치면열구전색재료의 개발에 따른 경도측정에 관한 비교실험연구

정영복,신승철 대한예방치과·구강보건학회 1995 大韓口腔保健學會誌 Vol.19 No.3

반복부하가 후방십자 재건인대에 미치는 생역학적 영향 - Inlay 방법과 Transtibial 방법간의 비교 -

정영복,김부섭,진휘재,양동렬,이상학 대한정형외과학회 2002 대한정형외과학회지 Vol.37 No.4

인공슬관절 성형술

정영복 대한슬관절학회 1989 대한슬관절학회지 Vol.1 No.1

The art and science of total knee arthroplasty(TKA) has come a long way in the last 15 years. TKA has become highly regarded and frequently recommended procedure. However, some of the uncertainties of the past about selection of design and also some of the technical controversy continue today. When we are doing TKA, we have to strictly follow up the principles of TKA. The principle of TKA include 1) alignment of the knee in the anteroposterior, lateral and coronal planes; 2) proper soft tissue balance of the medial, lateral, and posterior capsular structures so the joint is stable in both flexion and extension; 3) good cement technique which allow 2-5 mm of cement penetration into cancellous bone; and 4) accurate alignment of the quadriceps mechanism so the patella rides in the femoral groove. If the principles of technique are respected, the narrow limits for margin of error can be met. To provide optimal results, the following measures are recommended. The tibia should be cut no more than 5 mm from the medial subchondral bone, if posterior cruciate ligament is sacrificed, and between 5 mm and 8 rnm, if the posterior cruciate is saved. Fill a defect as necessary with bone graft. The tibia should be cut 90˚ to its axis in the medial-lateral plane and with 2-5˚ posterior tilt. Maintain the anterior-posterior height of the femur to ensure flexion stability. Use the distal femur as the adjustment cut even if the joint line is elevated. If the posterior cruciate ligament tension is tight, lengthen the ligament or convert to a sacrificing design or sacrificing the ligament. Deformity should be corrected with soft tissue release and not angular bone cuts. The patella cut should be performed so that the result is a symmetrical patella that is not increased from its anatomical height. If these principles are followed, the instrumentation use and order of osteotomy of the distal femur or tibia do not matter. The major mechanism of failure in TKA are loosening, instability, sepsis, extensor mechanism power loss, poor range of motion, bone fracture. These are, for the most part, within the surgeon's control. Prosthetic alignment is the most important factor influencing postoperative loosening and instability. Clinical results with current resurfacing components TKA rival or exceed those obtained with conventional total hip replacement in properly selected patients. According recent literatures, the survivorship is over 94% 11 years after operation.

관절경적 후방십자인대 재건술에 있어서 Transtibial Two Tunnel방법과 Modified Tibial Inlay방법의 비교

정영복,태석기,염재광,구본호,Jung, Young Bok,Tae, Suk Kee,Yum, Jae Kwang,Koo, Bon Ho 대한관절경학회 1998 대한관절경학회지 Vol.2 No.2

From 1989 to 1994, authors have reconstructed the posterior cruciate ligament(PCL) in 51 knees with an autogenous central one-third of the patellar tendon by transtibial two tunnel technique, but there were not a few cases of unfavorable results. So from January 1995, we have reconstructed the PCL deficient knees by "modified tibial inlay technique" to avoid the grafted tendon abrasion at the posterior opening of the tibial tunnel(killer turn). Purpose of this study was to compare the results of two surgical techniques and what its advantages and disadvantages are. We could follow up 39 cases of transtibial two tunnel techique group(group A) more than one year, average being 23.7 months and 21 cases of modified tibial inlay technique group(group B) more than 12 months, average being 14.7 months. The clinical results were evaluated by the OAK knee scoring system ($M{\ddot{u}}ller$'s criteria) and the posteror stress roentgenography (push view) with Telos stress device compared with the uninjured knees. The arthroscopic second-look findings were also evaluated. In group A : The $M{\ddot{u}}ller$'s knee score was average 80.1 points, the posteror displacement in push view was average 4.4mm at the last follow up. There were 17 cases(44%) of unfavorable results which showed unstable posterior displacement more than 4mm compared with the uninjured knee in push view. Among the 19 cases of arthroscopic second look examinations, nearly normal PCL appearances of the grafted tendons were noted only in 9 cases(47%). In group B : The $M{\ddot{u}}ller$'s knee score was average 86.7 points, the posterior displacemnet in push view was average 3.6mm at the last follow up. There were 5 cases(23.8%) of unfavorable results which showed unstable posterior displacement more than 4mm compared with the uninjured knee in push view but 4 out of 5 cases showed 6mm posterior displacement in push views. Among the 7 cases of arthroscopic second-look examinations, 6 cases(86%) showed nearly normal PCL appearances of the grafted tendons. In modified tibial inlay technique of PCL reconstruction, it was easier to pull out the BPTB and in cases of remained laxed meniscofemoral ligament it was easier to preserve the remained structures than transtibial two tunnel technique. We expect the "modified tibial inlay technique" may solve the problem of grafted patellar tendon abrasion at the posterior orifice of tibial tunnel and may contribute to the successful PCL reconstruction.

