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Ha, Sung-Kon,Kim, Se-Hoon,Kim, Daniel H.,Park, Jung-Yul,Lim, Dong-Jun,Lee, Sang-Kook The Korean Neurosurgical Society 2009 Journal of Korean neurosurgical society Vol.45 No.3
Objective : The goal of this study was to evaluate the biomechanical features of human cadaveric spines implanted with the Activ L prosthesis. Methods : Five cadaveric human lumbosacral spines (L2-S2) were tested for different motion modes, i.e. extension and flexion, right and left lateral bending and rotation. Baseline measurements of the range of motion (ROM), disc pressure (DP), and facet strain (FS) were performed in six modes of motion by applying loads up to 8 Nm, with a loading rate of 0.3 Nm/second. A constant 400 N axial follower preload was applied throughout the loading. After the Activ L was implanted at the L4-L5 disc space, measurements were repeated in the same manner. Results : The Activ L arthroplasty showed statistically significant decrease of ROM during rotation, increase of ROM during flexion and lateral bending at the operative segment and increase of ROM at the inferior segment during flexion. The DP of the superior disc of the operative site was comparable to those of intact spine and the DP of the inferior disc decreased in all motion modes, but these were not statistically significant. For FS, statistically significant decrease was detected at the operative facet during flexion and at the inferior facet during rotation. Conclusion : In vitro physiologic preload setting, the Activ L arthroplasty showed less restoration of ROM at the operative and adjacent levels as compared with intact spine. However, results of this study revealed that there are several possible theoretical useful results to reduce the incidence of adjacent segment disease.
Ha, Sung-Kon,Lim, Dong-Jun,Kim, Sang-Dae,Kim, Se-Hoon The Korean Neurosurgical Society 2013 Journal of Korean neurosurgical society Vol.54 No.3
Rapidly developed de novo aneurysm is very rare. We present a rapidly developed and ruptured de novo anterior communicating aneurysm 8 days after the rupture of another aneurysm. This de novo aneurysm was not apparent in the initial 3-dimensional computed tomography and digital subtraction angiography. We reviewed the literature and discussed possible mechanisms for the development of this de novo aneurysm.
Ha, Sung-Kon,Lim, Dong-Jun,Seok, Bong-Gil,Kim, Se-Hoon,Park, Jung-Yul,Chung, Yong-Gu The Korean Neurosurgical Society 2009 Journal of Korean neurosurgical society Vol.46 No.1
Objective : This study was performed to elucidate the technical and patient-specific risk factors for postoperative ischemia in patients undergoing temporary arterial occlusion (TAO) during the surgical repair of their aneurysms. Methods : Eighty-nine consecutive patients in whom TAO was performed during surgical repair of an aneurysm were retrospectively analyzed. The demographics of the patients were analyzed with respect to age. Hunt and Hess grade on admission, Fisher grade of hemorrhage, aneurysm characteristics, timing of surgery, duration of temporary occlusion, and number of temporary occlusive episodes. Outcome was analyzed at the 3-month follow-up, along with the occurrence of symptomatic and radiological stroke. Results : In overall, twenty-seven patients (29.3%) had radiologic ischemia attributable to TAO and fifteen patients (16.3%) had symptomatic ischemia attributable to TAO. Older age and poor clinical grade were associated with poor clinical outcome. There was a significantly higher rate of symptomatic ischemia in patients who underwent early surgery (p=0.007). The incidence of ischemia was significantly higher in patients with TAO longer than 10 minutes (p=0.01). In addition, patients who underwent repeated TAO, which allowed reperfusion, had a lower incidence of ischemia than those who underwent single TAO lasting for more than 10 minutes (p=0.011). Conclusion : Duration of occlusion is the only variable that needs to be considered when assessing the risk of postoperative ischemic complication in patients who undergo temporary vascular occlusion. Attention must be paid to the patient's age, grade of hemorrhage, and the timing of surgery. In addition, patients undergoing dissection when brief periods of temporary occlusion are performed may benefit more from intermittent reperfusion than continuous clip application. With careful planning, the use of TAO is a safe technique when used for periods of less than 10 minutes.
