Jeong Joon Yoo

The results of contemporary alumina-on-alumina total hip arthroplasty with a metal-backed socket and a cementless stem were encouraging after a minimum duration of follow-up of five years. We believe that these improved alumina-on-alumina bearing implants offer a promising option for younger, active patients.

This study was undertaken to determine incidence, associated risk factors, and clinical outcomes of a diastasis of pubic symphysis. Among 4,151 women, who delivered 4,554 babies at the Department of Obstetrics of Seoul National University Bundang hospital from January 2004 to December 2006, eleven women were diagnosed as having a symptomatic diastasis of pubic symphysis. We estimated the incidence of the diastasis and identified the associated risk factors. To evaluate the pain relief and reduct

The objective of this study was to test the hypothesis that platelet-rich plasma (PRP) pretreatment on a poly-lactic-co-glycolic acid (PLGA) mesh scaffold enhances the healing capacity of the meniscus with human chondrocyte-seeded scaffolds in vivo, even when the seeded number of cells was reduced from 10 million to one million. A flexible PLGA mesh scaffold was pretreated with PRP using a centrifugal technique. One million human articular chondrocytes were seeded onto the scaffold by dynamic os

Level IV, prognostic study. See the Guidelines for Authors for a complete description of levels of evidence.

Ceramic-on-ceramic bearing surfaces in total hip arthroplasties (THAs) are an attractive alternative coupling and may offer a promising option for young active patients. We evaluated the clinical results of 72 contemporary primary cementless alumina-on-alumina THAs performed in 61 patients younger than 40 years (mean age, 30 years), after a 5-year minimum follow-up. Most patients (97%) were able to return to their prearthritic activity levels, and none changed occupation because of a postoperati

Background: Ceramic-on-ceramic couplings are attractive alternative bearing surfaces that have been reported to eliminate or reduce problems related to polyethylene wear debris. Disappointing experiences with alumina ceramic bearings in the past have led to many improvements in the manufacture and design of ceramic implants. The purpose of the present study was to report the results of contemporary alumina-on-alumina total hip arthroplasties with regard to wear, osteolysis, and fracture of the c

A composite material consisting of poly(epsilon-caprolactone) (PCL) and silica was prepared and evaluated as a bioactive bone substitute. The composite was synthesized by the co-condensation of tetraethyl orthosilicate and PCL and end-capped with triethoxysilane (Si-PCL). The as-prepared specimens were subjected to an initial heat treatment of 2 days at 60 degrees C, followed by further heat-treatments at 100 degrees C, 150 degrees C, and 200 degrees C for 24 h. The tensile mechanical properties

1 Department of Orthopaedic Surgery, Seoul National University Hospital, 28 Yongondong Chongnogu, Seoul 110-744, Korea. E-mail address for H.J. Kim: [email protected]

A cell-based engineered construct can be used for healing of intractable meniscal lesions. Our aims were to assess the culture conditions (static versus dynamic oscillation) and the healing capacity of the chondrocyte-seeded flexible implants in a heterotopic mouse model. Swine articular chondrocytes were labeled with PKH 26 or DiI dye and seeded onto a flexible PLGA scaffold using dynamic oscillating conditions for 24 h. Half of cell-seeded scaffolds were cultured in the same dynamic conditions

BACKGROUND: The number of human immunodeficiency virus (HIV)-infected patients is increasing constantly, and it is well known that there is a significantly high prevalence of osteonecrosis of the femoral head in HIV-infected patients. Therefore, it is important to develop methods that can ensure the safety of both the patients and medical personnel who participate in surgery on HIV-infected patients. Recently, the authors performed 8 procedures on 5 HIV-infected patients. This paper reports our