Original Article pissn eissn J Korean Soc Spine Surg Jun;20(2): Restoratio

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1 Journal of Korean Society of Spine Surgery Restoration of Lumbar Lordosis After Posterior Lumbar Interbody Fusion with 4 Degree Cage in Degenerative Spinal Disease Kyu-Jung Cho, M.D., Young-Tae Kim, M.D., Seung-Rim Park, M.D., Seung-Hyun Hong, M.D. J Korean Soc Spine Surg 2013 Jun;20(2): Originally published online June 30, 2013; Korean Society of Spine Surgery Department of Orthopedic Surgery, Inha University School of Medicine #7-206, 3rd ST. Sinheung-Dong, Jung-Gu, Incheon, , Korea Tel: Fax: Copyright 2013 Korean Society of Spine Surgery pissn eissn The online version of this article, along with updated information and services, is located on the World Wide Web at: This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

2 Original Article pissn eissn J Korean Soc Spine Surg Jun;20(2): Restoration of Lumbar Lordosis After Posterior Lumbar Interbody Fusion with 4 Degree Cage in Degenerative Spinal Disease Kyu-Jung Cho, M.D., Young-Tae Kim, M.D., Seung-Rim Park, M.D., Seung-Hyun Hong, M.D. Department of Orthopedic Surgery, School of Medicine, Inha University Incheon, Korea Study Design: Retrospective radiological evaluation. Objectives: This purpose of this study is to determine how much lumbar lordosis and disc heights are restored after posterior lumbar interbody fusion (PLIF) with cage in degenerative spinal disease. Summary of Literature Review: Restoration of lumbar lordosis in lumbar spine surgery is crucial for clinical outcomes, but there are few studies about the relationship between restoration of lumbar lordosis and cage. Material and Method: Eighty-one patients with degenerative spinal diseases underwent PLIF using metal cage with 4 o lordotic angle. The mean age was 61 year-old (range years). Cases with late complications including nonunion, subsidence of cage and instrument failure were excluded in this study. Lumbar lordosis, segmental lordosis, disc height, and sagittal alignment were analyzed on radiographs. Results: The fused level was one segment in 62 patients and two segments in 19 patients. All patients had the fusion from L3 to the sacrum. Preoperative lumbar lordosis was 