Impact of the COVID-19 pandemic on the well-being of preschoolers: A parental guide.

Unlabelled: Unexpected changes brought about by the coronavirus disease 2019 (COVID-19) have affected humans worldwide. This review attempts to address major parental concerns about the development of preschool-aged children during the pandemic from the perspectives of neuropsychology, consultation, and motor development for preschoolers aged 2-5 years.

Methods: A total of 273 articles including original data, review articles, national and regional perspectives, government websites, and commentaries were considered in this review, of which 117 manuscripts were excluded because they were unrelated to children, adolescents, or COVID -19 pandemic/upper respiratory infections.

The silhouette technique: improving post-operative radiographs for planning of correction with a hexapod external fixator.

Correction of deformity of a bone through use of a hexapod external fixator requires clear definition of the relationship between the bone and the frame. Achieving adequate orthogonal calibrated radiographs for this aim, with minimum X-ray exposure, can prove a challenge in the radiography suite. We describe a simple technique for obtaining adequate imaging, without the use of additional equipment.

Adolescent hallux valgus: a systematic review of outcomes following surgery.

Purpose: The management of adolescent hallux valgus (AHV) remains controversial, with reservations about both conservative and surgical treatments. Non-operative management has a limited role in preventing progression. Surgical correction of AHV has, amongst other concerns, been associated with a high prevalence of recurrence of deformity after surgery.

Effect of innominate and femoral varus derotation osteotomy on acetabular development in developmental dysplasia of the hip.

Background: Open reduction for the treatment of hip dislocation due to developmental dysplasia of the hip in children of walking age is frequently combined with either a femoral varus derotation osteotomy or an innominate osteotomy; however, it remains unclear which of these procedures is preferable in terms of subsequent hip development. The purpose of the present study was to compare acetabular development in patients managed for dislocation of the hip with open reduction combined with one of the two osteotomies.

Methods: Patients between fifteen months and four years of age with hip dislocations that were treated at two different centers were compared.

Osteoclastogenesis on hydroxyapatite ceramics: the effect of carbonate substitution.

Human osteoclasts derived from CD14+ve precursors were cultured on discs of stoichiometric hydroxyapatite (HA) and carbonate-substituted hydroxyapatite (CHA) of varying carbonate contents. The development of osteoclasts was qualitatively different on ceramics compared to dentine, occurring in discrete, confluent subpopulations, which suggests local cell signaling may be important in the process. Resorption was quantified by scanning electron microscopy, surface profilometry, and by calcium release into the culture medium.

Carbonate substituted hydroxyapatite: resorption by osteoclasts modifies the osteoblastic response.

Carbonate substitution within the hydroxyapatite (HA) lattice improves osteoconduction, although the mechanism by which this occurs is unclear. Discs of dense, sintered, phase-pure HA and AB-type carbonate substituted hydroxyapatite (CHA) were cultured for 21 days with human CD14+ cells in the presence of macrophage-colony stimulating factor (M-CSF) and soluble receptor activator of nuclear factor (NF)-kappaB (sRANKL), during which time osteoclasts developed and resorbed the ceramic surface. Discs were then seeded with human osteoblasts (HOBs), and proliferation and collagen synthesis were measured.

Grafting for periprosthetic femoral fractures: strut, impaction or femoral replacement.

Peri-prosthetic fractures are technically demanding to treat, as they require the skills of revision arthroplasty as well as those of trauma surgery. [Lindahl H, Malchau H, Herberts P, Garellick G. Periprosthetic femoral fractures classification and demographics of 1049 periprosthetic femoral fractures from the Swedish National Hip Arthroplasty Register.