토끼에서 후방십자인대 손상 후 후방십자인대의 기계적 수용기의 변화

정영복,이재성,김경환,Jung Young Bok,Lee Jae sung,Kim Kyoung Hwan 대한정형외과스포츠의학회 2002 대한정형외과스포츠의학회지 Vol.1 No.1

Purpose : To assess the change in the number of mechanoreceptors of posterior cruciate ligament(PCL) after transecting posterior cruciate ligament of the rabbit. Materials and Methods : We selected 10 skeletally-matured New Zealand white rabbits and one of the two posterior cruciate ligaments was transected and the other underwent sham-operation on each rabbit. Afterward, PCLs with synovium were obtained at femoral attach area in both knees in 20 weeks postoperatively, but in one of the cases, the transected PCL did not heal and had to be excluded from this study. Consequently, histologic examination of the ligament for the remaining 9 cases was done after being prepared with modified gold chloride stain. Results : The study showed a little bit more decrease in the number of mechanoreceptors in the transected group compared with that in the sham-operated group, but the number was statistically negligible. Conclusions : It is considered that the knee joint with injured PCL may still maintain proprioception since the decrease in the number of mechanoreceptors is not considerable, but further study on biomechanical role and function of mechanoreceptor of healed PCL is required. 목적 : 토끼후방십자인대의절단뒤후방십자인대의치유와기계적수용기의수적변화에대해관찰하고자하였다. 대상및방법 : 골성숙이완료된열마리의뉴질랜드산흰토끼를 이용하여각각에서양측슬관절중한쪽슬관절에서는후방십자인대를절단하고, 다른한쪽에는샴술기를시행한후20주후에생검하여후방십자인대의치유가이루어진9례에서조직학적검사를시행하여후방십자인대를절단한슬관절과샴술기를시행한슬관절을비교하였다. 결과 : 후방십자인대절단후치유가이루어진조직들에서샴술기를시행하였던조직보다기계적수용기가약간감소한것으로관찰되었으나통계적유의성은없었다. 결론 : 후방십자인대가손상된슬관절에서비록기계적수용기가감소한다할지라도고유감각이유지될수있을것으로사료되나기계수용기의손상된후방십자인대에대한작용과생역학적기능에대해서는좀더연구가이루어져야될것으로사료된다.

관절경을 이용한 전방 십자 인대의 이중 다발 재건술

정영복,박세진,정호중,유재현,Jung, Young-Bok,Park, Se-Jin,Jung, Ho-Joong,Yoo, Jae-Hyun 대한관절경학회 2007 대한관절경학회지 Vol.11 No.2