34.2 o, improved to 34.6 o after surgery, and then changed to 32.2 o at the final follow-up, demonstrating that the cage with 4 o lordotic angle was not effective to restore lumbar lordosis. Segmental lordosis at the level of cage decreased at the final follow-up as compared to preoperative value at all segments. Disc height was improved at the final follow-up as compared to preoperative value. Conclusion: Disc height was restored after PLIF using cage in the surgery for degenerative lumbar spine. However, lumbar lordosis and segmental lordosis were decreased at the final follow-up as compared to preoperative lordosis. Key Words: Posterior lumbar interbody fusion, Cage, Lumbar Lordosis, Segmental Lordosis, Disc Height 서론 Cloward 1) 의해도입된후방추체간유합술은퇴행성척추질환의수술적치료방법으로널리사용되고있다. 후방추체간유합술은체중부하의약 80% 가전달되는추체를유합하기때문에후외방유합술이나후방유합술보다는생역학적으로안정된방법이며추간판높이와요추분절의전만각회복에도효과적이라고알려져있다. 또한후방추체간유합술이후방유합술보다소요되는이식골의양이적어서굳이자가장골을채취하지않고국소골만을이식해도되는장점이있다. 2-5) 요추의정상적인전만각은척추에가해지는하중과충격을완화하는역할을하며척추근육이효과적으로작용할수있게한다. 만약이전만각이정상적인형태를벗어나면척추에가해지는하중의분포가고르지못하여몸의균형이무너져환자에게만성적인허리통증의원인이될수있어수술후전만각의회복 Received: April 23, 2012 Revised: July 4, 2012 Accepted: February 25, 2013 Published Online: June 30, 2013 Corresponding author: Kyu-Jung Cho, M.D. Department of Orthopedic Surgery, Inha University Hospital 7-206, 3rd Street Sinheung-Dong, Jung-Gu, Incheon, , Korea TEL: , FAX: chokj@inha.ac.kr This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 본연구는인하대학교연구비지원에의해수행되었음. Copyright 2013 Korean Society of Spine Surgery 51

3 Kyu-Jung Cho et al Volume 20 Number 2 June 2013 Table 1. Change of lumbar lordosis Preop Postop Final Preop-PO Preop-final PO-final Lumbar lordosis (0.71) -2.0 (0.008) -2.4 (0.001) Lumbar lordosis Under 60 y-o (0.163) -2.7 (0.136) -3.2 (0.002) Lumbar lordosis Over 60 y-o (0.591) -1.4 (0.173) -1.4 (0.258) 은환자의예후에있어중요하다고할수있다. 저자들은유합술에필요한자가장골을채취하는공여부부위 의통증이나감염등의합병증을피하기위해, 퇴행성척추질환 에감압술과정에서얻어지는국소골만으로후방추체간유합 술과일측후방유합술을동시에시행하는방법을수년전부터 시행해오고있다. 추체간에는국소골을채워넣은케이지를삽 입하였으며, 초창기에는 4 도의케이지를사용하다가이후 8 도 케이지를주로사용하고있다. 그러나케이지삽입이후에요추 전만각의회복이만족스럽지않은환자들이발견되었다. 특히 초창기에사용한 4 도케이지를삽입한환자에서요추전만각의 교정소실이발견되었다. 정상요추전만각은문헌마다달라평균 도심지어 79 도까지보고되고있지만, 각요추분절각은하부요추로갈수록 증가해서 4-5 요추, 5 요추 -1 천추는각각 20 도, 28 도정도로알 려져있다. 6-7) 현재시중에서후방추체간유합술에사용하는케 이지는대부분전만각이 0 도, 4 도, 8 도로만들어져있으며, 이론 적으로 4 도, 8 도의케이지를사용해서는특히하부요추의요추 전만각을정상치만큼회복할수가없다. 