[Biomechanical study on a net-fixation of Kirschner wire in treating depressed tibial plateau fractures].

OBJECTIVE: To evaluate the biomechanical properties of tibial plateau depressed fracture fixed with a net-fixation of Kirschner wires. METHODS: Twenty homemade fracture models were fixed with eight 1.5 mm Kirschner wires in a net-fixation; 20 homemade fracture models were fixed with two 3.5 mm cortical screws. Plane-compressed and dot-compressed test were made on each 10 models of the two groups. The maximal force of anti-ompress and stiffness were measured and evaluated. RESULTS: In plane-compressed test,mean maximal force of anti-compress and stiffness for screw fixation was (1,925.31 +/- 444.26) N and (2.28 +/- 0.53) N/mm2, respectively, for net-fixation was (1,609.62 +/- 277.72) N and (1.90 +/- 0.33) N/mm2, respectively. There was no statistical difference between the two fixation methods (P > 0.05). In dot-compressed test,mean maximal force of anti-compress and stiffness for screw fixation was (411.13 +/- 233.88) N and (2.66 +/- 1.52) N/mm2,respectively,for net-fixation was (1,105.58 +/- 290.66) N and (7.18 +/- 1.89) N/mm2,respectively,the net-fixation was better than that of the screw fixation (P< 0.01). CONCLUSION: Treatment of tibial plateau depressed fracture with a net-fixation of Kirschner wires is a biological fixation and is a reliably method.

4,4',5,5'-Tetra-kis(benzyl-sulfan-yl)tetra-thia-fulvalene.

The asymmetric unit of the title compound, C(34)H(28)S(8), contains two crystallographically independent half-mol-ecules. The mol-ecules lie on centers of inversion. The four benzene rings of each mol-ecule are substantially twisted from the planes of the 1,3-dithiole rings, forming dihedral angles of 43.6 (2) and 61.4 (1)° in one mol-ecule and 54.2 (1) and 65.2 (1)° in the other.

[Dissection of prostate coalesce in treatment of benign prostate hypertrophy with relatively small volume].

OBJECTIVE: To evaluate the curative effect of dissection for coalesce of prostate in treatment of bladder outlet obstruction (BOO) caused by benign prostate hypertrophy (BPH) with relatively small volume (less than 30 g). METHODS: Thirty-six patients of BOO caused by BPH with relatively small volume underwent dissection of prostate coalesce. Follow-up was conducted for 32 months (9 - 52 months). The values of international prostate symptom score (IPSS), maximum flow rate (Qmax), and postvoid residual volume (PRV) before and after treatment were measured and compared. RESULTS: The post-operative IPSS was 5.03 +/- 2.66, significantly lower than that before operation (14.19 +/- 5.35), the post-operative Qmax was (17.71 +/- 4.1) ml/s, significantly higher than that before operation [(6.19 +/- 2.14) ml/s], and the post-operative PRV was (8.53 +/- 4.78) ml, significantly lower than that before operation [(50.58 +/- 14.84) ml] (all P < 0.001). CONCLUSION: Dissection of prostate coalesce is an ideal method in treatment of BOO caused by BPH with relatively small volume (less than 30 g).