Backgroup: To compare the operative outcome between modified Kessler suture method and Bundle-Bundle suture for the treatment of acute rupture of Achilles tendon. Methods: A consecutive series of 72 patients who underwent operation of Achilles tendon rupture were evaluated. Thirty patients were treated by the bundle-bundle suture method (group A) and 31 patients by modified Kessler suture (group B). Functional examination included measurement of calf muscle circumference, and a single-leg heel-rise test. The diameter of the Achilles tendon of the trouble side was recorded compared with the contralateral limb through the MRI (magnetic resonance imaging). The number of single-leg heel-rise was recorded within 15s (height>5cm) compared with the uninjured side. The ankle joint range of motion is recorded. The evaluation form ATRS(Achilles Tendon Total Rupture Score), AOFAS(American Orthopedic Foot And ankle Society) Ankle-Hindfoot scale scores and VAS( visual analogue scale) pain score were used to evaluate the clinical outcome after a minimum follow-up period of 12 months postoperatively. Results: 61 patients at 1 year following surgery. There was no difference in mean follow-up time between the two groups (group A: 23.73±2.81 months; group B: 22.61±3.96 months). There were significant differences between the groups in heel-rise test 1.74±0.96 in group A, 2.37±1.42 in group B. Compared with the group B, the calf circumference of the injured side was bigger in group A (p=0.043). The cross-sectional diameters of the Achilles tendon after open repair was significantly different from that after percutaneus repair. There were no significant differences in ATRS, AOFAS and VAS at the final follow-up between the two groups. One patients of group A experienced delayed wound healing, which resolved in about 40 days. Conclusions : Two suture methods can provide good clinical results. Bundle-Bundle suture is more effective in solving the shortcomings of traditional methods. It is a safe and effective method, and is worthy of promotion.

Background: This study was performed to compare the operative outcome between percutaneous repair (modified Bunnell suture) and open repair (bundle-to-bundle suture) for treatment of acute Achilles tendon rupture.Methods: Seventy-two consecutive patients who underwent surgical treatment of Achilles tendon rupture were evaluated. Thirty-six patients were treated by the bundle-to-bundle suture technique (Group A), and 36 patients were treated by the modified Bunnell suture technique (Group B). Functional examination included measurement of the calf muscle circumference and performance of the single-leg heel-rise test. The length and diameter of the Achilles tendon were compared between the injured and uninjured sides using magnetic resonance imaging. The number of single-leg heel rises (height of >5 cm) performed within 15 s was compared between the injured and uninjured sides. The ankle joint range of motion was also recorded. The Achilles tendon total rupture score (ATRS), American Orthopaedic Foot and Ankle Society (AOFAS) ankle-hindfoot scale score, and visual analog scale (VAS) pain score were used to evaluate the clinical outcome after a minimum 12-month postoperative follow-up period.Results: In total, 61 patients were followed up. The mean follow-up time was not significantly different between Group A (23.73 ± 2.81 months) and Group B (22.61 ± 3.96 months). However, there were significant differences in the heel-rise test (Group A, 1.74 ± 0.96; Group B, 2.37 ± 1.42) and length of the Achilles tendon (Group A, 11.98 ± 1.64 cm; Group B, 11.11 ± 1.74 cm). The calf circumference of the injured side was significantly larger in Group A than B (p = 0.043). The cross-sectional diameter of the Achilles tendon after open repair was significantly different from that after percutaneous repair. There were no significant differences in the ATRS, AOFAS score, or VAS score at the final follow-up between the two groups. One patient in Group A had delayed wound healing, which resolved in about 40 days.Conclusions: Both suture methods described in this report can provide good clinical results. The bundle-to-bundle suture technique is more effective for restoration of the Achilles tendon length and muscle function. This method is safe, effective, and worthy of promotion.

The PV-storage virtual synchronous generator (VSG) is an emerging inverter control strategy for a weak grid; however, it is susceptible to random load perturbation, which causes unnecessary charging and discharging of energy storage, affecting its lifetime. In this paper, VSG selective input and output strategy is proposed to improve the lifespan of energy storage. The strategy comprises two PV-storage VSG operation modes and its power coordination control method. Firstly, the strategy of selective VSG input based on the disturbance size is proposed, and the VSG input moment is obtained by solving the system of model equations offline. The selective VSG start method is realized by matching changes in disturbance frequency online so that the grid can preferentially utilize the physical generator inertia. Secondly, the dynamic exit strategy of VSG control based on dynamic frequency characteristics is constructed to avoid the secondary throughput of PV-storage VSG during the frequency recovery phase after the grid is disturbed. It is necessary as the grid variation may affect the energy storage life and reduce frequency recovery speed. Finally, the correctness and effectiveness of the proposed scheme are verified by simulation and semi-physical experiment.

Multifunctional electrodes possess superior properties such as high photoelectric properties and high stability. Laser manufacturing process is one of the widely used method for electrode fabrication. However, the current multifunctional electrode laser manufacturing process suffers from low fabrication speed. Here, we report a high-efficiency laser digital patterning process to fabricate copper-based flexible transparent conducting electrodes. By using a spatially modulated, one single laser spot is modulated into an array of spots with equal intensity, and the fabrication speed can be improved by more than 20 times over the traditional single pulse processing. In addition, copper mesh electrodes with a high photoelectric property have been fabricated. A transparent touch screen panel and multifunctional windows are fabricated with transparent electrodes to demonstrate their use in vehicle defogging, portable heating, and wearable devices.