이에저자들은퇴행성척추질환으로케이지를사용한후방 추체간유합술을시행받은환자를후향적으로분석하여요추전 만각과추간판높이가얼마나회복되는가를알아보고자한다. 대상및방법 퇴행성척추질환으로케이지를이용한후방추체간유합술을시행받은환자중 1년이상경과관찰한 81명을대상으로하였다. 평균나이는 61±10.95 세 (38-83 세 ) 였으며, 남자 32명, 여자 49명이었다. 평균추시기간은 24개월이었다. 대상환자선정은 1) 요추전만의회복이중요한하부요추인제 3요추부터 1천추에유합술이시행된환자. 2) 전만각이 4도인금속케이지를사용한환자. 3) 정확한비교를위하여동일한집도의가수술한환자. 4) 수술후감염, 불유합, 케이지의침강, 기기파손등의합병 Fig. 1. Measurement method of disc height. The midpoint between the 2 posterior corners and the midpoints between the 2 anterior corners were computed. A bisectrix of the sagittal plane angle between the vertebra s midplane was computed and the perpendicular distances to the upper vertebra s lower anterior corner and the lower vertebra s upper anterior corner determined. Disc height = Distance to (upper vertebra s lower anterior corner + lower vertebra s upper anterior corner) mean of cranial and caudal depth of the upper vertebra body 52

4 Journal of Korean Society of Spine Surgery Restoration of Lumbar Lordosis with Cage Table 2. Change of segmental lordosis Preop Postop Final Preop-PO Preop-final PO-final Segmental lordosis L (0.70) -0.7 (0.58) -1.1 (0.16) Segmental lordosis L (0.001) -0.9 (0.045) -2.2 (0.001) Segmental lordosis L5S (0.99) -0.7 (0.55) -0.7 (0.38) 증이발생한환자는대상에서제외하였다. 수술방법은신경압박이심한쪽편측으로접근하여추간판절제술을시행한다음, 케이지는좌, 우측관계없이분절당 1개를삽입하였다. 추간판을철저하게제거하고케이지를삽입하기전에먼저추간판부위에국소골을충분히채워넣어케이지외부에서도골유합이이루어질수있도록하였다. 물론케이지내부에도국소골을최대한많이넣었다. 남은국소골은케이지를삽입한반대측에후외방유합술을시행하였다. 수술전, 수술 6주, 마지막추시시에요천추정면및측면방사선사진을이용하여요추전만각, 케이지가삽입된요추분절각, 추간판높이, 시상축정렬을분석하였다. 요추전만각은제1 요추상단과제1천추상단까지 Cobb 방법으로측정하였다. 요 추분절각은유합분절의상위추체의상단과하위추체의하단을이은선이만나서이루는각으로측정하였다. 추간판높이는 distortion-compensated roentgen analysis 8) 방법 (Fig. 1) 으로측정하였다. 통계적분석은 T-test, chi-square test 및 ANOVA test 를사용하였고, p 값이 0.05 이하시통계학적유의성이있는것으로평가하였다. 결과 제 3요추에서 1천추까지유합술을시행한 81명을포함하였고 62명에서 1 분절유합을, 19명에서 2분절유합을시행하였다. 유합분절은 4-5 요추가 46명, 5요추-1 천추가 12명, 3-4 요추가 4 명, 요추가 9 명, 4-5요추 -1천추가 10 명이었다. 1. 요추전만각 (Table 1) 전체요추전만각은수술전 34.2 o 에서수술후 34.6 o 로증가하였지만통계학적으로유의하지않았다 (p=0.714). 최종추시시요추전만각은 32.2 o 로수술전과수술직후에비해통계학적으로유의하게감소하였다 (p=0.008, 0.001). 즉요추유합술에케이지를사용하였지만최종추시시요추전만각은수술전에비해오히려감소된결과를보였다 (Fig. 2). 