Three-dimensional symmetry and parallelism of the skeletal and soft-tissue poria in patients with facial asymmetry / 대한치과교정학회지

OBJECTIVE: The purpose of this study was to examine the symmetry and parallelism of the skeletal and soft-tissue poria by three-dimensional (3D) computed tomographic (CT) imaging. METHODS: The locations of the bilateral skeletal and soft-tissue poria in 29 patients with facial asymmetry (asymmetric group) and 29 patients without facial asymmetry (symmetric group) were measured in 3D reconstructed models of CT images by using a 3D coordinate system. The mean intergroup differences in the anteroposterior and vertical angular deviations of the poria and their anteroposterior and vertical parallelism were statistically analyzed. RESULTS: The symmetric and asymmetric groups showed significant anteroposterior angular differences in both the skeletal and the soft-tissue poria (p = 0.007 and 0.037, respectively; Mann-Whitney U-test). No significant differences in the anteroposterior and vertical parallelism of the poria were noted (p < or = 0.05; Wilcoxon signed-rank test). CONCLUSIONS: In general, the skeletal poria are parallel to the soft-tissue poria. However, patients with facial asymmetry tend to have asymmetric poria.

Revision Total Hip Arthroplasty using Allogenic Impaction Bone Grafts and Cemented Cup in Acetabular Bone Deficiency: Minimum Seven Years Clinical and Radiological Analysis

PURPOSE: This study examined the minimum seven years clinical and radiological results of revision total hip arthroplasty using an allogenic impaction bone graft and a cemented cup in an acetabular bone deficiency. MATERIALS AND METHODS: Fifty two revision total hip arthroplasty procedures performed on forty nine patients between March 1992 and June 1998 and followed for more than minimum seven years were examined. The clinical and radiological results were evaluated by Harris hip score and roentgenography including anterior-posterior view of pelvis and lateral view of operated hip. RESULTS: The mean Harris hip score was 47 points preoperatively, 81 points at three years after revision, and 84 points at seven years. The radiological evaluation revealed osseous union that trabeculated between grafted bone and host bone within four months in 47 hips, a complete grafted bone-cement radiolucent line of two millimeters or more in at least one zone in 5 hips at two years and in 7 hips at the seven year follow-up. CONCLUSION: We recommend the technique using an allogenic impaction bone graft and cemented cup to reconstruct an acetabular cavitary defect in revision total hip arthroplasty.