Sang-Wook Ryu

Yonsei University, Sŏul, Seoul, South Korea

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Publications (6)16.72 Total impact

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    ABSTRACT: Background: We compared the clinical outcomes of nonsmokers, current smokers, and former smokers following reconstruction of the anterior cruciate ligament (ACL) and investigated the association between the amount of smoking and outcomes following ACL reconstruction.METHODS: We retrospectively reviewed the records of 251 patients who underwent unilateral ACL reconstruction with use of bone-patellar tendon-bone autograft between January 2002 and August 2009. Patients were divided into three groups according to smoking history: Group 1, nonsmokers; Group 2, current smokers; and Group 3, former smokers. Preoperative values and twenty-four-month postoperative findings were compared among the groups. The stability of the ACL was evaluated with use of the Lachman test and the pivot-shift test, and anterior translation was tested with a KT2000 arthrometer. Functional outcomes were assessed on the basis of the Lysholm score and the International Knee Documentation Committee (IKDC) subjective score and objective grade.RESULTS: The three groups differed significantly in terms of postoperative knee translation, Lysholm score, and IKDC subjective score. The mean side-to-side difference in anterior translation (and standard deviation) was 2.08 ± 1.08 mm in Group 1 (nonsmokers), 2.65 ± 1.31 mm in Group 2 (smokers), and 2.15 ± 1.05 mm in Group 3 (former smokers) (p = 0.003). The mean Lysholm score was 90.5 ± 6.5 in Group 1, 86.0 ± 7.1 in Group 2, and 89.8 ± 6.3 in Group 3 (p < 0.001). The mean IKDC subjective score was 89.3 ± 5.1 in Group 1, 84.9 ± 7.5 in Group 2, and 88.5 ± 4.2 in Group 3 (p < 0.001). However, the difference in the IKDC subjective score among the three groups did not demonstrate a minimal clinically important difference. A dose-dependent association was noted between pack-years of exposure and postoperative anterior translation (estimate, 0.039; p = 0.015) and IKDC objective grade (odds ratio, 1.083; p = 0.002). A comparison of the three subgroups of smokers showed a significant difference in anterior translation (a mean side-to-side difference in anterior translation of 2.31 ± 1.17 mm for the light smokers, 2.60 ± 1.14 mm for the moderate smokers, and 3.29 ± 1.55 mm for the heavy smokers; p = 0.038). The three subgroups also differed significantly in terms of the proportion of cases by IKDC objective grade; among the light smokers, thirteen (42%) were grade A, fifteen (48%) were grade B, two (7%) were grade C, and one (3%) was grade D; among the moderate smokers, seven (35%) were grade A, eight (40%) were grade B, four (20%) were grade C, and one (5%) was grade D; and among the heavy smokers, one (6%) was grade A, eight (44%) were grade B, eight (44%) were grade C, and one (6%) was grade D (p = 0.013).CONCLUSIONS: Cigarette smoking appeared to have a negative effect on subjective and objective outcomes of ACL reconstruction, and heavy smokers showed greater knee instability. Patients who had stopped smoking at least one month prior to ACL reconstruction had no significant difference in outcomes compared with patients who had never smoked.LEVEL OF EVIDENCE: Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.
    The Journal of Bone and Joint Surgery 06/2014; 96(12):1007-1013. DOI:10.2106/JBJS.M.00598 · 5.28 Impact Factor
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    ABSTRACT: This study compared the long-term clinical and radiological outcomes, according to the extent of arthroscopic meniscectomy, of complete and incomplete types of the discoid lateral meniscus. A total of 125 discoid menisci (74 complete and 51 incomplete types) without significant cartilage erosion at the time of surgery were included. The extent of meniscectomy was decided along with tear patterns and the stability of the discoid meniscus. Both clinical and radiological results were evaluated after total or partial meniscectomy. In the complete type of discoid meniscus with less than 5 years of follow-up, the total