목적: 관절경을 이용한 전방 십자 인대의 이중 다발 재건술의 수술 방법을 보고하고 단일 다발 재건술과 이중 다발 재건술의 술 후 임상적 결과 대해 비교하려고 한다. 대상 및 방법: 2005년 5월부터 2006년 5월까지 전방 십자 인대의 손상으로 진단된 총 98예의 환자 중 전방 십자 인대 단독 손상이었던 61예를 대상으로 전향적인 연구를 시행하였다. 수술 전과 수술 후 연속적으로 안정성 및 임상적 결과를 검사하였으며 술 전과 술 후 1년째 자료를 이용하여 단일 다발 재건술의 결과와 이중 다발 재건술의 결과를 비교하였다. 단일 다발 재건술 환자는 총 30예였으며 이중 다발 재건술 환자는 총 31예이었다. 안정성 검사로는 Telos를 이용한 전방 전위 방사선 사진과 KT-2000 arthrometer을 이용하여 분석하였고, 임상적 결과로는 IKDC(International Knee Documentation Committee) 점수와 OAK(Orthopadische Arbeitsgruppe Knie) 점수 및 관절 운동 범위와 대퇴 사두근의 둘레를 확인하였다. 모든 수술은 한 명의 술자에 의해 시행되었다. 결과: 술 전 Telos를 이용한 전방 전위 방사선 사진과 KT-2000 arthrometer를 이용한 안정성에 있어서 단일 다발 재건술 환자군에서는 각각 $7.9{\pm}3.3$과 $7.4{\pm}2.0$, 이중 다발 재건술 환자군에서는 $8.3{\pm}3.5$와 $7.9{\pm}3.2$로 확인되었다. 술 후 1년째 시행한 검사에서는 단일 다발 재건술 환자군에서 각각 $1.9{\pm}1.2$와 $2.2{\pm}1.6$, 이중 다발 재건술 환자군에서 $1.1{\pm}0.9$와 $1.0{\pm}1.0$으로 이중 다발 재건술을 시행한 군이 우수하게 나타났으며 그 결과는 통계적으로 유의하였다. 그러나, IKDC(International Knee Documentation Committee) 와 OAK(Orthopadische Arbeitsgruppe Knie) 점수 및 대퇴사두근 둘레와 관절 운동 범위에서는 두 군 사이에 차이를 확인할 수 없었다. 결론: 안정성의 측면에서 볼 때, 전방 십자 인대의 이중 다발 재건술은 단일 다발 재건술보다 술 후 더 우수한 결과를 나타내었으며 통계적으로 의미가 있었으나 그 외 다른 임상적 결과는 두 군에서 차이를 확인할 수가 없었다. Purposes: The purpose of this study was to report surgical technique of double bundle anterior cruciate ligament(ACL) reconstruction and to compare the short-term clinical results between arthroscopic single-bundle and double-bundle ACL reconstruction. Materials and Methods: From May 2005 to May 2006, ninety-eight patients were underwent ACL reconstruction. We designed prospective study with sixty-one patients who were revealed isolated ACL injury. We serially checked clinical and radiologic data preoperatively and postoperatively. We compared single-bundle with double-bundle ACL reconstruction patients with preoperative datas and postoperatively 1-year data. There were 30 single bundle reconstruction and 31 double bundle reconstruction. Stability was assessed objectively by anterior stress radiographs with the $Telos^{(R)}$ device and the maximal manual test with the KT-2000 arthrometer. The clinical results were assessed by IKDC(International Knee Documentation Committee) and OAK(Orthopadische Arbeitsgruppe Knie) scores. Also, we evaluated postoperative thigh circumference and range of motion. All of operations were done by only one surgeon. Results: At single-bundle reconstruction group, preoperative AP instability which was checked by $Telos^{(R)}$ device and the maximal manual test with the KT-2000 arthrometer was $7.9{\pm}3.3$ and $7.4{\pm}2.0$, respectively. At double-bundle reconstruction group, it was $8.3{\pm}3.5$ and $7.9{\pm}3.2$, respectively. Residual AP laxity checked at 1 year after operation was $1.9{\pm}1.2$ and $2.2{\pm}1.6$ in single-bundle reconstruction group, and $1.1{\pm}0.9$ and $1.0{\pm}1.0$ in double-bundle reconstruction group. So, double-bundle reconstruction had better results in both anterior stress radiographs with the $Telos^{(R)}$ device and the maximal manual test with the KT-2000 arthrometer, and there were significant differences in statistics. But, clinical results such as IKDC(International Knee Documentation Committee) scores, OAK(Orthopadische Arbeitsgruppe Knie) scores, thigh circumference and range of motion had no significant difference between two groups. Conclusions: On the basis of stability, the side-to-side anterior laxity of double-bundle ACL reconstruction was significantly better than that of single-bundle reconstruction, although there were no significant differences in the other clinical measures among them.

Computation of Hankel matrices in terms of classical kernel functions in potential theory

정영복 대한수학회 2020 대한수학회지 Vol.57 No.4

In this paper, we compute the Hankel matrix representation of the Hankel operator on the Hardy space of a general bounded domain with respect to special orthonormal bases for the Hardy space and its orthogonal complement. Moreover we obtain the compact form of the Hankel matrix for the unit disc case with respect to these bases. One can see that the Hankel matrix generated by this computation turns out to be a generalization of the case of the unit disc from the single simply connected domain to multiply connected domains with much diversities of bases.

골-슬개건-골 및 슬괵건을 이용한 전방 십자 인대 재건술의 비교 - 술후 슬관절의 기능, 안정성 및 대퇴, 경골터널 확장정도에 대하여 -

정영복,태석기,임정일,Jung Young Bok,Tae Suk-Kee,Lim Jung Il 대한관절경학회 2000 대한관절경학회지 Vol.4 No.1

