Objective To investigate the pathological mechanism of hip dysplasia. Methods The leftknee joints of eighteen rabbits were fixed in extending position with plaster cylinder for four weeks, but their hip joints were fl...Objective To investigate the pathological mechanism of hip dysplasia. Methods The leftknee joints of eighteen rabbits were fixed in extending position with plaster cylinder for four weeks, but their hip joints were flexed. The right side served as control. Roentgenogram was made in all animals. The changes of the x-ray films and the pathological findings between left and right hips were compared. Results Appearance of hip dysplasia was obvious at four weeks after plaster fixation. There were pathological changes, including shallow ace-tabulum and flat femoral head, increased acetabular index and decreased acetabular head index on the x-ray films. Conclusion The hip dysplasia is the result of prolonged extending position of the knee joint. Abnormal knee posture seems to be one of the important factors of hip dysplasia. This kind of deformation may be worsened with time.展开更多
Acetabular dysplasia is one of the most important reasons for development ofsecondary osteoarthrosis of the hip joint. This paper introduced a method of modifiedWagner’s procedure, called acetabular rotation osteotom...Acetabular dysplasia is one of the most important reasons for development ofsecondary osteoarthrosis of the hip joint. This paper introduced a method of modifiedWagner’s procedure, called acetabular rotation osteotomy for the treatment of severeacetabular dysplasia in ten adults patients. These were followed up for 1-4 years. Fivecriteria including pain, gait, range of motion, measurement of roentgenographic changees,and CT scan were evaluated. From the limited information of this paper, it showed thatin all cases pain improved and range of motion did not reduced significantly. Comparingthe pre- and post-operative x-ray films, CE angle increased and exceeded the normal val-ue. Tonnis hip value decreased and approached the normal value, anteversion of theacetabulum improved, and the percentage of acetabular coverage increased as well.展开更多
The purpose of this study was to evaluate the preoperative radiographs with cases of developmental dysplasia of the hip (DDH) leading to rotational acetabular osteotomy (RAO) or curved peri-ace-tabular osteotomy (CPO)...The purpose of this study was to evaluate the preoperative radiographs with cases of developmental dysplasia of the hip (DDH) leading to rotational acetabular osteotomy (RAO) or curved peri-ace-tabular osteotomy (CPO), and examine the frequency of femoroacetabular impingement (FAI) related bone morphology in the acetabulum and femoral head-neck junction. Twenty-four hips with hip dyaplasia who underwent CPO or RAO were included in this study. Six hips had grade 0 and eighteen hips had grade 1 OA according to the Tönnis classification. We excluded patients with moderate and severe hip osteoarthritis and major femoral head deformities. Preoperative radiograph was evaluated on sharp angle, center-edge angle, alpha angle, crossover sign and posterior wall sign. Crossover signs were revealed in 7 hips (29.2%);posterior wall signs were revealed in 16 hips (66.7%);and cam-type deformities with an alpha angle of ≥50.5°were observed in 19 hips (79.2%) in preoperative evaluation. As determined using the Tönnis scale, no progression of osteoarthritis was found in 16 of the 24 hips;there was a one-grade progression in 8 hips. Among the 8 hips, either positive cross-over sign or posterior sign in acetabulum, and an alpha angle of ≥50.5°in femur were observed in six hips with progression of osteoarthritis. The presence of cam-type deformity and acetabular retroversion in patients who underwent RAO or CPO was relatively high in preoperative radiographs, and caution should be employed during surgery in patients with DDH. There is a possibility of secondary FAI due to excessive forward coverage of the bone fragments after RAO and CPO.展开更多
文摘Objective To investigate the pathological mechanism of hip dysplasia. Methods The leftknee joints of eighteen rabbits were fixed in extending position with plaster cylinder for four weeks, but their hip joints were flexed. The right side served as control. Roentgenogram was made in all animals. The changes of the x-ray films and the pathological findings between left and right hips were compared. Results Appearance of hip dysplasia was obvious at four weeks after plaster fixation. There were pathological changes, including shallow ace-tabulum and flat femoral head, increased acetabular index and decreased acetabular head index on the x-ray films. Conclusion The hip dysplasia is the result of prolonged extending position of the knee joint. Abnormal knee posture seems to be one of the important factors of hip dysplasia. This kind of deformation may be worsened with time.
文摘Acetabular dysplasia is one of the most important reasons for development ofsecondary osteoarthrosis of the hip joint. This paper introduced a method of modifiedWagner’s procedure, called acetabular rotation osteotomy for the treatment of severeacetabular dysplasia in ten adults patients. These were followed up for 1-4 years. Fivecriteria including pain, gait, range of motion, measurement of roentgenographic changees,and CT scan were evaluated. From the limited information of this paper, it showed thatin all cases pain improved and range of motion did not reduced significantly. Comparingthe pre- and post-operative x-ray films, CE angle increased and exceeded the normal val-ue. Tonnis hip value decreased and approached the normal value, anteversion of theacetabulum improved, and the percentage of acetabular coverage increased as well.
文摘The purpose of this study was to evaluate the preoperative radiographs with cases of developmental dysplasia of the hip (DDH) leading to rotational acetabular osteotomy (RAO) or curved peri-ace-tabular osteotomy (CPO), and examine the frequency of femoroacetabular impingement (FAI) related bone morphology in the acetabulum and femoral head-neck junction. Twenty-four hips with hip dyaplasia who underwent CPO or RAO were included in this study. Six hips had grade 0 and eighteen hips had grade 1 OA according to the Tönnis classification. We excluded patients with moderate and severe hip osteoarthritis and major femoral head deformities. Preoperative radiograph was evaluated on sharp angle, center-edge angle, alpha angle, crossover sign and posterior wall sign. Crossover signs were revealed in 7 hips (29.2%);posterior wall signs were revealed in 16 hips (66.7%);and cam-type deformities with an alpha angle of ≥50.5°were observed in 19 hips (79.2%) in preoperative evaluation. As determined using the Tönnis scale, no progression of osteoarthritis was found in 16 of the 24 hips;there was a one-grade progression in 8 hips. Among the 8 hips, either positive cross-over sign or posterior sign in acetabulum, and an alpha angle of ≥50.5°in femur were observed in six hips with progression of osteoarthritis. The presence of cam-type deformity and acetabular retroversion in patients who underwent RAO or CPO was relatively high in preoperative radiographs, and caution should be employed during surgery in patients with DDH. There is a possibility of secondary FAI due to excessive forward coverage of the bone fragments after RAO and CPO.
