Publications by authors named "Chan Woo Park"

Background: Multiple epiphyseal dysplasia (MED) is an inherited condition characterized by delayed and irregular ossification of the epiphyses that can lead to premature osteoarthritis. This study aimed to report the long-term outcomes of total hip arthroplasty (THA) in patients with MED.

Methods: We reviewed THAs performed in MED patients at a single institution between April 1997 and May 2014.

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Background: Sciatic neuropathy can result from pressure, injury, or inflammation around the sciatic nerve. In rare instances, sciatic neuropathy is caused by an intraneural ganglion cyst (IGC) originating from the hip joint. However, an effective treatment modality for this condition has not yet been established.

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Purpose: Hip resurfacing arthroplasty (HRA) is recommended for younger patients seeking higher levels of activity. However, femoroacetabular cup impingement (FACI) between the femoral neck and acetabular prosthesis remains a concern. This study aimed to determine the incidence, risk factors, and prognostic consequences of FACI after HRA.

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Polar tip growth in plants occurs only in root hairs and pollen tubes. In particular, root hair growth is considered very important in the growth of plants, as it is critical for water and nutrient absorption. Polar tip growth is regulated by various factors, including plant hormones such as abscisic acid (ABA) and gibberellin (GA) and cell wall modifications.

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Background: We previously reported the mean 6-year outcomes of total hip arthroplasty (THA) using fourth-generation ceramic-on-ceramic (CoC) articulations. With extended observations, this study aimed to report the mean 12-year outcomes focusing on bearing-related complications of CoC THA.

Methods: We reviewed primary CoC THAs performed between May 2009 and April 2012 at a single institution.

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Selective adsorption is the most suitable technique for eliminating trace amounts of Cs from various volumes of Cs-contaminated water, including seawater. Although various metal ferrocyanide (MFC)-functionalized magnetic adsorbents have been developed for the selective removal of Cs and magnetic recovery of adsorbents, their adsorption capacity for Cs remains low. Here, magnetic hierarchical titanium ferrocyanide (mh-TiFC) was synthesized for the first time for enhanced Cs adsorption.

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Article Synopsis
  • Rice is a crucial cereal crop affected by rice blast disease, which is caused by a fungal pathogen, and its resistance genes need to be identified as climate change increases pathogen diversity.
  • Researchers utilized bioinformatics to identify candidate leucine-rich repeat (LRR) domain receptor-like proteins (OsLRR-RLPs) linked to disease resistance in rice, revealing differences in DNA sequences among various rice subpopulations.
  • Findings show that rice varieties lacking specific LRR genes are more susceptible to the disease, while those that express these genes exhibit resistance, highlighting their potential for developing resistant rice cultivars through breeding strategies.
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Separating radioactive cesium from nuclear waste and contaminated environments is critical to mitigate radiological hazards. In response to this need, remote-controllable and Cs-selective micromotor adsorbents have been considered as a promising technology for rapid in-situ cleanup while minimizing secondary waste and radiation exposure to workers. In this study, we demonstrate the active and rapid removal of a radioactive contaminant from water by leveraging the magnetic manipulation capabilities of a helical and magnetic Ni micromotor coated with Cs-selective nickel ferrocyanide (NiFC).

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Background: Although the modular sleeve concept for femoral implants has several advantages, studies reporting on greater than 20-year outcomes are limited. This study aimed to report the mean 23-year results of total hip arthroplasty (THA) using a modular stem with metaphyseal fixation sleeve.

Methods: This study reviewed primary THAs performed using a modular stem between October 1994 and April 1998.

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Background: The combination of propofol and remifentanil results in better surgical field conditions during endoscopic sinus surgery than inhalation anesthesia. This study compared surgical field conditions between two groups receiving low or high concentration of remifentanil and hemodynamic variables using non-invasive cardiac monitoring.

Methods: Fifty-four patients between ASA I or II, were randomly assigned to either the high-concentration remifentanil group (HR), effect-site concentration of 8 ng/mL or the low-concentration remifentanil group(LR), effect-site concentration of 4 ng/mL.

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Childhood neglect and/or abuse can induce mental health conditions with unknown mechanisms. Here, we identified stress hormones as strong inducers of astrocyte-mediated synapse phagocytosis. Using in vitro, in vivo, and human brain organoid experiments, we showed that stress hormones increased the expression of the Mertk phagocytic receptor in astrocytes through glucocorticoid receptor (GR).

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We evaluated the clinical outcomes of using type 1 collagen gel after therapeutic resectoscopy; overall, 150 women aged > 20 who planned to undergo therapeutic resectoscopy were enrolled. The patients were randomly assigned to either of the anti-adhesive treatment groups: the type 1 collagen gel (Collabarrier) (study group; N = 75) or the sodium hyaluronate and sodium carboxymethylcellulose gel group (control group; N = 75) after resectoscopy. One month after applying anti-adhesive materials, postoperative intrauterine adhesions were evaluated using second-look hysteroscopy; the incidence rate of postoperative intrauterine adhesions examined through second-look hysteroscopy showed no significant differences between the groups.

