Learning Curve Research Articles

Learning curve of colorectal endoscopic submucosal dissection of an endoscopist experienced hands-on training in Japan.

Colorectal endoscopic submucosal dissection is a technically demanding procedure with a steep learning curve. In Japan, the National Cancer Center Hospital allows overseas doctors to participate in hands-on training. We aimed to assess the colorectal endoscopic submucosal dissection performance and learning curve of an endoscopist who participated in hands-on training. In this retrospective analysis using a prospectively collected database, 100 consecutive superficial colorectal tumors from 100 patients treated with endoscopic submucosal dissection by a colorectal surgeon between January 2020 and May 2024 were included. The cases were grouped into three learning periods: phase I (the initial 30 cases under local expert supervision before training in Japan), phase II (the middle 30 cases), and phase III (the last 40 cases). The primary outcome was resection speed. The median resection speed was 5, 11.7, and 13.2cm2/h in phases I, II, and III, respectively. In matched data, the resection speeds in phases II and III were higher than that in phase I (P=0.02 and P<0.001, respectively). En bloc and R0 resection rates were 99% and 95%, respectively. The en bloc resection, R0 resection, and complication rates were not different between phases. Cumulative sum analysis of the resection speed revealed that proficiency was achieved after 36 cases. An endoscopist who underwent a tutored approach and hands-on training in Japan achieved the proficiency benchmarks for colorectal endoscopic submucosal dissection after 36 cases. However, the endoscopist's extensive experience before training may contribute to excellent outcomes.

The Role of Robotics in Enhancing Precision and Outcomes in Orthopedic Surgery

The advent of robotics has significantly transformed orthopedic surgery, addressing challenges inherent in traditional manual techniques, such as variability in outcomes and precision limitations. Robotics enables millimeter-level accuracy, minimizes human error, and allows for personalized, minimally invasive procedures. Historical milestones, from the pioneering ROBODOC system in 1992 to advanced platforms like MAKO and ROSA, illustrate the progressive adoption of robotic systems, particularly in joint replacement and spine surgeries. Comparative studies demonstrate enhanced precision and reduced recovery times for robotic-assisted surgeries compared to conventional methods, with quantifiable improvements in alignment accuracy and postoperative outcomes. Key applications include joint arthroplasties, spinal surgeries, and complex trauma cases, where robotic assistance ensures accurate implant positioning, improved functional outcomes, and higher patient satisfaction rates. However, barriers such as cost, access disparities, and the learning curve persist. Emerging technologies, including artificial intelligence, augmented reality, and haptic feedback, are anticipated to further enhance robotic precision and broaden accessibility. As robotic systems become integral to orthopedic practice, ongoing advancements promise to elevate surgical standards, offering reliable, patient-specific solutions that improve both procedural consistency and quality of life.

No difference in surgical time and total theatre time between robotically assisted and computer assisted total knee arthroplasty

IntroductionA number of studies have demonstrated a significant reduction of surgical time for robotically assisted surgery (RAS) total knee arthroplasty (TKA) after the learning curve between 6 and 43 cases. It is unknown if the logistics of RAS produce a longer total theatre time since published literature only reflects the surgical time. It is also unknown how RAS surgical and total theatre times compare with computer assisted surgery (CAS) TKA.MethodsThis is a prospective study of 524 consecutive patients undergoing a CAS or a RAS TKA using the same cementless implant. We recorded age, sex, body mass index (BMI), incision time of the first case, total surgical time, total theatre time, length of stay and 90-day complication and readmission rate.ResultsDuring the study period, 205 CAS and 199 RAS TKA were performed. There was no difference at baseline in age (p = 0.546), sex (p = 0.920) or BMI (p = 0.791). Surgical time for CAS was 78.3 (± 22.2) min and for RAS was 80.1 (± 25.7) min, p = 0.451. Total theatre time for CAS was 117.4 (± 27.8) min and 119.3 (± 30.7) min for RAS, p = 0.515. There was no difference in length of stay (p = 0.674), 90-day complication (p = 0.530) or readmission rate (p = 0.930). There was a difference in skin-incision average time for the first case (p = 0.022).ConclusionsAlthough theatre set-up for the first case is 5 min longer, RAS-TKA does not prolong the surgical time or total theatre time when compared with CAS-TKA. There was no reduction in case volume since the introduction of robotics.Level of evidenceIII.