meniscectomy group showed better clinical results than the partial meniscectomy group. However, with over 5 years of follow-up, there were no differences between the two groups. In the radiological results, there was no significant difference between the two groups during the first 5 years after operation. However, with more than 5 years of follow-up, the partial meniscectomy group showed better results than the total meniscectomy group. In the incomplete-type discoid meniscus, clinical results were better in the partial meniscectomy group regardless of the follow-up periods. In the radiological results, the partial meniscectomy group showed better results for only more than 5 years of follow-up. The long-term prognosis after arthroscopic meniscectomy for the torn discoid lateral meniscus was related to the volume of the meniscus removed.
    Knee Surgery Sports Traumatology Arthroscopy 12/2007; 15(11):1315-20. DOI:10.1007/s00167-007-0391-z · 3.05 Impact Factor
  • Sung-Jae Kim · Jae-Hoon Jeong · Yong-Min Cheon · Sang-Wook Ryu
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    ABSTRACT: Abstract Clinical features of the symptomatic mediopatellar plica (MPP) are nonspecific and the diagnosis has been troublesome for orthopaedic surgeons. We present a diagnostic test for symptomatic MPP.
    Arthroscopy The Journal of Arthroscopic and Related Surgery 01/2005; 20(10):1101-3. DOI:10.1016/j.arthro.2004.08.003 · 3.21 Impact Factor
  • Sung-Jae Kim · In-Seop Park · Yong-Min Cheon · Sang-Wook Ryu
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    ABSTRACT: Abstract Recently, attention has been given to the double-bundle technique for treating the posterior cruciate ligament (PCL)-deficient knee. We present an arthroscopic PCL reconstruction using a double-bundle technique with 3-stranded tibialis posterior (TP) allograft that has not been described before. The anterolateral bundle of the PCL is reconstructed using 2-stranded TP allograft and the posteromedial bundle using 1-stranded TP allograft. Three-stranded TP allograft will be an alternative graft choice for PCL reconstruction.
    Arthroscopy The Journal of Arthroscopic and Related Surgery 01/2005; 20(10):1090-4. DOI:10.1016/j.arthro.2004.08.002 · 3.21 Impact Factor
  • Sung-Jae Kim · In-Seop Park · Yong-Min Cheon · Sang-Wook Ryu
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    ABSTRACT: Posterolateral instability of the knee is known as one of the most challenging injuries. Although several procedures have been designed for the posterolateral instability, there is no gold standard management as yet. We present a technique for posterolateral instability of the knee using a tibialis posterior tendon allograft, which reconstructs the lateral collateral ligament and popliteal tendon with its attachment to the tibia. This can correct not only varus, but also external rotary instability.
    Arthroscopy The Journal of Arthroscopic and Related Surgery 08/2004; 20 Suppl 2(6):195-200. DOI:10.1016/j.arthro.2004.04.042 · 3.21 Impact Factor
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    ABSTRACT: Arthroscopy of the elbow is a very precise and demanding procedure due to the closeness of the recommended portals to neurovascular structures and complexity of articular geometry. So to establish safe portal is not always reproducible especially in case of stiff elbow, even for the experienced arthroscopist. We described new tip of elbow arthroscopy using a new starting portal. This procedure is almost always reproducible even in stiff elbow, and minimizes risk of damage to neurovascular structures.? ??? ??? ??? 攀?? ??? 攀?爀 ??? ??? ?攀? 爀?椀 攀?? ?攀椀? ?? ????㈀? ???J????????? ? ????????渲弱ᆬ?? ?????楯渠獵????瑩癩? ?????敵??椀 1有?財?ᄅ??ᄅ???? ?? ?? ?뻮 ? ?%%? Thesle f쪔?? ??? A? ° Thesleff S, Sellin LC: Denerv쇯 ?돀遠?? ??? ??? ??? ? ?돐 ??? ??? s?? ? ?덐 ??? ? 老 ???? ? ? ? 꼀 촀 ??? ?? 쁬?? ?? ion: The trigger
    01/2003; 6(2). DOI:10.5397/CiSE.2003.6.2.127

Publication Stats

74 Citations
16.72 Total Impact Points


  • 2014
    • Yonsei University
      • Department of Orthopaedic Surgery
      Sŏul, Seoul, South Korea
  • 2004–2007
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea