A New Method to Protect Blood Supply in the Treatment of Femoral Neck Fractures: Bidirectional Compression Porous Tantalum Screws.

Objective: To explore the clinical effect of a new type of bidirectional pressurized porous tantalum screw (PTS) internal fixation in treating femoral neck fractures (FNFs).

Methods: In this study, geometric models of FNF were first established via reverse engineering method, followed by stimulation of the strength of PTSs in fixation of FNFs. A randomized control trial study was then conducted of 41 patients with FNF from October 2015 to December 2018.

[Effects of low intensity resistance training of blood flow restriction with different occlusion pressure on lower limb muscle and cardiopulmonary function of college students].

The study compared the effects of low intensity resistance training with blood flow restriction (BFR) with different occlusion pressure on lower limb muscle and cardiopulmonary function. Twenty-seven college students were randomly divided into three groups by different occlusion pressure: 0 mmHg (group C), 120 mmHg (group L) and 180 mmHg (group H). Before and after training (3 times a week for 12 weeks) with an inflatable cuff (20% 1RM, half squat), the muscle thickness(MTH)of rectus femoris and medius femoris, relative peak knee extensor moment(rM), peak power(P), relative maximal oxygen uptake(rVOmax), stroke volume(SV), cardiac output(CO), ejection fraction(EF) and other indicators were measured for all subjects.

[The effects of 10-week core strength training on the body balance in the middle-aged men].

Objective: To observe the effects of core strength training on the body balance of middle-aged men, which could provide evidence for improving the body balance and reducing the risk of falls in the middle-aged men.

Methods: Sixteen 50~60 years old men were randomly divided into experimental group (core strength training, =8) and control group(=8). Intermittent core strength trainings were used for dynamic and static training, push-pull training and unarmed lower limb strength training by suspension ropes and yoga mat.

[Finite element simulation of bone grafting process for avascular necrosis of femoral head].

Based on the unilateral CT images of a clinical patient in stage III for avascular necrosis of femoral head, three-dimensional finite element models of proximal femur are established, including normal model, necrosis model and prothetic model. Based on the same set of CT images, the material properties are assigned to the three finite element models respectively. Finally, the process of bone grafting for avascular necrosis of femoral head is simulated with finite element analysis.