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The related outcome and complication rate in primary lumbar microscopic disc surgery depending on the surgeon's
Matthias Wiese1, Jürgen Krämer, Kai Bernsmann
1University Clinic, Department of Orthopaedic Surgery, St. Josef Hospital, Gudrunstrasse 56, 44791 Bochum, Germany. Matthias.Wiese@ruhr-uni-bochum.de
Background Context:
Studies concerning intraoperative complications and their influence on the clinical outcome of microscopic disc surgery are quite rare. Complication rates vary between 1.5% and 15.8%. A correlation between the surgeon's experience and the complication rate may be expected.
Purpose:
To determine the influence of the surgeon's experience on the intraoperative complication rate in lumbar microscopic disc surgery.
Study Design:
Three studies are included: 1) retrospective analysis of intraoperative complications in microscopic disc surgery (N=1,872); 2) prospective follow-up study of microscopic disc surgery (N=583); 3) prospective evaluation of complication rates in microscopic disc surgery (N=90).
Patient Sample:
Patient data sets from 1,872 lumbar microscopic disc surgeries performed between January 7, 1981, and June 31, 2000, were examined in a retrospective study. A total of 463 patients, operated on between 1991 and 1996, were followed up by a questionnaire. Finally, a prospective controlled trial (N=90) was performed.
Outcome Measures:
Such complications as incidental durotomy, wrong level exposure, or bleeding were analyzed based on the patient data sets by a blinded external evaluator. The rates of lower back pain and ischiatic pain were measured on a visual analogue scale at follow-up in Study 2 and Study 3. To measure the outcome of surgery in daily life activities and functional capacity, the Tegner activity level was calculated. In addition, a questionnaire with the Hannover score was used. The patient's social and economic status was also recorded.
Methods:
A total of 1,872 lumbar microscopic disc surgeries, performed between January 7, 1981 and June 31, 2000, were examined in a retrospective study. Intra- and perioperative complications were evaluated and related to the surgeons' level of experience. Patients in the first group (XL) were operated on by the most experienced surgeon (more than 500 microscopic discectomies before the beginning of the study). The L-group surgeons performed between 50 and 100 microscopic disc surgeries before the study. This group included a total number of seven surgeons during the 1981-2000 time frame. None of this group reached the experience level of 500 surgeries during the course of the study. A total of 463 patients, operated on between 1991 and 1996, were followed up. Finally, a prospective controlled trial (N=90) was performed. Injuries of the dura, nerve root, ventral structures and wrong level exposure, which had been detected and corrected during surgery, were analyzed. In the second and third study, the outcome was correlated to surgery and complications during surgery.
Results:
The rate of intraoperative complications showed a statistically significant difference between the groups. The comparison of both groups (n=1,872) with regard to the rate of intraoperative complications showed a statistically significant difference between 2.2% in the XL group and 10.7% in the L group (p< or =.001). Regarding work-related and socioeconomic factors, no significant difference in the outcome was seen.
Conclusions:
Microscopic disc surgery requires a course of instruction and a considerable number of surgeries under supervision by experienced surgeons. To shorten the learning curve, a number of standardized surgery steps to clearly identify anatomical landmarks are helpful. During training, these landmarks can be checked by an experienced surgeon to minimize the rate of intraoperative complications. Initial postoperative ischiatic pain was correlated to an incidental durotomy with p<.001. For long-term results after disc surgery, however, socioeconomic and work-related factors are of greater importance in spinal disc surgery than the incidence of intraoperative complications.
Insights
Surgeon experience significantly impacts intraoperative complication rates in microscopic lumbar disc surgery. Less experienced surgeons had higher complication rates, emphasizing the need for supervised training and standardized surgical steps.
Area of Science:
- Neurosurgery
- Spinal Surgery
- Surgical Outcomes
Background:
- Intraoperative complications in microscopic disc surgery are understudied, with reported rates ranging from 1.5% to 15.8%.
- A potential correlation between surgeon experience and complication rates is hypothesized.
- Understanding this relationship is crucial for improving patient safety and surgical outcomes.
Purpose of the Study:
- To investigate the influence of surgeon experience on intraoperative complication rates during lumbar microscopic disc surgery.
- To quantify the difference in complication rates between highly experienced and less experienced surgeons.
Main Methods:
- A combined retrospective and prospective study design analyzing data from 1,872 lumbar microscopic disc surgeries.
- Complications such as durotomy, wrong level exposure, and bleeding were assessed by a blinded evaluator.
- Surgeons were categorized based on experience: XL group ( >500 surgeries) and L group (50-100 surgeries).
Main Results:
- A statistically significant difference in intraoperative complication rates was observed between surgeon groups (2.2% in XL group vs. 10.7% in L group, p<0.001).
- No significant differences were found in work-related or socioeconomic factors influencing the outcome.
- Initial postoperative ischiatic pain was correlated with incidental durotomy (p<0.001).
Conclusions:
- Microscopic disc surgery necessitates structured training and extensive supervised practice.
- Standardized surgical steps and landmark identification aid in reducing the learning curve and intraoperative complications.
- While intraoperative complications are important, socioeconomic and work-related factors play a greater role in long-term outcomes of spinal disc surgery.