60세를기준으로환자군을나누어분석한결과 60세이상환자군에서요추전만각의변화는수술전-수술후-최종추시시각각 36.0 o o o 로측정되어, 60세이하 32.2 o o o 와비교하여차이가없었으며통계적으로유의하지않았다 (p=0.22, 0.37, 0.18). Fig 2. Loss of lumbar lordosis after posterior lumbar interbody fusion for the patient with spinal stenosis. (A) On preoperative x-ray lumbar lordosis was 32.7 and segmental lordosis at L45 was 7.4. (B) At the final follow-up, lumbar lordosis was 25.3 and segmental lordosis was 4.3 with significant loss of lordosis. 2. 케이지삽입분절의분절각 (Table 2) 케이지가삽입된분절은 3요추부터 1천추까지로, 3-4요추, 4-5요추, 5요추-1천추에서각각요추분절각을측정하였다. 3-4요추분절에삽입된케이지는 13예였고, 4-5요추분절에

5 Kyu-Jung Cho et al Volume 20 Number 2 June 2013 Table 3. Change of disc height Preop Postop Final Preop-PO Preop-final PO-final L (0.54) 0 (0.92) (0.23) L (0.00) 0.03 (0.09) 0.06 (0.09) L5S (0.23) 0.03 (0.41) (0.17) 예, 5요추-1 천추에 22예였다. 요추분절각은 3-4요추에서수술전에 5.0 o 가수술후 5.4 o 로호전되었다가최종추시시에 4.3 o 로교정소실되어오히려수술전보다감소하였다. 4-5요추는수술전에 7.1 o, 수술후 8.4 o, 최종추시시에 6.2 o 로최종추시시수술전보다감소하였다. 5요추-1천추는수술전에 9.8 o, 수술후 9.8 o, 최종추시시에 9.1 o 로나타나최종수시시수술전에비해감소하였다. 즉 3-4, 4-5요추, 5요추-1 천추의모든분절에서최종추시시수술전및직후에비해교정소실이발생하였고특히 4-5요추에서는수술전에비해최종추시시통계학적으로유의하게많은교정소실이있었다 (p= 0.045). 3. 추간판높이 (Table 3) 추간판의높이는환자별로나타날수있는절대적인추간판높이차이를보정하기위해서추간판높이와추체의비율로측정을하였다. 수술전, 수술후, 최종추시시각각 3-4 요추가 , 4-5요추가 , 5요추-1천추가 로나타나수술전에비해최종추시시추간판높이는유지및회복양상을보였다. 하지만수술직후에비해서는교정소실로인해최종추시시에모든분절에서추간판높이가감소되었다. 특히 4-5 요추에서통계학적으로유의하게교정이소실되었다 (p=0.0001). 4. 제 7 경추수선제 7경추수선은수술전 15.5mm 에서최종추시시 26.3 mm 로증가하는추세를보였지만통계학적으로유의하지않았다 (p=0.71). 고찰 요추부질환의치료에서추체간유합술은퇴행성변화의일차적인병소인추간판을직접절제함으로써통증의원인을근본 적으로제거한다. 그리고신경관감압의목적뿐만아니라, 추체높이를회복시키고전방지지를재건해서체중부하를지지하는장점등으로최근많이사용되는수술방법이다. 9-11) 골유합측면에서도단순히후외방유합술보다는압박력이작용하는전방부위에골이식을하기때문에우수한결과를보이고있다. 그리고후외방유합술에비해이식골의양이적게필요하기때문에자가장골이식골을채취할필요가없어서장골이식골공여부위의통증및감염등의합병증이발생하지않는다는장점도있다. 12) 추체간유합술의방법으로는전방요추추체간유합술 (ALIF), 신경공경유요추추체간유합술 (TLIF), 후방요추추체간유합술 (PLIF) 등이있다. Hsieh 13) 등은전방요추추체간유합술및신경공경우요추추체간유합술에서신경공높이, 유합분절각도, 요추전만각의변화를비교하였는데전방요추추체간유합술이신경공경유추체간유합술보다요추전만각의회복이효과적이라발표하였다. 하지만전방요추추체간유합술은신경공경우유합술이나후방유합술과달리전방도달을추가적으로시행해야하는번거로움이있다. 저자들은자가장골을이식한후외방유합술과국소골만을이용한후방요추체간유합술을비교한연구에서이식골공여부인장골부위통증이술후 3개월째는 91.7% 에서나타났고그중 20.8% 에서는 6개월이상지속되었다. 14) 그래서이식골을따로채취하지않고수술도중에얻어지는국소골만으로유합을얻을수있는방법으로국소골과단일케이지를이용한후방요추체간유합술을수년간시행하고있다. 유합률과임상결과는자가장골을이식한후외방유합술과비교하여차이가없었으며그결과를이미보고한바있다. 12,14) 후방요추체간유합술은추가적으로전방지주의보강으로추체간높이의회복과요추전만각의복원을기대할수있다. 하지만저자들이초창기에사용한전만각 4도의케이지를삽입한환자에서는요추전만각의회복이수술전에비해만족스럽지않은결과를보였다. 이에저자들은케이지를사용한요추후방추체간유합술이요추전만각을 54

6 Journal of Korean Society of Spine Surgery Restoration of Lumbar Lordosis with Cage 얼마나회복시키는가를분석하였다. 요추전만각을회복시키기위해서는일차적으로강봉을원하는요추전만각에맞추어서구부려야한다. 하지만골다공증이있는노인환자에서는수술직후에는얻어진요추전만각이유지되더라도보행을시작하면서체중이부하되면교정소실로인해요추전만각이감소할수밖에없다. 따라서강봉을구부려서얻어진요추전만각을유지하려면교정소실이일어나는추간판부위에서전방지주보강이요구된다. 전방지주를보강하는케이지의전만각도에따라교정소실이정도도차이가날것으로판단한다. 케이지의전만각도가크다면그분절의전만각이유지되고, 결국은전체요추전만각에도영향을미친다고볼수있다. 추체간유합에케이지를사용한경우와케이지없이골이식만시행한경우를비교한연구가다수발표되었다. 일반적으로는케이지를사용한환자에서추간판높이의회복이나전만각복원이우수하다는결과가많다. Liebensteiner 8) 등은추간판높이회복이케이지군에서더많이되었고추시기간동안회복된높이의소실도적었다고보고하였다. 요추전만각또한케이지군에서최종추시시에복원된높이가잘유지되는경향을보였다. Kim 9) 등은다른결과를발표하였는데 no-cage 군과 cage 군에서추간판높이는최종추시에수술전과비교하여 no-cage 군에서 12%, cage 군에서 27% 의증가를보여추간판높이의회복은 cage 군에서 no-cage 군보다우수하였다. 하지만요추분절전만각은오히려 no-cage 군에서 4.0 증가된반면 cage 군에서 3.8 의감소를보여 cage 군에서요추전만각의유의한소실이발생하였다. 이와같이보고에따라추체간유합술후추간판높이와요추전만각의교정이서로다른결과를보이는이유는사용한케이지의종류가다르기때문이라고생각한다. 케이지의높이, 형태, 각도에따라서추간판높이의회복뿐만아니라요추전만각의복원이달라질수있다. 케이지의높이는추간판높이를직접적으로결정하고, 케이지의모양과각도는분절전만각과전체요추전만각에영향을미친다. 최근연구에서 15,16) 케이지의종류에따라서달라지는결과가발표되었는데 Groth 16) 는후방요추추체간유합술에서 vertical 케이지와 threaded cylindrical 케이지를비교분석하여, 추간판높이는 vertical 케이지군에서감소한반면 threaded cylindrical 케이지군에서증가하였고, 요추전만각은반대로 vertical 케이지군에서증가하였고 threaded cylindrical 케이지군에서감소하였다. 특히요추전만각을회복하기위해서척추경나사못을조립할때나사못머리사이를좁히면서압박력을가하는데, 뼈가약한고령의환자에게과도한압박력을가하면초기에는요추전만각 이충분히얻어졌다하더라도추후체중이부하되면오히려압박력이가해져서벌어진전방추간판부위에서교정소실이더일어나게된다. 본연구에서요추전만각은최종추시시교정소실이발생하여수술전수치보다오히려감소하였지만, 추간판높이는교정소실에도불구하고수술전에비해유지내지는증가하였다. 이결과로미루어보아수술직후복원된전만각의교정소실이전방및후방추간판부위모두에서일어나지만전방추간판부위에서더많이발생되었다고할수있다. 요추체간유합술에서충분한추간판간격을확보하지못하면전방추간판간격이감소하게되어결과적으로전만각의교정소실이발생한다. 그러므로교정소실을줄이기위해서는추간판간격을회복시켜야하고, 이를위해서는적절한높이와전만각이큰케이지를추간판에삽입하여케이지와추체간의간격을없애는것이필요하다. 다시말하면전만각의교정소실을줄이기위해서는적당한높이의케이지로추간판높이를확보하고전만각각도가큰케이지를삽입하여케이지와전방추체간의간격을없애야한다. 하지만현재시중에서사용가능한후방추체간유합술용케이지는전만각이 0도, 4도, 8도밖에없어 4-5요추, 5요추-1 천추의정상분절전만각인 15도전후에비해부족한실정이다. 전방추체간유합술용케이지는전만각이 12 도, 15도인케이지까지다양한반면후방추체간유합술용케이지는다양하지않다. 따라서후방추체간유합술용케이지를 12 도, 15도전만각도케이지제작이요구되고있다. 각분절의분절각은 3-4 요추, 4-5요추에서수술전보다수술직후유합분절각도가증가하였으나최종추시시수술직후보다감소하였으며이는전만각과같은이유로체중이부하되면서교정소실이일어났을것이며 4-5요추및 5-1요추의분절각이요추전만각의 71% 정도차지함을고려할때특히이분절들에대해적절한높이와각도의케이지를삽입하여분절각을회복시켜야전체요추전만각의회복도기대할수있을것으로생각된다. 본연구에서 60세를기준으로환자군을나누어분석한결과 60세이상및이하의환자군에서요추전만각의변화는차이가없었다. 이는수술전후의요추전만각의변화가나이등의환자의개인변수보다케이지등의수술적변수가전만각의회복에더중요하다고할수있다. 본연구와같은방사선학적측정을사용하는연구에서는측정의정확성과신뢰성을위해측정오차에대한표기의중요성이강조된다. 본연구에서관측자내측정오차를표기하지못한것은본연구의제한점으로지적이될수있다. 그러나본연구를포함한다른연구결과도마찬가지로재측정으로인한평균 55

