluxations and the total number of preoperative dislocations/subluxations were significantly greater, and the percentages of male patients and glenoid bone defect greater than 20% of the anteroposterior diameter were higher for the 30 shoulders with postoperative OA.

Conclusion: Most postoperatively detected OA developed before surgery. The preoperative factors are profoundly involved in the development of OA. The role of surgery in favoring the OA development appears to be inconclusive. The development and progression of OA cannot be prevented by surgical intervention, but the progression of postoperative OA is extremely slow.

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