Changes of gluteus medius muscle in the adult patients with unilateral developmental dysplasia of the hip.

Background: The gluteus medius muscle is essential for gait and hip stability. Changes that occur in the gluteus medius muscles in patients with developmental dysplasia of the hip (DDH) are not well understood. A better understanding of DDH related changes will have positive repercussions toward hip soft tissue reconstruction.

Evaluation of medial acetabular wall bone stock in patients with developmental dysplasia of the hip using a helical computed tomography multiplanar reconstruction technique.

Background: The technique of medialization has been used to reconstruct acetabula at the level of true acetabula in total hip arthroplasty (THA) in patients with developmental dysplasia of the hip (DDH). Appreciation of the bone stock in the medial acetabular wall is significant for making an optimal acetabular reconstruction plan and avoiding complications.

Purpose: To evaluate the bone stock of the medial acetabular wall and its relation to the degree of subluxation in patients with DDH using computed tomography (CT).

[Study of inducing bone marrow-derived mesenchymal stem cells into chondrocytes in vitro].

Objective: To explore a method of isolation, culture and chondrogenic phenotype differentiation of mesenchymal stem cell (MSCs) from the bone marrow of rats in vitro and to offer experimental reference for the resources of seeding cells in cartilage tissue engineering.

Methods: MSCs were isolated from bone marrow and purified by density gradient centrifuge and cultured in vitro. The MSC adherence formed and those in passage 3 were chosen to induce into chondrogenic differentiation.

Interactions between effects of estrogen receptor gene polymorphisms on BMD and experiences of the first spermorrhea in Chinese Han boys.

Objective: To study the interaction between polymorphisms of estrogen receptor (ER) gene and puberty on bone mineral density (BMD).

Methods: One hundred and forty-six boys aged 13-17 years were divided into two groups according to their first spermorrhea. DNA was analyzed for Xba I and Pvu II genotypes by PCR-RFLP.

[Relationships among vitamin D receptor gene and calcium absorption, bone mass].

The association between vitamin D receptor gene polypmorphisms and bone mass is controversial. Many studies have found polymorphism of vitamin D receptor (VDR) gene be associated with bone mass. But some studies show no association between vitamin D receptor gene polymorphism and bone mass.