7 Kyu-Jung Cho et al Volume 20 Number 2 June 2013 치변화와이로인한지표간의상관관계는큰의미가없을것으로사료되며본연구에서는 1인의관측자및 1인의수술의로이루어진연구로측정오차를최소화할수있었다고사료된다. 결론 퇴행성요추질환에시행한전만각 4도의케이지를이용한후방추체간유합술결과요추전만각의회복은만족스럽지않았다. 수술직후에얻어진전만각은최종추시시소실되어수술전수치보다오히려줄어드는경향을보였다. 케이지를삽입한분절의분절각도전체요추전만각과유사한결과를보여수술직후에는호전되었다가최종추시시수술전보다오히려감소하였다. 이런결과는교정소실이추간판부위에서발생하였기때문으로생각된다. 따라서추시과정에서발생하는교정소실을줄일수있는방법을찾아보아야한다. 반면에추간판높이는최종추시시수술전보다호전내지유지되는결과를얻을수있었다. REFERENCES 1. Cloward RB. The treatment of ruptured lumbar intervertebral discs by vertebral body fusion. I. Indications, operative technique, aftercare. J Neurosurg. 1953;10: Collis JS. Total disc replacement. A modified posterior interbody fusion. Report of 750 cases. Clin Orthop Relat Res. 1985;(193): Henley EN Jr, David SM. Lumbar arthrodesis for the treatment of back pain. J bone Joint Surg Am. 1999;81: Ma GW. Posterior lumbar interbody fusion with specialized instruments. Clin Orthop Relat Res. 1985;(193): Arai Y, Takahashi M, Kurosawa H, Shitoto K. Comparative study of iliac bone graft and carbon cage with local bone graft in posterior lumbar interbody fusion. J Orthop Surg(Hong Kong). 2002;10: Bernhardt M, Bridwell KH. Segmental analysis of the sagittal plane alignment of the normal thoracic and lumbar spines and thoracolumbar junction. Spine (Phila Pa 1976). 1989;14: Lee CS, Oh WH, Chung SS, Lee SG, Lee JY. Analysis of the sagittal alignment of normal spines. J Korean Orthop Assoc. 1999;34: Liebensteiner MC, Jesacher G, Thaler M, Gstoettner M, Liebensteiner MV, Bach CM. Restoration and preservation of disc height and segmental lordosis with circumferential lumbar fusion: a retrospective analysis of cage versus bone graft. J Spinal Disord Tech. 2011;24: Kim JH, Kim SS, Kim JH, Kim BJ. Comparison of monosegment instrumented posterior lumbar interbody fusion with and without a metal cage in degenerative spine. J Korean Orthop Assoc. 2008;43: Song KJ, Lim YJ, Choi BW, Seo KB. Clinical efficacy of a stand-alone, threaded-titanium fusion cage for single-level degenerative lumbar spinal disorders. J Korean Orthop Assoc. 2008;43: Takahashi H, Suguro T, Yokoyama Y, Lida Y, Terashima F, Wada A. Effect of cage geometry on sagittal alignment after posterior lumbar interbody fusion for degenerative disc disease. J Orthop Surg(Hong Kong). 