Femtosecond laser-induced periodic grooves and nanopore clusters make a synergistic effect on osteogenic differentiation.

Polyether-ether-ketone (PEEK) materials have good biocompatibility, excellent corrosion resistance, chemical stability and an elastic modulus close to that of natural bone. However, due to its biological inertness, PEEK may affect osteogenic differentiation and leads to osseointegration failure, though PEEK is expected to improve osseointegration. In this work, by changing the power of femtosecond laser, micro-grooves are made on the PEEK surface.

[Three-dimensional printed Ti6Al4V-4Cu alloy promotes osteogenic gene expression through bone immune regulation].

Objective: To investigate the effects of three-dimensional (3D) printed Ti6Al4V-4Cu alloy on inflammation and osteogenic gene expression in mouse bone marrow mesenchymal stem cells (BMSCs) and mouse mononuclear macrophage line RAW264.7.

Methods: Ti6Al4V and Ti6Al4V-4Cu alloys were prepared by selective laser melting, and the extracts of the two materials were prepared according to the biological evaluation standard of medical devices.

[Clinical effect of metatarsal diaphysis Z-shaped rotating osteotomy in moderate and severe hallux valgus with metatarsophalangeal joint incongruency].

To evaluate the clinical effect of Z-shaped rotating osteotomy of metatarsal diaphysis in patients with moderate and severe hallux valgus with metatarsophalangeal joint incongruency. We selected 36 patients (38 feet) with moderate and severe hallux valgus with metatarsophalangeal joint incongruency who underwent Z-shaped rotating osteotomy of metatarsal diaphysis in the First Affiliated Hospital of Army Medical University of Chinese PLA from September 2010 to January 2019. There were 2 males and 34 females with an average age of (49±18) years (18-77 years).

[Mid-term effectiveness of arthrolysis and hinged external fixation for treatment of stiff elbow caused by heterotrophic ossification].

Objective: To evaluate the mid-term effectiveness of arthrolysis and hinged external fixation for the treatment of stiff elbow caused by heterotrophic ossification.

Methods: Between January 2014 and December 2017, 11 patients with stiff elbow caused by heterotrophic ossification were admitted. There were 9 males and 2 females with an average age of 32 years (range, 14-48 years), and left side in 6 cases and right side in 5 cases.