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Articles by H Chang
Total Records ( 2 ) for H Chang
  M.V Jayaraman , H Chang and S.H. Ahn

BACKGROUND AND PURPOSE: Percutaneous sacroplasty has recently gained attention as a potential treatment for sacral insufficiency fractures. We describe a readily identifiable fluoroscopic landmark that facilitates needle placement and validate this with virtual needle placement by using CT data and fluoroscopically guided treatment in 13 patients.

MATERIALS AND METHODS: From CTs of 100 consecutive patients, the optimal target zone for needle placement in the sacral ala was defined at the intersection of lines from each of the corners of the first sacral segment, which is readily identifiable on lateral fluoroscopy. We then measured the distance from that virtual target point to the anterior sacral cortex by using the CT data for 3 specific trajectories: 1) parallel to the L5-S1 disk, 2) axial with respect to the patient, and 3) along the long axis of the sacrum. Case records of 13 consecutive patients treated by using this technique were also reviewed.

RESULTS: The mean distances for the 3 trajectories were 11.3 mm, 11.2 mm, and 12.8 mm, respectively. Needle placement would have been outside the anterior sacral cortex in 3 patients. Review of preprocedure imaging easily identified this potential breach. During treatment, needle placement by using the landmark was successful in all patients, and there were no complications.

CONCLUSIONS: A safe target for sacroplasty needle placement in the superolateral sacral ala can be defined by using the intersection of lines drawn from the corners of the first sacral segment. We validated this landmark by using it for treatment in 13 patients. Further studies evaluating clinical outcomes following sacroplasty will be necessary.

  H Chang , H. J Lee , J. H Mo , C. H Lee and J. W. Kim

Objective  To evaluate the relationship between findings via osteomeatal unit computed tomography (OMU CT) of the olfactory cleft and olfactory function in patients with chronic rhinosinusitis (CRS).

Design  Retrospective review of medical records.

Setting  Referral center.

Participants  Two hundred ten patients with CRS who underwent OMU CT and olfactory function tests were included in this study.

Main Outcome Measures  All the paranasal sinuses were graded via the Lund-Mackay scoring system. The olfactory cleft was graded on a scale of 0 to 4 according to its opacification. Olfactory function was evaluated by the butanol threshold test (BTT) and the 16-odor identification test (OIT).

Results  The radiologic grade of the olfactory cleft was more significantly correlated with olfactory function than the grades of the paranasal sinuses. In patients without allergy, the BTT and OIT scores were inversely correlated with the CT score of the olfactory cleft. However, in patients with allergy, only the BTT score had a negative correlation with the CT score of the olfactory cleft, whereas the OIT score did not. The OIT score showed a significant negative correlation with the opacification of the olfactory cleft in the mild and moderate CRS group only, whereas the BTT score showed a significant negative correlation in all stages of CRS.

Conclusions  The opacification of the olfactory cleft had a negative correlation with the olfactory function scores in patients with CRS. The olfactory cleft findings on OMU CT may give some clues to the olfactory function in patients with CRS.

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