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      • KCI등재

        METHOD FOR CONTROL OF STEERING ANGLES FOR ARTICULATED VEHICLES USING VIRTUAL RIGID AXLES

        문경호,장서기,이수호,박태원,목재균 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.4

        Many methods we have been developed to control the rear wheels of a vehicle, but most of them are designed for automobiles with four wheels. The AWS (all wheel steering) control method for articulated vehicles is currently applied only to Phileas vehicles developed by APTS, but the control algorithm for this system has yet to be reported. In the present paper, a new algorithm is proposed after the AWS ECU (electronic control unit) of the Phileas vehicle was tested and analyzed in order to understand the existing steering algorithm. The new algorithm considers the vehicle geometry, stability of handling, and safety, and can be easily applied to multi-axle vehicles. In order to verify the AWS algorithm, the trajectory and steering angles of each algorithm were compared using the commercial software ADAMS. Turning radius, swing-out, and swept path width were also investigated to determine the turning performance of the proposed algorithm.

      • KCI등재

        NexGen®-LPS를 이용한 인공 슬관절 전치환술: 최소 5년 추시 결과

        문경호,이동주,이중선,김영태 대한정형외과학회 2011 대한정형외과학회지 Vol.46 No.5

        Purpose: One hundred and thirty-six patients who underwent total knee replacement arthroplasty (TKRA) with NexGen®-LPS were analyzed for the clinical and radiologic results after a minimum follow-up of 5-years. Materials and Methods: This study included 136 patients (209 knees) who underwent TKRA with NexGen®-LPS between August 1998 and February 2005 and had a minimum follow-up of 5 years. We evaluated the range of motion (ROM), American Knee Society knee functional scores, radiographic results and complication rates in the study subjects with an average 8.3 years of follow-up (range: 5-11.5 years). We also compared the results of the degenerative arthritis group (195 knees in 129 patients) with those of the rheumatoid arthritis group (14 knees in 7 patients). Results: The mean ROM increased from 107.3o to 122o at the fi nal follow-up. The fl exion contracture also improved from 8.3o to 1.2o at fi nal follow-up. The knee score improved from 51 to 94.7 at the fi nal follow-up. The functional score improved from 38 to 84.2 (p<0.05) at fi nal follow-up. There was no statistical signifi cant difference in the results between the degenerative arthritis and rheumatoid arthritis groups (p>0.05). Valgus (α), varus (β), fl exion (γ) and the posterior slope angle (δ) of the tibial components were well maintained both during the immediate postoperative period and at the fi nal follow-up. There was no signifi cant difference in the tibiofemoral angle and α, β, γ and δ angle (p>0.05) between the degenerative arthritis and rheumatoid arthritis groups. The alignment of the alternative substance was also relatively well maintained. Radiolucent lines were observed in 39 knees (18.7%),and in 42 zones out of 209 knees. The most common site of radiolucent lines was the medial side of the tibia in 21 knees. The overall incidence of radiolucent lines was 15% for the femur, 61% for the tibia and 24% for the patella. There was no statistically signifi cant difference between the presence of radiolucent lines and the clinical results (p>0.05). There was 1 case of revision surgery due to loosening of implants at 8 years after surgery, but no early loosening was observed in the study subjects. Complications were found in 6 patients. Two patients with early postoperative infection were treated with revision surgery. Two patients with acute hematogenous infection 4 years after the initial operation were treated with revision surgery. Two patients with superfi cial infection were treated with antibiotics and regular dressing. Conclusion: The patients treated with the NexGen®-LPS TKRA had a decreased level of postoperative pain and an improved knee joint ROM. A lower rate of complications was also found with this type of implant. 목적: NexGen®-LPS 기구를 사용한 인공 슬관절 전치환술 시행 후 최소 5년 이상의 중장기 추시 결과를 임상적 및 방사선학적으로 분석평가하였다. 대상 및 방법: 1998년 8월부터 2005년 2월까지 NexGen®-LPS 인공 슬관절 전치환술을 시행 받고 최소 5년 이상 추시가 가능하였던 136명, 209슬관절을 대상으로 하였으며, 추시 기간은 평균 8년 3개월(5-11.5년)이었고 미국 슬관절 학회의 평가기준에 따라 슬관절 점수, 기능 점수 및 방사선학적 평가를 하였다. 퇴행성 관절염 환자군(129명, 195예) 및 류마티스 관절염 환자군(7명, 14예)의 결과를 서로 비교, 분석하였다. 결과: 운동 범위는 술전 평균 107.3o에서 술후 평균 122o로, 굴곡 구축은 술전 평균 8.3o에서 술후 평균 1.2o로 호전 되었다. 미국 슬관절 학회의 슬관절 점수는 술전 평균 51점에서 술후 94.7점으로, 기능점수는 술전 평균 38점에서, 술후 평균 84.2으로 향상 되었다. 퇴행성 관절염군과 류마티스 관절염군의 결과 비교에서는 통계학적 유의성은 없었다(p>0.05). 대퇴골 치환물의 외반각(α), 내반각(β), 굴곡각(γ), 후방경사각(δ)은 수술 직후와 최종 추시와의 각도는 비교적 잘 유지되었으며 통계학적 유의성은 없었다. 퇴행성 관절염과 류마티스 관절염을 비교할 때 대퇴-경골간 각 및 α, β, γ 그리고 δ각은 서로 유의한 차이가 없었으며(p>0.05), 치환물의 위치와 정렬은 잘 유지되었다. 방사선투과선은 총 209예 중 39예(18.7%), 총 42구역에서 관찰되었다. 그 중 전후면상 경골의 내측이 총 21예(50%)로 가장 많았으며, 각각의 빈도는 대퇴골에서 15%, 경골에서 61%, 슬개골에서 24%로 나타났으며, 이러한 방사선투과성 선의 유무와 임상적 결과와는 통계적으로 유의한 상관관계가 없었다(p>0.05). 치환물의 해리에 의한 재치환술을 시행한 1예가 있었으며 조기 실패의 예는 없었다. 합병증으로는 초기 수술 후 감염이 2예 있어 재치환술을 시행하였고, 수술 후 4년째 급성 혈행성으로 감염된 2예가 있어 재치환술을 시행하였다. 표재성 감염이2예 있었으며 항생제와 소독으로 치료되었다. 결론: NexGen®-LPS 인공 슬관절 전치환술은 수술 후 통증감소 및 슬관절 운동범위 등의 기능 회복에 양호한 결과를 보였으며, 낮은 합병증의 발생률을 보였다.

