[Arthroscopic surgery for injuries to the popliteal tendon area of the lateral meniscus].

Objective: To investigate the mid-term effect and complications of arthroscopic popliteal tendon suture in the treatment of lateral meniscus injury.

Methods: From January 2016 to December 2020, the data of 57 patients with lateral meniscus popliteal tendon injury treated by arthroscopic popliteal tendon suture fixation were retrospectively analyzed, including 35 males and 22 females, aged from 18 to 47 years old with an average of (32.9±7.

[Progress in arthroscopic surgery for injury of superior labrum anterior posterior of shoulder joint].

Superior labrum anterior posterior (SLAP) injury is a major challenge for orthopedic surgeons, due to the poor healing ability of the injured labrum. Although arthroscopic surgery is the gold standard for the treatment of SLAP injury, there are still disputes about the adaptation of different surgical techniques, the choice of anchors during operation, knotted or knotless anchors, and fixation methods. The authors believe that arthroscopic repair of SLAP lesions is effective for young patients with intact glenoid labrum(<35 years old) or with extensive activity, where single and knotless anchor is preferred.

[Arthroscopic subscapularis augmentation for the treatment of recurrent dislocation of shoulder with severe glenoid injury].

Objective: To investigate the method and clinical effects of the treatment of recurrent shoulder dislocation with severe glenoid injury by arthroscopic subscapularis augmentation.

Methods: From March 2019 to August 2020, 16 patients with recurrent dislocation of shoulder with severe glenoid injury underwent arthroscopic subscapularis augmentation, including 10 males and 6 females, aged from 18 to 50 years old with an average of (29.06±10.

[Research progress of graft application in promoting rotator cuff tendon-bone healing].

The incidence of re-tearing after rotator cuff repair is very high. The main reason is that the tendon-osseous junction after the operation is scar healed. In response to this problem, research in recent years has focused on the application of grafts, including cell transplantation, periosteum transplantation, cartilage transplantation, and biosynthetic transplantation.

[Comparative study on arthroscopic double posterior medial approach versus open surgery for acute simple posterior cruciate ligament tibial avulsion fracture].

Objective: To compare difference in clnical efficacy between arthroscopic double posterior internal approach and incisional surgery for acute simple posterior cruciate ligament tibial avulsion fractures.

Methods: Totally 52 patients with acute simple posterior cruciate ligament tibial avulsion fractures treated from June 2016 to June 2020 were retrospectively analyzed and divided into two groups according to different surgical protocols, 27 patients in arthroscopic group were treated with arthroscopic double posterior internal approach, including 16 males and 11 females, aged from 19 to 52 years old, with an average age of (34.9±9.

[Early efficacy analysis on arthroscopic autologous osteochondral grafting in the treatment of recurrent anterior shoulder dislocation].

Objective: To investigate the early efficacy of arthroscopic autologous osteochondral grafting in the treatment of recurrent anterior shoulder dislocation.

Methods: From January 2019 to January 2021, 17 patients with recurrent anterior dislocation of shoulder who underwent arthroscopic autologous osteochondral grafting were selected, including 12 males and 5 females, ranging in age from 17 to 55 years old, with a mean of (32.88±12.

[Suture technique for rotator cuff tears' repair under arthroscopic].

Shoulder arthroscopic as a conventional method usually is applied to repair rotator cuff tears. In clinical, plenty single-row, double-row and transosseous tunnels suture technique are performed, but the ideal suture technique for rotator cuff repair is not found. Compared with single-row, double-row has better strength in biomechanics property.

Resource recycling sustainability assessment in ready-mixed concrete manufactured on energy consumption and environmental safety in China.

With the rapid development of construction industry, consumption of ready-mixed concrete has increased rapidly in China. As a kind of green building material and waste comprehensive utilization product, industrial solid waste-based ready-mixed concrete have better performance in terms of resource conservation and durability. However, some typical issues are associated with industrial solid waste resource recycling in ready-mixed concrete production process such as energy and material consumption, as well as leaching pollutant emissions.

[Research advance in surface modification of titanium alloys with chitosan].

Titanium alloy has good biological properties and is commonly used in orthopedics, but its bone integrity and antibacterial properties are poor, so surface modification is needed to make up for its shortcomings. Chitosan has good biocompatibility and film forming ability, and can be used as a carrier to introduce the target drug to the surface of titanium alloy, which can effectively improve the biological properties of titanium alloy materials and increase its application range. In this paper, the related research of chitosan surface modified titanium alloy materials in recent years is summarized.

[Progress on effect of osteoporosis on rotator cuff repair].

The rate of rotator cuff injury repair and retear is high in elderly patients due to the combination of different degrees of osteoporosis. To solve this problem, many surgeons try to reduce retear rate of rotator cuff injuries in these patients by increasing the initial fixation strength of anchors and changing local bone conditions. The rapid advances of tissue engineering have made it possible to use growth factors as an aid.

A Benziodoxole-Based Hypervalent Iodine(III) Compound Functioning as a Peptide Coupling Reagent.

1-Benzoyloxy-1,2-benziodoxol-3-(1H)-one (IBA-OBz), a readily available and bench stable benziodoxole-based iodine(III) reagent, can be employed for the synthesis of dipeptides from various standard and sterically hindered amino acids in the presence of (4-MeOCH)P. The combined system of IBA-OBz/(4-MeOCH)P is also successfully applied to the solid-phase peptide synthesis and a pentapeptide leu-enkephalin in unprotected form has been synthesized. Density functional theory calculations reveal that the rate-limiting step is nucleophilic attack of 4-dimethylaminopyridine (DMAP) onto IBA-OBz.

[Risk factors for minimally invasive surfactant administration failure in preterm infants with respiratory distress syndrome].

Objective: To identify risk factors for minimally invasive surfactant administration (MISA) failure in the treatment of preterm infants with respiratory distress syndrome (RDS) and the influence of MISA failure on neonatal outcome.

Methods: A retrospective analysis was performed for the clinical data of 148 preterm infants with a gestational age of ≤32 weeks and a clinical diagnosis of RDS, who were admitted to the neonatal intensive care unit of eight tertiary hospitals in Beijing, Tianjin and Hebei Province from July 1, 2017 to December 31, 2018 and were treated with MISA (bovine pulmonary surfactant, PS). According to whether MISA failure (defined as the need for mechanical ventilation within 72 hours after MISA) was observed, the infants were divided into two groups: MISA failure group (n=16) and MISA success (n=132).

[Characteristics of R bone age, C bone age, and T bone age in children with different causes of short stature based on Tanner and Whitehouse skeletal age assessment system 2].

Objective: To study the characteristics of R bone age, C bone age, and T bone age in children with different causes of short stature based on the Tanner and Whitehouse skeletal age assessment system 2 (TW2), and to provide a reference for the etiological diagnosis of short stature.

Methods: Three hundred and sixty-three children with previously untreated short stature were classified into four groups according to the causes: growth hormone deficiency (GHD; 27 cases), idiopathic short stature (ISS; 280 cases), small for gestational age (SGA; 41 cases), and Turner syndrome (TS; 15 cases). The X-ray films of their left hand-wrist bones were taken to determine the bone age.