Total hip arthroplasty for Crowe type IV developmental dysplasia of hip in adults / 中国组织工程研究

BACKGROUND:Total hip arthroplasty is an optimal choice for patients with late hip dysplasia. Crowe type IV developmental dysplasia of the hip increases the difficulty of the operation, and the surgery is controversial. OBJECTIVE:To evaluate the clinical effects of total hip arthroplasty on Crowe type IV developmental dysplasia of the hip and the method of reconstruction of acetabulum and the treatment of proximal femur. METHODS:A total of 12 patients (14 hips) with Crowe type IV developmental dysplasia of the hip underwent total hip arthroplasty. Preoperative Harris hip score was averagely (35.0±6.8) points. Al hips were treated with smal acetabular components combined with medial protrusion technique in acetabular reconstruction, as wel as subtrochanteric shortening osteotomy in femur. Joint function of hips was evaluated according to the Harris hip score. RESULTS AND CONCLUSION:Al patients were fol owed up with an average of 4.6 years (ranged 1 to 7 years). Two cases (two hips) suffered from infraction of greater trochanter of femur during replacement, and it was fixed with wire. There was complete sciatic nerve injury in one case, which partial y restored after conservative treatment for 1 month. No infection, prosthesis loosening, or deep venous thrombosis with obvious clinical manifestations was visible. Bone union was observed at the site undergoing osteotomy at the side of femur. After replacement, final fol ow-up showed that Harris hip score was averagely (84.0±7.0) points. The mean amount of postoperative leg lengthening was 5 cm (range 4-6 cm). Shortened limbs were corrected satisfactorily. These results suggested that total hip arthroplasty using smal acetabular component, medial protrusion, and femoral subtrochanteric shortening osteotomy technique for the Crowe type IV developmental dysplasia of the hip can effectively restore hip function and leg length. The long-term curative effects require further investigations.

Study on energy attenuation of ultrasonic guided waves going through girth welds.

Ultrasonic guided wave is introduced as a new non-destructive long range pipe inspection method. It can be used to inspect pipe which is inaccessible to other conventional NDT methods, and rapid, long distance inspection can be achieved. An investigation of the guided ultrasonic waves traveling along pipe with special geometry characteristics, such as elbow, several girth welds, and some artificial defects is described. In this paper, factors that may cause attenuation of ultrasonic guided waves are discussed and energy attenuation of longitudinal and torsional guided waves is studied on an experimental pipe having seven girth welds. Good agreement has been obtained between the experiments and the predictions. In the end, the detection sensitivity and locating precision of two guided waves, namely longitudinal and torsional, were compared on defects, such as notch, burr and branch.

Effect of subtotal splenectomy with retroperitoneal splenic transposition and devascularization on portal hypertensive gastropathy / 中国普通外科杂志

Objective To study the effect of the modality of subtotal splenectomy with retroperitoneal splenic transposition combined with devascularization on portal hypertensive gastropahy(PHG). Methods Subtotal splenectomy with retroperitoneal splenic transposition combined with devascularization was performed in 48 cirrhotic patients with portal hypertension. Forty seven patients were followed up for 2 years to 13 years (average 91 months). PHG were observed by gastroscopy.Results At 2 months postoperation ,PHG was significantly aggravated compared with that of preoperation (P

1H-MR Spectroscopy of Bone and Soft Tissue Tumors with in Vivo / 实用放射学杂志

Objective To determine if in vivo detection of choline by1H-magnetic resonance spectroscopy(1H-MRS) could differentiate between benign and malignant bone and soft tissue tumors.Methods MR spectroscopy was performed in 28 cases, including 5 healthy subjects and 23 cases of extremital tumors. Examination was performed by using a point-resolved spectroscopic sequence with echo times of 35,144 and 288 ms.Results 1H-MRS spectrum was different among normal tissue, benign and malignant tumor.Conclusion Choline can be reliable detected in malignant tumor of bone and soft tissue by using1H-MRS.1H-MRS can help differentiate malignant tumor from benign tumor.