      • KCI등재

        Total Knee Replacement Arthroplasty with Buechel and Pappas Knee: Minimum 2-Year Follow-up

        문경호,홍승현,홍택호 대한정형외과학회 2015 Clinics in Orthopedic Surgery Vol.7 No.1

        Background: Clinical and radiologic evaluation and analyses of the surgeries using Buechel and Pappas (B-P) knee implants. Methods: The study was conducted on 60 patients who underwent 94 total knee replacement arthroplasty with B-P knee implantsfrom May 2009 to December 2010. The results were compared to the results of 41 patients who underwent 60 knee joint surgeriesusing NexGen-LPS implants from January 2008 to August 2009. Results: The American Knee Society score of the B-P knee group increased from an average of 66.9 (clinical score) and 65.5(functional score) to 93.4 and 90.3, respectively; while those for the NexGen-LPS group increased from an average of 68.8 (clinicalscore) and 62.4 (functional score) to 86.3 and 76, respectively. The average ranges of motion of the B-P knee group and the Nex-Gen-LPS group were 119.1° and 114.8°, respectively, before surgery and improved to 121.0° and 123.0° at final follow-up after thesurgery. The visual analogue scale scores for the B-P knee group and the NexGen-LPS group improved from 4.7 and 4.6 to 1.4 and 1.8,respectively. The flexion contracture also improved from 5.1° and 6.3° to 0.64° and 1.72°. The tibio-femoral angle for the B-P kneegroup and the NexGen-LPS group also improved greatly after the surgery, from varus 0.34° and 0.73° each to valgus 6.7° and 6.9°,respectively. Conclusions: The evaluation of more than 2 years of total knee replacement arthroplasty using B-P knee implants showed goodresults. B-P knee implants showed a relatively higher degree of satisfaction in clinical knee score and less intraoperative bonemass removal than NexGen-LPS implants.