The learning curve and outcomes of 1038 endoscopic endonasal transsphenoidal pituitary tumor surgeries – A single surgical team experience

The learning curve and outcomes of 1038 endoscopic endonasal transsphenoidal pituitary tumor surgeries – A single surgical team experience

Arthroscopic Bone Block and Arthroscopic Latarjet for Anterior Shoulder Dislocation—Technical Note with Tricks and Tips for Conversion and Successful Surgery

Background: The treatment of patients affected by recurrent anterior shoulder instability has received more attention in the last ten years, focusing on the management of bone loss, which is crucial in predicting postoperative recurrence risk. Recently, various bone grafting techniques and different fixation methods have been developed to preserve native anatomy and reduce complications. Nowadays, glenoid bone reconstruction is usually carried out via the Latarjet procedure or free bone block technique. While the Latarjet procedure has traditionally been considered the best option, the bone block has been demonstrated to be a successful procedure. Even though the indication to perform a free bone block or a Latarjet procedure may be given preoperatively, in cases where the choice between the two procedures is unclear, the decision can be made intraoperatively, given the possibility to switch from one to another. This technical note aims to outline our techniques for the arthroscopic Latarjet procedure and the arthroscopic free bone block, as well as discuss the indications, benefits and downsides of each procedure. Technical tips and tricks are provided. Methods: A step-by-step thorough description of bone block and Latarjet procedures is provided, as well as a comparison of advantages and disadvantages of each technique and tips to avoid complications. Respective indications are discussed. Results: Both the procedures have benefits and downsides. The arthroscopic Latarjet procedure is the most effective in addressing anterior shoulder instability, but is more elaborate, has a shallow learning curve and can have a high complication rate. The bone block technique is an anatomic procedure with a shorter learning curve but has fewer indications. Conclusion: The Latarjet is currently considered the gold standard for glenoid bone grafting. The bone block technique can allegedly be seen as being “in the middle” of the soft tissue repair and Latarjet procedures. Many factors should be considered when choosing the right surgical technique, and treatment plans must be customized for each patient. More studies with long-term follow-up are needed to evaluate the efficacy of arthroscopic bone grafting procedures in various subtypes of patients based on bipolar bone loss assessment and individual risk factors.

Sámi trust in hydropower governance: A survey study

The collaborative water governance literature, especially that concerned with trust, has paid scant attention to Indigenous Peoples. In this paper, we present the results from a survey targeting the Sámi population in Sweden, exploring trust in key state and industry actors in the governance of hydropower. The results demonstrate a widespread signal of low trust, which is correlated with a confluence of factors: a strong concern with negative impacts from hydropower on Sámi culture, experiences of limited opportunities to influence decisions, and a perceived low competence as well as limiting attitude from governance actors. Regarding the role of demographic variables, we report on some notable deviations from previous research about institutional trust. We discuss how collaborative governance initiatives often-times are launched to strengthen trust, but that design and implementation failures can, counter-productively, serve to erode trust among Indigenous constituencies. If Sámi trust is to be strengthened, then it will require state authorities and hydropower companies to genuinely engage with Sámi rights claims and ensure influence in decision-making. Our findings also have direct policy relevance, pointing to the need for a steep learning curve if the pending review of hydropower licenses, launched by the Swedish government, is to play a meaningful role in addressing past and ongoing impacts of hydropower on the Sámi People.

Penile inversion vulvo-vaginoplasty with scrotal graft for trans women: surgical technique and results of initial experience.