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Background: Periprosthetic femoral fractures (PFFs) remain a major concern following cementless total hip arthroplasty (THA). This study aimed to evaluate the association between different types of cementless tapered stems and the risk of postoperative PFF.

Methods: A retrospective review of primary THAs performed at a single center from January 2011 to December 2018 included 3,315 hips (2,326 patients).

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Article Synopsis
  • - Iliopsoas tendinopathy (IPT) is a condition that can cause ongoing groin pain after total hip arthroplasty (THA), and this study aimed to analyze its characteristics, incidence, risk factors, and treatment outcomes post-surgery.
  • - The study reviewed 1,602 THA procedures and found IPT in 3.3% of patients, revealing that those with IPT experienced greater leg lengthening and more cases of anteroinferior cup prominence compared to those without IPT.
  • - Treatment results showed that patients who underwent arthroscopic tenotomy had significant pain relief, while only a small percentage of those treated non-operatively reported improvement, indicating tenotomy's effectiveness for addressing IPT-related groin
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Background: Cementing a new liner into a secure, well-positioned metallic shell can be a less-invasive strategy in revision total hip arthroplasty (THA). This study aimed to report the mean 14-year outcomes of cementing highly cross-linked polyethylene (XLPE) liners into well-fixed acetabular shells in revision THAs.

Methods: This study reviewed a single-surgeon series of cementing XLPE liners into well-fixed acetabular components.

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Mechanically stretchable strain sensors gain tremendous attention for bioinspired skin sensation systems and artificially intelligent tactile sensors. However, high-accuracy detection of both strain intensity and direction with simple device/array structures is still insufficient. To overcome this limitation, an omnidirectional strain perception platform utilizing a stretchable strain sensor array with triangular-sensor-assembly (three sensors tilted by 45°) coupled with machine learning (ML) -based neural network classification algorithm, is proposed.

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Stretchable electronics have become essential for custom-built electronics, self-assembling robotics, and wearable devices. Although many stretchable electronics contain integrated systems, they still limit bulky connection systems. We introduce a new dual-functioned self-attachable and stretchable interface (SASI), allowing a direct and instant interconnection between rigid and soft electronics.

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Background: Hypovolemic shock can lead to life-threatening organ dysfunction, and adequate fluid administration is a fundamental therapy. Traditionally, parameters such as vital signs, central venous pressure, and urine output have been used to estimate intravascular volume. Recently, pulse pressure variation (PPV) and non-invasive cardiac monitoring devices have been introduced.

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Transistors with inorganic semiconductors have superior performance and reliability compared to organic transistors. However, they are unfavorable for building stretchable electronic products due to their brittle nature. Because of this drawback, they have mostly been placed on non-stretchable parts to avoid mechanical strain, burdening the deformable interconnects, which link these rigid parts, with the strain of the entire system.

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Introduction: A residual fracture gap after intramedullary nailing is a known risk factor for delayed union and non-union. This study aimed to report the outcomes of a forward-striking technique to reduce fracture gaps during long cephalomedullary nailing in subtrochanteric femoral fractures (SFFs).

Methods: A retrospective cohort study was conducted on patients with SFFs treated in a single institution between February 2013 and October 2018.

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Background: Tapered modular stems are increasingly used in revision total hip arthroplasty (THA) with deficient femoral bone stock. This study aimed to report the long-term outcomes of revision THA using a tapered and fluted modular stem.

Methods: Between December 1998 and February 2006, 113 revision THAs (110 patients) were performed with a tapered and fluted modular stem at a single institution.

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Nanozyme-based dye degradation methods are promising for the remediation of water pollution. Though Pd nanoparticles (PdNPs) are known to act as nanozymes, their dye degradation capability has not been investigated. Low nanozyme activities, easy aggregation, difficulties in recovery and reuse are the major challenges in achieving this.

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Article Synopsis
  • Early detection of bone tumors in the proximal femur is essential for effective treatment, prompting this study to develop an AI model for classification using plain radiographs.
  • The study used 538 hip radiographs, training a deep learning model to differentiate between benign, malignant, and tumor-free images, achieving a high diagnostic accuracy of 0.853 compared to the average accuracy of four human doctors.
  • The AI model showed superior performance with a high AUROC score (0.953), indicating its potential to lessen diagnostic errors, especially by non-specialist doctors in the field of musculoskeletal oncology.
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We have modified the ion-exchange affinity of nano-Hydroxyapatite (Ca(PO)OH, HAP) surface for the rapid and selective adsorption of Sr from groundwater. The modification was achieved by the post-substitution of cations (Na, Mg, Cu, Ba, Fe, and Al) for parent Ca within surface structure of HAP. The diffraction patterns of modified HAP showed a slight shift of the (002) peak between 25° and 27° 2θ depending the ionic radius of the substituted cation.

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