Robotic Total Knee Arthroplasty with a Cruciate-Retaining Implant: A 10-Year Follow-up Study

양홍연,선종근,신영주,임홍안,송은규 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.2

Background: This study compared clinical and radiological results between robotic total knee arthroplasty (TKA) and conventional TKA with a cruciate-retaining implant at 10-year follow-up. The hypothesis was that robotic TKA would allow for more accurate leg alignment and component placement, and thus enhance clinical and radiological results and long-term survival rates. Methods: A total of 113 primary TKAs performed using a cruciate-retaining implant in 102 patients from 2004 to 2007 were reviewed retrospectively. Of the 113 TKAs, 71 were robotic TKAs and 42 were conventional TKAs. Clinical outcomes (visual analogue scale pain score, Hospital for Special Surgery score, Western Ontario and McMaster University score, range of motion, and complications), radiological outcomes, and long-term survival rates were evaluated at a mean follow-up of 10 years. Results: Clinical outcomes and long-term survival rates were similar between the two groups. Regarding the radiological outcomes, the robotic TKA group had significantly fewer postoperative leg alignment outliers (femoral coronal inclination, tibial coronal inclination, femoral sagittal inclination, tibial sagittal inclination, and mechanical axis) and fewer radiolucent lines than the conventional TKA group. Conclusions: Both robotic and conventional TKAs resulted in good clinical outcomes and postoperative leg alignments. Robotic TKA appeared to reduce the incidence of leg alignment outliers and radiolucent lines compared to conventional TKA.

한국 가전제품의 중국 수출 경쟁력 분석 : 시장점유율지수를 중심으로(MSI)

양홍연(Hong-Yan Liang),이제홍(Je-Hong Lee) 조선대학교 지식경영연구원 2021 기업과 혁신연구 Vol.44 No.3

본 연구 목적은 한국의 대 중국 가전제품 수출현황을 분석함과 아울러 한국 가전제품이 중국시장에서 경쟁력 분석을 위해 시장점유율(MSI) 모형을 활용하여 중국 시장에서 한국과 일본의 가전제품 경쟁력 비교분석하는데 있다. 경쟁력 분석을 통해 한국 가전제품의 점유율 유지를 위해 어떤 경쟁전략을 수립해야 하는지 방안을 모색하는데 연구의 목적이 있다. 분석은 시장점유율지수(MSI) 모형을 이용하였다. 중국시장에서 한국과 일본의 시장점유율에 따른 경쟁관계를 비교 분석한 결과, 2010년~2019년 시장점유율 평균치에 기준으로 한국은 일본보다 시장점유율이 높은 품목이 9개 품목이 있으며, 2019년 시장점유율에 기준으로 한국이 일본 보다 시장점유율이 높은 품목이 7개 품목이 있다. 시장점유율을 기준으로 볼 때, 중국시장에서 가전제품은 한국과 일본이 비슷한 시장점유율을 보이지만 10년간의 변화추이를 살펴보면 일본의 시장점유율은 거의 하락추세가 나타나고 한국은 반수 이상의 품목이 상승하였다. 그러나 본 연구에서 나타났듯이 한국의 가전제품이 일본의 가전제품에 대해 경쟁력에서 앞선 제품이 많아지고 있는 것을 볼 수 있다. This study analyzes Korea"s home appliance exports to China and compares the competitiveness of Korean and Japanese home appliances in the Chinese market by using the market share (MSI) model to analyze the competitiveness of Korean home appliances in the Chinese market. The purpose of this study is to find out what kind of competitive strategy should be established to maintain the market share of Korean home appliances through competitive analysis. The analysis used the market share index (MSI) model. As a result of comparative analysis of the competitive relationship according to market share between Korea and Japan in the Chinese market, based on the average value of market share from 2010 to 2019, Korea had nine items with a higher market share than Japan. Based on this, there are 7 items that Korea has a higher market share than Japan. In terms of market share, Korea and Japan have similar market shares for home appliances in the Chinese market, but looking at the trend over the past 10 years, Japan"s market share has almost declined, and more than half of the items in Korea have risen. However, as shown in this study, it can be seen that Korean home appliances are more competitive than Japanese home appliances.

중국시장에서 한국과 일본 가전제품의 수출경쟁력 분석

양홍연(Hong Yan Liang),이제홍(Je Hong Lee) 국제e-비즈니스학회 2021 e-비즈니스 연구 Vol.22 No.4

Long-term Results of Modified Salter Innominate Osteotomy for Legg-Calvé-Perthes Disease

박경순,조규진,양홍연,Kamolhuja Eshnazarovich Eshnazarov,윤택림 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.4