A significant proportion of trans women is demanding for a genital gender-affirming surgery, with vulvo-vaginoplasty being the most frequently requested procedure. The gold standard for primary vaginoplasty in trans women is the penile skin inversion technique with scrotal skin graft, which allows for increased depth of the vaginal cavity. The assessment of vulvo-vaginoplasty outcomes utilizing penile skin inversion and scrotal skin graft in individuals assigned male at birth in the surgeon's learning curve involves evaluating aesthetics, functionality, and sexual aspects. A total of 76 individuals assigned male at birth were included in 2 French university hospitals from 2020 to 2022. They underwent vulvo-vaginoplasty following 8 key steps: scrotal skin excision; bilateral orchiectomy; dissection between the rectum, bladder, and prostate; penile dissection; clitoroplasty; urethroplasty; penile skin inversion with scrotal skin graft; labioplasty. The average follow-up period was 12.4months, with participants averaging 35.7years of age. Each patient was invited to complete a questionnaire during follow-up. The study's outcomes encompassed the assessment of both early and late surgical complications, postoperative sexuality, aesthetic results, and voiding satisfaction. Of the total patients, 15.8% experienced major early postoperative complications, while 3% encountered major late postoperative complications. No complication was classified 4 or 5 in Clavien-Dindo scale. Most early complications were related to issues in vulvar healing, which did not compromise long-term aesthetic results. Patients-reported satisfaction was 82% after the procedure. Vulvo-vaginoplasty utilizing penile skin inversion and scrotal skin graft for individuals assigned male at birth is a reproductive surgery procedure that can be successfully performed by experienced urologist. It achieves high patient-reported satisfaction even during the learning curve. The surgical procedures were consistent, and the sizable cohort of patients accurately reflects the learning curve of both surgeons. However, extrapolating long-term complications is challenging due to the relatively brief follow-up period. Additionally, there is a lack of self-reported sexual function data, and the scales used to assess patient-reported quality of life and urinary satisfaction are not specifically validated for transgender patients. Vulvo-vaginoplasty utilizing penile skin inversion and scrotal skin graft for individuals assigned male at birth is a complex surgical procedure. It appears to be achievable by experienced urologists during their learning curve, resulting in similar functional and surgical outcomes, along with high patient satisfaction.

An Educational Wildlife Game-based Learning Application for Young Learners Using Augmented Reality

These digital days, the learning curve in the educational sector is changing progressively because of technological advancements and societal demands. Technology integration, particularly, provides the ability to engage in diverse learning platforms, which then expose the learners to an immersive learning experience. This study introduced augmented reality (AR) game-based learning mobile application to young learners in exploring wildlife conservation. However, the challenge in mixing fun gameplay and essential wildlife education to foster young learner's interest in wildlife conservation can be tough. In capturing the attention of young learners, the project aims to create a captivating wildlife game application that combines education with entertainment. This project employs a prototyping method, allowing for iterative development and testing of the AR game application to ensure its effectiveness in delivering educational content. The application incorporates interactive elements such as 3D models of wildlife with vocal features and quizzes elements. Findings reveal that the application facilitated the refinement of game mechanics and educational content based on user feedback, leading to an engaging and educational final product. The results emphasize the success of the approach is not only capturing young learner's interest but also increasing their knowledge and awareness of wildlife conservation. In the future, the incorporation of other elements such as leaderboard, badges and rewards have the potential to stimulate young learners’ motivation to actively participate in the learning program.

Laparoscopic versus open lumbar sympathectomy in critical limb threatening ischemia patients in Egypt

PurposeThe treatment of critical limb-threatening ischemia (CLTI) is revascularization. Lumbar sympathectomy (LS) could be attempted when this is not amenable. Using laparoscopic techniques to perform LS adds the advantages of minimally invasive surgery.MethodsTwenty-four patients, presenting with non-reconstructable CLTI and rest pain, were randomly divided into group I (14 patients) who underwent retroperitoneoscopic lumbar sympathectomy (RPLS) and group II (10 patients) who had conventional open lumber sympathectomy (COLS).ResultsRPLS patients had shorter hospital stays, fewer intraoperative complications, and less postoperative pain. However, the mean operative time was significantly longer (86.4 ± 9.1 min, p-value: 0.02) in the RPLS group but decreased with each subsequent case after that. The differences in post-operative capillary refill time, ABI, TBI, and TcPO2 were not statistically significant between both groups (p-values: 0.97, 0.13, 0.32, 0.10, respectively). However, the difference in the quality-of-life score was statistically significant; the mean (± SD) SF-36 score increased from 48 ± 6.8 to 81 ± 4.4 (p-value < 0.001) in RPLS group compared to 52 ± 8.8 to 59 ± 1.2 (p-value: 0.52) in COLS group.ConclusionRPLS is feasible, safe, and has the advantages of minimally invasive surgery: minimal blood loss, less intraoperative complications, shorter hospital stay, and less postoperative pain. However, the operative time in RPLS cases is longer than in the COLS; training on the procedure is recommended to improve the learning curve.