      • KCI등재
      • KCI등재

        The Usefulness of Three-dimensional Computed Tomography as an Assessment of Periacetabular Osteolysis in Revision Total Hip Arthroplasty

        문경호,강준순,원만희,박명주,최재황 대한고관절학회 2015 Hip and Pelvis Vol.27 No.2

        Purpose: This study was performed to determine the usefulness of three-dimensional computed tomography (3D-CT) in measuring periacetabular osteolysis by comparing the real volume of osteolysis in revision surgery. Materials and Methods: Twnety-three patients who had undergone revision surgery due to periacetabular osteolysis but not included septic osteolysis and implant loosening. The mean age of patients at the time of surgery was 55.2 years. And the mean time interval between the primary total hip arthroplasty and revision surgery was 13.3 years. We measured the polyethylene wear in plain radiographs using computer assisted vector wear analysis program, the volume of acetabular osteolytic lesions in high-resolution spiral CT scans using Rapidia 3D software version 2.8 algorithms before the revision surgery were performed. Intraoperative real osteolytic volume was calculated as the sum of the volumetric increments of the acetabular cup and impacted allo-cancellous bone volume. Results: Strong correlation was found between the volume of acetabular osteolytic lesions measured on 3D-CT and intraoperative real osteolytic volume which was calculated as the sum of the volumetric increments of the acetabular cup and impacted allo-cancellous bone volume. Conclusion: 3D-CT is considered a useful method for assessing and measuring the volume of periacetabular osteolysis before revision surgery.

      • KCI등재

        Medical Treatment of Ankylosing Spondylitis

        문경호,김영태 대한고관절학회 2014 Hip and Pelvis Vol.26 No.3

        The diagnosis of ankylosing spondylitis is often delayed due to ambiguous clinical manifestations and strictdiagnostic criteria. However, imaging techniques such as magnetic resonance imaging have been found effectivefor the early diagnosis of non-radiographic sacroiliitis. New tumor necrosis factor alpha (TNF-α) inhibitors havegood efficacy for patients with persistently high disease activity despite conventional nonsteroidal antiinflammatorydrug treatment. Thus, early diagnosis and aggressive treatments are essential for ankylosingspondylitis patients. Because many patients complain of musculoskeletal pains, especially around the sacroiliacjoint area, hip specialists should be informed of up-to-date knowledge. In this review, we discuss new diagnosticcriteria for ankylosing spondylitis, administration methods of TNF-αinhibitors, and the long-term follow-upresults for patients treated with TNF-αinhibitors.

      • KCI등재

        Degeneration of Acetabular Articular Cartilage to Bipolar Hemiarthroplasty

        문경호,강준순,이동주,이상협,최성욱,원만희 연세대학교의과대학 2008 Yonsei medical journal Vol.49 No.5

        Purpose: This study examined the rate of degeneration of acetabular cartilage by the bipolar head according to time, and also which clinical factors are related to the degeneration of acetabular cartilage. Materials and Methods: Among 192 patients (226 hip joints) who received bipolar hemiarthroplasty from August 1996 to August 2002, 61 patients (65 hip joints) were enrolled in this study, who were followed up for more than 2 years and showed no signs of dislocation, infection, or functional problems. A modified form of a computer assisted vector wear analysis program was used to measure the rate of degeneration of the acetabular cartilage. The factors that appeared to affect the rate of acetabular degeneration in the two groups was evaluated. Results: The average linear degenerative change in the acetabular cartilage and the volumetric degenerative change were 0.23±0.107mm/year and 114±47.2mm(3)/year, respectively. The result showed significant differences in activity and HHS between the 2 groups. The HHS showed a reverse relationship with the linear degeneration and volumetric degeneration, and the activity showed a correlation with the linear and volumetric degeneration. Conclusion: The acetabular cartilage degenerates faster as the patient’ activity increases, and slower with a higher HHS. When surgeons perform hip joint arthroplasty, it is strongly recommended that the life expectancy and the level of activity should be considered when deciding between a hemiarthroplasty and total hip arthroplasty.

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