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Jun-Il Yoo,차용한,Jung-Taek Kim,Chan-Ho Park,Won Sik Choy,Kyung-Hoi Koo 대한정형외과학회 2022 Clinics in Orthopedic Surgery Vol.14 No.2
Because of the increasing global trend of patients with mental disorders, orthopedic surgeons are more likely to encounter orthopedic patients with mental disorders in clinical settings. Identifying the characteristics of these patients and implementing psychiatric management can affect the clinical outcome of orthopedic treatment. Thus, orthopedic surgeons need to assess the psychiatric medical history of orthopedic patients with mental disorders before surgery and understand the psychological and behavioral patterns of patients with mental disorders. In addition, appropriate psychiatric consultations and evaluations are necessary to prevent worsening of mental disorders before and after surgery.
Yoo Jun-Il,차용한,이영균,Ha Yong-Chan,Koo Kyung-Hoi 대한의학회 2022 Journal of Korean medical science Vol.37 No.6
Background: The purpose of this study was to determine whether short tapered stems reduce the rate of thigh pain through a systematic review and meta-analysis of comparative studies between short tapered stems and standard-length tapered stems. Methods: We conducted a meta-analysis of comparative studies: 1) retrospective studies and 2) randomized controlled trials (RCTs), on 2 stem designs: short tapered stem versus standard-length tapered stem. Studies were selected by means of the following criteria: 1) study design: retrospective comparative studies, prospective comparative studies, RCTs; 2) study population: patients with total hip arthroplasty or hemiarthroplasty for hip disease or hip fracture; 3) intervention: short tapered stem and standard tapered stem; and 4) outcomes; thigh pain, other clinical results. Results: Among the 250 articles that were identified at the initial search, 6 studies, 4 RCTs and 2 retrospective comparative studies, were included in this meta-analysis. In the analysis of retrospective studies, the short tapered stem reduced the risk of thigh pain compared to the standard tapered stem (risk ratio [RR] = 0.13; 95% confidence interval [CI], 0.02–0.09; Z = −2.07; P = 0.039). However, in the analysis of RCTs, the incidence of thigh pain was similar between the two stem designs (RR = 1.21; 95% CI, 0.76–1.93; Z = 0.82; P = 0.410). Overall meta-analysis including all studies showed that the short tapered stem did not reduce the incidence of thigh pain compared to the standard-length tapered stem (RR = 0.91; 95% CI, 0.59–1.40; Z = −0.44, P = 0.663). Conclusions: We did not find a significant difference in the incidence of thigh pain between short tapered stem and standard tapered stem in hip arthroplasty.
Osteosarcopenia in Patients with Hip Fracture Is Related with High Mortality
Yoo, Jun-Il,Kim, Hyunho,Ha, Yong-Chan,Kwon, Hyuck-Bin,Koo, Kyung-Hoi The Korean Academy of Medical Sciences 2018 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.33 No.4
<P><B>Background</B></P><P>This study evaluated the prevalence of osteosarcopenia, as well as the relationship between one-year mortality and osteosarcopenia, as defined by criteria of the Asian Working Group on Sarcopenia in patients age 60 or older with hip fracture.</P><P><B>Methods</B></P><P>A total of 324 patients age 60 years or older with hip fracture were enrolled in this retrospective observational study. The main outcome measure was the prevalence of osteosarcopenia, as well as the relationship between osteosarcopenia and 1-year mortality. The diagnosis of sarcopenia was carried out according to the Asian Working Group on Sarcopenia. Whole body densitometry analysis was used for skeletal muscle mass measurement and muscle strength were evaluated by handgrip testing. Mortality was assessed at the end of 1-year. Cox regression analysis was utilized to analyze the risk factor of osteosarcopenia.</P><P><B>Results</B></P><P>Of 324 patients with hip fracture, 93 (28.7%) were diagnosed with osteosarcopenia. In total, 9.0% died during the one-year follow-up. A one-year mortality of osteosarcopenia (15.1%) was higher than that of other groups (normal: 7.8%, osteoporosis only: 5.1%, sarcopenia only: 10.3%). Osteosarcopenia had a 1.8 times higher mortality rate than non-osteosarcopenia.</P><P><B>Conclusion</B></P><P>The present study demonstrates that the prevalence of osteosarcopenia is not rare, and has a higher mortality rate than the non-osteosarcopenia group at the 1-year follow-up period. This is the first study evaluating the relationship between mortality and osteosarcopenia in patients with hip fracture.</P>