Background: In a previous study, we reported clinical and radiographic results of our modified Salter innominate osteotomy technique in 16 hips affected by Legg-Calvé-Perthes disease (LCPD) with an average follow-up of 31.8 months. In this study, we present the long-term results of the osteotomy in LCPD patients followed until physeal closure. Methods: Thirty hips of 29 patients were followed until skeletal maturation after modified Salter innominate osteotomy. The mean follow-up duration was 12.9 years (range, 9.1 to 16.0 years). Eleven hips (36.7%) were classified as Catterall group III and 19 (63.3%) as Catterall group VI. Stable interposition of a bone block was achieved using one biodegradable screw in nine hips and without any fixation device in 21 hips by simply changing the direction of osteotomy. The Harris Hip Score (HHS), Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score, and hip function were evaluated at the last follow-up. Radiological outcomes were evaluated using Wiberg’s center-edge angle, the Mose method, and Stulberg classification, and osteoarthritic changes were evaluated using the Tonnis classification. Results: Mean HHS and WOMAC score were 80.2 points and 54 points, respectively, preoperatively and these were improved to 96.2 points and 28 points, respectively, at the last follow-up. Clinical results, according to Robinson’s criteria, were good in 18, fair in seven, and poor in five hips. Radiological results assessed using the Mose method were good in 18, fair in six, and poor in six hips, and according to the Stulberg classification, nine hips were class I, nine were class II, eight were class III, and four were class IV. The mean center-edge angle improved from 19.7° preoperatively to 29.6° at the final follow-up. According the Tonnis classification, three hips were grade 2, five were grade 1, and 22 were grade 0. Of the three grade 2 hips, two underwent Chiari osteotomy 12.1 and 8.8 years postoperatively, and the other underwent total hip arthroplasty 12.9 years postoperatively. Conclusions: The modified Salter innominate osteotomy produced relatively satisfactory long-term clinical and radiological results.

한국 소비자의 중국 소형전자 제품 만족도, 재구매의도와 타인추천에 관한 실증분석

이제홍(Lee, Je Hong),양홍연(Hong Yan, Liang) 한국통상정보학회 2021 통상정보연구 Vol.23 No.3

소비자들은 소형전자제품을 구매하는 경우 어떤 특성들이 만족도에 영향을 미치는지 그리고 미래소형전자제품의 재구매 의도와 타인 추천에 어떠한 의사결정을 내릴 것인지에 대한 연구의 필요성이 제기되고 있다. 본 연구는 한국시장에서 중국 소형전자제품을 구매하는 소비자를 대상으로 제품의 품질, 가격, 편리성, 디자인 그리고 신뢰도가 만족도에 대한 영향을 실증분석하고, 만족도가 재구매 의도와 타인추천 미치는 영향을 실증 분석하고자 한다. 이의 연구를 통해 한국 소비자가 중국 소형전자제품의 만족도에 관한 연구를 하여, 한국 소형전자 제품의 가격경쟁, 품질 경쟁에 대응하는 전략을 수립하는데 도움을 주고자 한다. 요인분석을 통하여 발견된 중국 소형전자제품의 품질, 가격, 편리성, 디자인, 신뢰도 등 제품속성들에 대한 만족도와 전반적인 만족도의 관계를 살펴보면, 품질, 가격, 편리성, 신뢰도 요인은 한국 소비자들의 만족도가 높은 것으로 나타났으면, 반면 디자인 요인은 만족도에 별다른 영향을 미치지 않는 것으로 나타났다. 이는 중국 소형전자제품의 디자인 측면은 한국 소비자들은 고려하지 않은 것이다. 그리고 중국 소형전자제품을 구매한 한국 소비자들의 만족도가 재구매 의도와 타인추천에 모두 정(+)의 영향을 미치고 있으며, 중국 소형전자제품에 대한 재구매 의도가 타인추천에도 긍정적인 영향을 미치고 있다는 것이다. This study empirically analyzes the effects of product quality, price, convenience, design, and reliability on satisfaction among consumers who purchase Chinese small electronic products in the Korean market, and demonstrates the effect of satisfaction on repurchase intention and recommendation by others. I want to analyze Through this study, Korean consumers will study on the satisfaction of Chinese small electronic products to help them establish strategies to cope with price and quality competition of Korean small electronic products. Examining the relationship between satisfaction with product attributes such as quality, price, convenience, design, and reliability of Chinese small electronic products found through factor analysis and overall satisfaction, quality, price, convenience, and reliability factors are related to the satisfaction of Korean consumers. On the other hand, it was found that design factors had no significant effect on satisfaction. This is because Korean consumers did not consider the design aspects of Chinese small electronic products. In addition, the satisfaction level of Korean consumers who purchased Chinese small electronic products has a positive (+) effect on both their repurchase intention and recommendation of others, and the repurchase intention of Chinese small electronic products has a positive effect on recommendation of others.

Causes of Aseptic Persistent Pain after Total Knee Arthroplasty

임홍안,송은교,선종근,박경순,신영주,양홍연 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.1

Background: Persistent pain after total knee arthroplasty (TKA) is dissatisfying to the patient and frustrating to the surgeon. The purpose of this study is to evaluate the aseptic causes and clinical course of intractable pain following TKA. Methods: Of the total 2,534 cases of primary TKA reviewed, 178 cases were classified as having aseptic persistent pain that was not resolved within 1 year after surgery. Except for the cases with periprosthetic fracture (56 knees), 122 cases of aseptic painful TKA were divided into two groups: intra-articular group (83 knees) and extra-articular group (39 knees). Results: In the intra-articular group, the main reasons for pain were aseptic loosening (n = 40), polyethylene wear (n = 16), instability (n = 10), recurrent hemarthrosis (n = 5), patellar maltracking (n = 4), tendon ruptures (n = 4), and stiffness (n = 2). In the extraarticular group, 10 knees (25.6%) were found to have nerve entrapment in the spine, 6 knees (15.4%) were found to have hip osteoarthritis or femoral head avascular necrosis. The reasons for persistent knee pain in the remaining 23 knees (59.0%) still remain elusive. Conclusions: Persistent pain after TKA originated from pathology of extra-articular origin in a considerable number of cases in this study. Therefore, it is important to perform thorough preoperative evaluations to reduce pain resulting from extra-articular causes. Furthermore, meticulous surgical procedures and optimal alignment are required to reduce pain of intra-articular origin related to implant wear, instability, and patellar maltracking.