2010;18: Yoon YH, Cho KJ, Park SR, Moon KH, Lee TJ, Park HB. Posterior lumbar interbody fusion and unilateral posterolateral fusion with local bone and single cage- comparision to posterolateral lumbar fusion with autologous iliac bone. J Korean Orthop Assoc. 2009;44: Hsieh PC, Koski TR, O Shaughnessy BA, et al. Anterior lumbar interbody fusion in comparison with transforaminal lumbar interbody fusion: implications for the restoration of foraminal height,local disc angle, lumbar lordosis, and sagittal balance. J Neurosurg Spine. 2007;7: Cho KJ, Choi DH, Jung SR, Park SR: Local bone versus autogenous iliac bone graft for posterolateral fusion in the same patient. J Korean Soc Spine Surg. 2002;9: Kroppenstedt S, Gulde M, Schonmayr R. Radiological comparison of instrumented posterior lumbar interbody fusion with one or two closed-box plasmapore coated titanium cages. Spine (Phila Pa 1976). 2008;33: Groth A, Kuklo T, Klemme W, Polly D, Schroeder T. Comparison of sagittal contour and posterior disc height following interbody fusion; threaded cylindrical cages versus structural allograft versus vertical cages. J Spinal Disord. 2005;18:

8 Journal of Korean Society of Spine Surgery Restoration of Lumbar Lordosis with Cage 요추퇴행성질환에서 4 도케이지를사용한후방요추체간유합술은요추전만각을얼마나회복시키는가? 조규정 김영태 박승림 홍승현인하대학교의과대학정형외과학교실 연구계획 : 후향적, 방사선적평가 목적 : 퇴행성척추질환에서케이지를이용한후방요추체간유합술로요추전만각과추간판높이가얼마나회복되는가를알아보고자한다. 선행문헌의요약 : 케이지를이용한후방요추체간유합술후요추전만각의회복은환자의예후에있어중요하나, 케이지와요추전만각의관계에대한 연구는부족한실정이다. 대상및방법 : 퇴행성추간판질환으로케이지와척추경나사못고정술을시행받은 81 명을분석하였다. 전체환자의평균나이는 61 세 (38-83 세 ) 였다. 전만각이 4 도인금속케이지를사용한환자만포함하였다. 불유합, 케이지의침강, 기기파손등의합병증이발생한환자는제외하였다. 방사선사진에 서요추전만각, 케이지가삽입된요추분절각, 추간판높이, 시상축정렬을분석하였다. 결과 : 유합한분절수는 62 명에서 1 분절유합, 19 명에서 2 분절유합을시행하였다. 3 분절이상의유합은대상에포함하지않았다. 유합범위는 3 요추 부터 1 천추사이였다. 요추전만각은수술전 34.2 에서수술후 34.6 로회복되었다가최종추시시 32.2 로나타나, 수술전에비해요추전만각이감소 하였다 (p=0.008). 케이지가삽입된요추분절각은 3-4 요추에서수술전 5.0 가최종추시시 4.3 로, 4-5 요추에서수술전 7.1 가최종추시시 6.2 로, 5 요추 -1 천추는수술전 9.8 가최종추시시 9.1 로확인되었다. 추간판높이는수술전, 수술후, 최종추시시각각 3-4 요추가 , 4-5 요추가 , 5 요추 -1 천추가 로나타나수술전에비해회복되는양상을보였다. 결론 : 전만각 4 도의금속케이지를이용한후방추체간유합술결과추간판높이는수술전과비교하여유지및회복되었으나, 요추전만각과케이지가 삽입된분절각은오히려수술전보다감소하였다. 색인단어 : 후방요추체간유합술, 케이지, 요추전만각, 분절각, 추간판높이 약칭제목 : 케이지를이용한요추전만각의회복 57

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