Ha, U‐,Syn,Kim, Sung In,Kim, Su Jin,Cho, Hyuk‐,Jin,Hong, Sung‐,Hoo,Lee, Ji Youl,Kim, Joon Chul,Kim, Sae Woong,Hwang, Tae‐,Kon Blackwell Publishing Asia 2010 International journal of urology Vol.17 No.1
<P><B>Objective: </B> To compare the mid‐term oncological outcome of laparoscopic radical cystectomy (LRC) with those of open radical cystectomy (ORC).</P><P><B>Methods: </B> From June 2003 to February 2008, 36 LRCs were carried out at our institute for the treatment of bladder cancer. Clinical and oncological data were retrospectively analyzed. A match‐pair comparison with an historical series of 34 patients who were submitted to ORC between 1996 and 2003 was carried out.</P><P><B>Results: </B> Median follow‐up of the LRC group was 21 months (3–56 months). Pathological stage or grade was similar in the two groups. There was no significant difference between the LRC and ORC groups in terms of 3‐year overall (64.2% <I>vs</I> 72.6%, respectively; <I>P</I> = 0.682), cancer‐specific (73.0% <I>vs</I> 75.3%, respectively; <I>P</I> = 0.951), and recurrence‐free survival (70.5% <I>vs</I> 72.5%, respectively; <I>P</I> = 0.715) rates. In a subgroup analysis according to stage, there was also no significant difference in the 3‐year disease‐specific survival after LRC or ORC for organ‐confined (pT1 and pT2; 85.7% <I>vs</I> 83.9%, respectively; <I>P</I> = 0.256) or extravesical disease (pT3 and pT4; 73.3% <I>vs</I> 63.8%, respectively; <I>P</I> = 0.825).</P><P><B>Conclusion: </B> These findings suggest that LRC provides mid‐term oncological outcomes similar to those of ORC in the management of bladder cancer.</P>
Radiologic Assessment of Subsidence in Stand-Alone Cervical Polyetheretherketone (PEEK) Cage
Ha, Sung-Kon,Park, Jung-Yul,Kim, Se-Hoon,Lim, Dong-Jun,Kim, Sang-Dae,Lee, Sang-Kook The Korean Neurosurgical Society 2008 Journal of Korean neurosurgical society Vol.44 No.6
Objective : Aim of study was to find a proper method for assessing subsidence using a radiologic measurement following anterior cervical discectomy and fusion (ACDF) with stand-alone polyetheretherketone (PEEK), $Solis^{TM}$ cage. Methods : Forty-two patients who underwent ACDF with $Solis^{TM}$ cage were selected. With a minimum follow-up of 6 months, the retrospective investigation was conducted for 37 levels in 32 patients. Mean follow-up period was 18.9 months. Total intervertebral height (TIH) of two fused vertebral bodies was measured on digital radiographs with built-in software. Degree of subsidence (${\Delta}TIH$) was reflected by the difference between the immediate postoperative and follow-up TIH. Change of postoperative disc space height (CT-MR ${\Delta}TIH$) was reflected by the difference between TIH of the preoperative mid-sagittal 2D CT and that of the preoperative mid-sagittal T1-weighted MRI. Results : Compared to preoperative findings, postoperative disc height was increased in all cases and subsidence was observed only in 3 cases. For comparison of subsidence and non-subsidence group, TIH and CT-MR ${\Delta}TIH$ of each group were analyzed. There was no statistically significant difference in TIH and CT-MR ${\Delta}TIH$ between each group at 4 and 8 weeks, but a difference was observed at the last follow-up TIH (p=0.0497). Conclusion : ACDF with $Solis^{TM}$ cage was associated with relatively good radiologic long-term results. Fusion was achieved in 94.5% and subsidence occurred in 8.1% by the radiologic assessment. Statistical analysis reveals that the subsidence seen later than 8 weeks after surgery and the development of subsidence does not correlate statistically with the change of the postoperative disc space height.