레이블이 disc herniation인 게시물을 표시합니다. 모든 게시물 표시
레이블이 disc herniation인 게시물을 표시합니다. 모든 게시물 표시

2014년 10월 21일 화요일

내시경을 이용한 경피적 요추 절제술에서의 학습곡선 Learning curve for percutaneous endoscopic lumbar discectomy

Brief review

이 논문은 PELD에서의 learning curve에 대한 논문 입니다.
요새 계속 PELD learning curve에 대한 논문을 보고 있는데, 각 논문별로 언급된 항목에 조금씩 차이가 있네요. 여기서는 수술시간, 1년 후의 임상적 결과, 수술 성공률, 수술 실패율, 합병증 발생률, 재발률 등의 항목을 조사하였습니다. 
이 논문이 2008년에 출판되었는데, 최근에 출판된 PELD learning curve관련 논문들과 큰 차이는 없어보입니다.

Clinical success를 아래의 기준으로 판단했습니다.
1. 통증지수(VAS)의 향상률이 2점 이상
2. 장애지수(ODI)의 향상률이 25% 이상
3. 환자의 주관적인 회복률이 50% 이상
4. 주요한 합병증이 없음
그런데 주관적인 회복률을 어떻게 평가했는지 안나와있네요.. clinical outcome 평가 시 처럼 환자에게 전화하여 환자가 느끼는 회복률을 적용한 것 일까요

그리고 특이한점은 일반적으로 의학통계에 널리 사용되는 SPSS가 아니라 SAS라는 프로그램을 사용하여 분석을 했습니다.

아래의 링크 따라가셔서 전체 내용 확인하세요^^


*Title: Learning curve for percutaneous endoscopic lumbar discectomy
내시경을 이용한 경피적 요추 절제술에서의 학습곡선

*Authors: Lee DY, Lee SH


Background of data
Percutaneous endoscopic lumbar discectomy (PELD) is one of the surgical options for soft lumbar disk herniation, but the learning curve is perceived to be steep.


Methods















▶Subjects: 51 PELD cases performed for single-level intracanalicular lumbar disk herniation causing radiculopathy.
▶Divided into 3 groups: each 17 patients
▶Evaluating parameters: operating time, failure rate, complication rate, and 1-year reherniation rate.
▶1 year clinical success rate was assessed by telephone interviews






























Results
▶4 patients required subsequent open discectomy due to PELD failure.
▶2 minor complications.
▶1 year clinical success: achieved in 42 of the 47 patients
▶Reherniation developed in 5 patients
-A significant reduction in operating time was observed after 17 patients had been treated (p = 0.0004).
▶Failure rate, complication rate: no significant differences between the 3 groups
▶1year clinical success rate, reherniation rate: no significant differences



Conclusion

The PELD learning curve seems to be stable and acceptable with proper pre-PELD training.

2014년 1월 20일 월요일

Survivorship analysis of 150 consecutive patients with DIAM™ implantation for surgery of lumbar spinal stenosis and disc herniation

Brief review

*Title: Survivorship analysis of 150 consecutive patients with DIAM™ implantation for surgery of lumbar spinal stenosis and disc herniation
요추 협착증과 디스크 탈출증으로 DIAM 이식술을 시행한 150명의 환자에 대한 생존 분석

*Authors: Yoo-Joon Sur, Chae-Gwan Kong, Jong-Beom Park



Background of data
The Device for Intervertebral Assisted Motion (DIAM™) has been introduced for surgery of degenerative lumbar disc diseases.


Purpose
To determine the survivorship of DIAM™ implantation for degenerative lumbar disc diseases and risk factors for reoperation.


Methods
▶Subjects: 150 patients who underwent laminectomy or discectomy with DIAM™ implantation (84 males + 66 females)
▶Mean age: 46.5 years;
▶Mean follow-up period: 23 months (range 1–48 months)
▶Indications: 96 spinal stenosis and 54 disc herniations
▶Index level: 146 one-level (L4–5: 115/ L5–6: 31) and 4 two-level (L4–5 and L5–6)
▶Evaluating methods:
1. Kaplan–Meier analysis: To determine the cumulative reoperation rate and survival time
2. The log-rank test and Cox regression model: To evaluate the effect of age, gender, diagnosis, location, and level of DIAM™ implantation

-Reoperations of the DIAM™ implantation level or adjacent levels were defined as a failure and used as the end point for determining survivorship.


Results
▶Reoperation rate: 4.7% (total 7 patients- only implantation level)

▶The causes of reoperation:
1. recurrent spinal stenosis (n=3)
2. recurrent disc herniation (n=2)
3. post-laminectomy spondylolisthesis (n=1)
4. delayed deep wound infection (n=1)

▶The mean time interval (from 1st to 2nd surgery): 13.4 months (range 2–29 months)

▶Kaplan–Meier analysis: predicted an 8% cumulative reoperation rate 4 years post-operatively.
Survival time was predicted to be 45.6 ± 0.9 months.

▶In Log-rank test, the reoperation rate: L5–6 > L4–5 (p = 0.002)
two-level > one-level (p = 0.01)

-Gender, age, diagnosis did not significantly affect the reoperation rate of DIAM™ implantation.

-Based on a Cox regression model, L5–6 and two-level DIAM™ implantation were also significant variables associated with a higher reoperation rate.
(L5–6: hazard ratio (HR) 10.3, 95% CI, 1.7–63.0; p = 0.01 / HR, 10.4; 95% CI, 1.2–90.2; p = 0.04)

-Survival time was significantly lower in L5–6 (47 vs. 22 months, p = 0.002) and two-level DIAM™ implantation (46 vs. 18 months, p = 0.01) compared with L4–5 and one-level DIAM™ implantation.


Conclusions
-8% patients who have a DIAM™ implantation for primary lumbar spinal stenosis or disc herniation are expected to undergo reoperation at the same level within 4 years after surgery.


-DIAM™ implantation at L5–6 and two-level are significant risk factors for reoperation.