목적 : 자가이식건을 이용한 전십자인대 재건술에 있어서 골-슬개건-골과 슬괵건을 사용하고 그 결과를 서로 비교하고자 함에 있다. 대상 및 방법 : 1996년 1월부터 1999년 7월까지 골-슬개건-골을 이용한 군 32례, 슬괵건을 이용한 군 18례를 대상으로 하였고 평균 추시기간은 각 각 18 개월, 15 개월이었으며 기능, 안 정성 경골과 대퇴골 터널의 확장정도를 평가하였다. 결과 : 기능적인 평가에서 OAK(Orthopadishe Arbeitsguppe Knie) 점수는 슬개건을 사용한 군에서 술 전평균 71.6점$({\pm}10.0)$, 최종 추시점에서 88.5점$({\pm}7.9)$이었고 슬괵건을 사용한 군에서는 술 전 평균 73.9점$({\pm}11.5)$, 최종 추시점에서 82.5점$({\pm}12.9)$이었으며 IKDC(international Knee Documentation Committee)상 B군 이상의 결과를 보인 군은 슬개건을 사용한 경우 28례$(87\%)$, 슬괵건을 사용한 경우가 10례$(55\%)$였다. 안정성은 $KT-1000^{TM}$을 사용한 최대 도수 변이 검사에서 건측과 환측의 차이가 슬개건을 사용한 경우 술 전 평균6.5$({\pm}4.0)$mm, 최종 추시점에서 2.4$({\pm}1.8)$mm를, 슬괵건을 사용한 경우는 6.6$({\pm}2.9)$mm에서 2.3$({\pm}2.4)$mm를 보였다. 부하 방사선 사진상 전위는 각각 술 전 평균 8.0$({\pm}4.8)$mm, 7.0$({\pm}4.3)$mm에서 최종 추시점에서 2.8$({\pm}3.4)$mm, 2.8$({\pm}2.5)$mm의 차이를 나타냈다. 터널의 확장 정도는 대퇴골 터널의 경우에서 슬괵건을 사용한 군이 술 전 평균 9.6$({\pm}1.4)$mm, 최종 추시점에서 10.8$({\pm}1.0)$mm를 나타내어 슬개건을 사용한 경우보다 더 유의하게 확장되었다(p=0.03). 결론 : 두 군간에 술 후 안정성에서는 차이를 보이지 않아 슬개-대퇴 관절 동통, 골연령 및 미용상의 문제 등을 종합적으로 고려하여 이식건은 선택되어야하고, 터널확장을 줄이면 두 군의 안정성을 보다 향상시킬 수 있을 지는 대조군을 이용한 더 많은 연구가 필요할 것으로 보인다. Purpose : The purpose of this study was to compare the results of ACL reconstruction using bone-patellar tendon-bone to hamstring. Materials and Methods : Thirty-two ACL reconstructions with autogenous BPTB and eighteen reconstructions with hamstring were compared in terms of functional outcome, stability and tunnel expansion. Results : The functional score of BPTB group was higher than hamstring group in OAK(Orthopadishe Arbeitsguppe Knie) and IKDC(International Knee Documentation Committee) system. In BPTB group, OAK scores were 71.6$({\pm}10.0)$ preoperatively and 88.5$({\pm}7.9)$ finally. In hamstring group, OAK scores were 73.9$({\pm}11.5)$ and 82.5$({\pm}12.9)$ respectively. There was no difference in stability checked by either $KT-1000^{TM}$ or stress view. Anterior tibial translation measured by $KT-1000^{TM}$ were 2.4$({\pm}1.8)$mm in BPTB and 2.3$({\pm}2.4)$mm in hamstring group. Anterior tibial translation in stress view were 2.8$({\pm}3.4)$mm in BPTB and 2.8$({\pm}2.5)$mm in hamstring group. There was no difference in tibial tunnel expansion but femoral tunnel was more enlarged in hamstring group than BPTB (P=0.03). Conclusion : As there was no difference in stability between two groups, it seems prudent to select either graft defend on such factors as anterior knee pain, skeletal maturity and cosmetic concern. Tunnel expansion seems not to affect stability, but further study is needed to confirm that decrease of which might improve stability.

Special orthonormal basis for L2 functions on the unit circle

정영복 대한수학회 2017 대한수학회보 Vol.54 No.6

We compute explicitly the matrices represented by Toeplitz operators on the Hardy space over the unit circle with respect to a special orthonormal basis constructed by author in terms of their symbols. And we also find a necessary condition for the matrix generated by the product of two Toeplitz operators with respect to the basis to be a Toeplitz matrix by a direct calculation and we finally solve commuting problems of two Toeplitz operators in terms of symbols. This is a generalization of the classical results obtained regarding to the orthonormal basis consisting of the monomials.

Toeplitz Operators on Hardy and Bergman spaces over bounded domains in the plane

정영복,나희경 호남수학회 2017 호남수학학술지 Vol.39 No.2

In this paper, we show that algebraic properties of Toeplitz operators on both Bergman spaces and Hardy spaces on the unit disc essentially generalizes on arbitrary bounded domains in the plane. In particular, we obtain results for the uniqueness property and commuting problems of the Toeplitz operators on the Hardy and the Bergman spaces associated to bounded domains.