Analysis of X-Ray Findings of Osteosarcoma / 대한정형외과학회잡지

The diagnosis of osteosarcoma is based on both clinical, rediological and histopathological findings, but the majority of the patients with osteosarcoma can be diagnosed with a reasonable degree of confidence from the appearance of the lesion on the plain X-ray film. The combination of soft tissue mass and calcification, increased intramedullary radiodensity, cortical bone destruction,and marked periosteal reaction such as Codmans triangle and sunburst reaction is the radiographic hallmark of osteosarcoma, Among the above mentioned radiological findings, the presence of soft tissue mass with calcification can be so strongly suspected to be nearly diagnostic on the X- ray examination alone. The author performed radiological analysis of 40 cases of osreosarcoma which was experienced at the Department of Orthopedic Surgery, College of Medicine, Korea University including other hospitals from 1975 to 1980 and particulary observed correlation between the soft tissue mass with calcification and other radiological findings. The results obtained as follow: 1. Of the 40 cases, soft tissue mass with calcification were observed in 32 cases(80%), cortical destruction in 31 cases(77.5%), periosteal reaction in 24 cases(60%), sunburst reaction in 23 cases(57%) and Codmans triangle in 21 cases were observed. 2. Of the 40 cases, 23 cases(57.5%) were osteoblastic, 12 cases(30%) of osteolytic and 5 cases(12.5%) of mixed type. 3. The shadow of soft tissue mass with calcification was observed 11 cases(91.7%) among 12 cases of osteolytic type, 28 cases(91%) among 31 cases of cortical destruction, 21 cases(87.5%) among 24 cases of periosteal reaction, 20 cases(86.9%) among 23 cases of sunburst reaction and 18 cases (85.7%) among 21 cases of Codmans triangle.

The Kinematic Study for Stability of Contact Surface Area between Acetabular Cup and Femoral Prosthesis on the Flexion, Abduction, or External Rotation of the Hip Joint / 대한정형외과학회잡지

The range of acetabular cup and femoral prosthesis according to the different angle of insertion has been reported by many investigators. But no reports are still avairable about the surface area of the exposed femoral head at the position causing unstability of the femoral head. So the authors had studied the 3 types of prosthesis of Charnley, Muller and Mckee-Farrar and their acetabular cup by inserting them at different angles into the 10 human cadavaric skeleton to obtain the most stable position of the prosthesis and to calculate the surface area of the femoral head at the stable position. The result obtained are as follows. 1. In. Flexion: Among 3 types of prosthesis, the maximum stability is 78% to the exposed area of the femoral head in Mckee-Farrar prosthesis with 10 of the femoral anteversion, 45 of acetabular inclination and 45 of acetabular anteversion. The minimum stability is 41% to the exposed area of the femoral head in Mckee-Farrar prothesis with femoral neutral version, 45 of acetabular inclination and 15 of acetabular retroversion. 2. In Abduction: Among 3 types of prosthesis, the maximum stability is 86.5% to the exposed area of the femoral head in Mckee-Farrar prosthesis with 10 of the femoral anteversion, 45 of acetabular inclination and 45 of acetabular anteversion. The minimum stability is 50% to the exposed area of the femoral head in Muller prosthesis with femoral neutral version, 45 of acetabular inclination and 30 of acetabular retroversion. 3. In External Rotation: Among 3 types of prosthesis, the maximum stability is 85. 8% to the exposed area of the femoral head in Mckee-Farrar prostbesis with femoral neutral version, 45 of acetabular inclination and 30 of acetabular retroversion. The minimum stability is 46% to the exposed area of the femoral head in Mckee-Farrar prosthesis with femoral neutral version, 30 of acetabular inclination and acetabular neutral version. 4. There was no relationship between the degree of range of the femoral prosthesis & acetabular cup and the amount of the surface area of the exposed femoral head when dislocated.