Yoo Jun-Il,장석용,Cha Yonghan,Choy Won-Sik,Koo Kyung-Hoi 대한의학회 2021 Journal of Korean medical science Vol.36 No.45
Background: The purpose of this study was to compare the mortality rate between patients undergoing hemiarthroplasty (HA) and those undergoing total hip arthroplasty (THA) in two age groups: patients aged 65–79 years (non-octogenerian) and patients aged ≥ 80 years (octogenarian). Methods: We identified elderly (aged ≥ 65 years) femoral neck fracture patients who underwent primary THA or HA from January 1, 2005 to December 31, 2015 in South Korea using the Health Insurance and Review and Assessment database; the nationwide medical claim system of South Korea. We separately compared the mortality rate between the HA group and THA group in two age groups. A generalized estimating equation model with Poisson distribution and logarithmic link function was used to calculate the adjusted risk ratio (aRR) of death according to the type of surgery. Results: The 3,015 HA patients and 213 THA patients in younger elderly group, and 2,989 HA patients and 96 THA patients in older elderly group were included. In the younger elderly group, the mortality rates were similar between the two groups. In older elderly group, the aRR of death in the THA group compared to the HA group was 2.16 (95% confidence interval [CI], 1.20–3.87; P = 0.010) within the in-hospital period, 3.57 (95% CI, 2.00–6.40; P < 0.001) within 30-days, and 1.96 (95% CI, 1.21–3.18; P = 0.006) within 60-days. Conclusions: In patients older than 80 years, THA was associated with higher postoperative mortality compared to HA. We recommend the use of HA rather than THA in these patients.
A Wearable ECG Acquisition System With Compact Planar-Fashionable Circuit Board-Based Shirt
Yoo, J.,Long Yan,Seulki Lee,Hyejung Kim,Hoi-Jun Yoo IEEE 2009 IEEE transactions on information technology in bio Vol.13 No.6
<P>A wearable electrocardiogram (ECG) acquisition system implemented with planar-fashionable circuit board (P-FCB)-based shirt is presented. The proposed system removes cumbersome wires from conventional Holter monitor system for convenience. Dry electrodes screen-printed directly on fabric enables long-term monitoring without skin irritation. The ECG monitoring shirt exploits a monitoring chip with a group of electrodes around the body, and both the electrodes and the interconnection are implemented using P-FCB to enhance wearability and to lower production cost. The characteristics of P-FCB electrode are shown, and the prototype hardware is implemented to successfully verify the proposed concept.</P>
Yoo, J.,Seulki Lee,Hoi-Jun Yoo IEEE 2009 IEEE journal of solid-state circuits Vol.44 No.11
<P>A near-field coupling transceiver integrated with a fault-tolerant network switch is implemented for inter-layer and intra-layer wearable body area network. The inductive coupling transceiver employs a resonance compensator (RC) with a digitally controlled on-chip capacitor bank and a variable hysteresis Schmitt trigger to compensate dynamic and static variances of woven inductor, and it enables 10 Mbps wireless transaction with the reception energy of 1.12 pJ/b at 2.5 V supply. The network switch introduces new fault-tolerant protocol to eliminate the routing table and reduces power consumption by 70% compared with the conventional switch using torus topology. The transceiver with the switch and the RC are implemented in 0.25-mum 1P5M CMOS process technology, occupying 2.0 mm<SUP>2</SUP> and 0.8 mm<SUP>2</SUP> area, respectively.</P>