Unilateral biportal endoscopic spine surgery: a meta-analysis unveiling the learning curve and clinical benefits

Unilateral biportal endoscopic spine surgery: a meta-analysis unveiling the learning curve and clinical benefits

Experiences of physiotherapists working with adults living with Long COVID in Canada: a qualitative study

ObjectivesTo explore experiences of physiotherapists working with adults living with Long COVID in Canada.DesignCross-sectional descriptive qualitative study involving online semi-structured interviews.ParticipantsWe recruited physiotherapists in Canada who self-identified as having clinically...

Dorsal Preservation Rhinoplasty-the Perspective of "Preservers" Versus "Structural" Surgeons.

The objective of this study was to describe the surgeons who have incorporated dorsal preservation (DP) into their practice and their techniques. An anonymous form reviewed by the Evidence-Based Rhinoplasty Research Group board was shared on its Telegram group. The study population was divided into three groups based on their answers: "Preservers," "Mainly Structural," and "Structural exclusively." This study included the answers of 145 worldwide surgeons. DP was more common among plastic surgeons than otolaryngologists/facial plastic surgeons; DP techniques were mostly preferred by surgeons with 10-20 years of experience, while structural techniques were mostly preferred by surgeons with > 20 years of experience; 50.8% of the surgeons who prefer DP techniques use it in more than 90% of primaries; surface techniques (ST) have been more used, mainly by surgeons who prefer structural techniques (p < 0.001). ST were considered more stable (p < 0.001), more predictable (p < 0.001), and shorter learning curve (p < 0.001). Many surgeons using DP still perform structural rhinoplasty. The most cited concern was hump persistence/recurrence. DP rhinoplasty is gaining acceptance, and ST are favored for their perceived short learning curve, stability, and predictability. However, concerns about hump recurrence cause some to continue using structural methods alongside DP.

Precision and effort in robot-assisted placement of pedicle screws compared to standard surgical navigation.

Aim was to compare image-guided navigation with a robot-assisted solution for performing MISS regarding precision, required time and subjective aspects. 90 pedicles were instrumented on two torsos, half with navigation, half robot-assisted. Precision analysis between both solutions didn't show a significant difference. Time measurement showed a significantly longer duration per wire for the robot-arm on the first torso and a not significant longer duration on the second torso, where a significant reduction in the mean duration was shown. There was no significant difference in the subjective impressions comparing navigation and robot except the possibility to change the procedure. Precision of both methods is suitable for clinical use. A time advantage using the robot-arm couldn't be demonstrated in the present study. A significant learning curve was shown, so a reduction in the longer duration on the robot can be expected. Further studies in clinical use are necessary.

Electroencephalography-Based Brain-Computer Interfaces in Rehabilitation: A Bibliometric Analysis (2013–2023)

EEG-based Brain-Computer Interfaces (BCIs) have gained significant attention in rehabilitation due to their non-invasive, accessible ability to capture brain activity and restore neurological functions in patients with conditions such as stroke and spinal cord injuries. This study offers a comprehensive bibliometric analysis of global EEG-based BCI research in rehabilitation from 2013 to 2023. It focuses on primary research and review articles addressing technological innovations, effectiveness, and system advancements in clinical rehabilitation. Data were sourced from databases like Web of Science, and bibliometric tools (bibliometrix R) were used to analyze publication trends, geographic distribution, keyword co-occurrences, and collaboration networks. The results reveal a rapid increase in EEG-BCI research, peaking in 2022, with a primary focus on motor and sensory rehabilitation. EEG remains the most commonly used method, with significant contributions from Asia, Europe, and North America. Additionally, there is growing interest in applying BCIs to mental health, as well as integrating artificial intelligence (AI), particularly machine learning, to enhance system accuracy and adaptability. However, challenges remain, such as system inefficiencies and slow learning curves. These could be addressed by incorporating multi-modal approaches and advanced neuroimaging technologies. Further research is needed to validate the applicability of EEG-BCI advancements in both cognitive and motor rehabilitation, especially considering the high global prevalence of cerebrovascular diseases. To advance the field, expanding global participation, particularly in underrepresented regions like Latin America, is essential. Improving system efficiency through multi-modal approaches and AI integration is also critical. Ethical considerations, including data privacy, transparency, and equitable access to BCI technologies, must be prioritized to ensure the inclusive development and use of these technologies across diverse socioeconomic groups.

Transjugular Random Renal Biopsy: A Review.

Random renal biopsy is considered the gold standard for the diagnosis of systemic renal disorders. Percutaneous biopsy remains a safe option for most patients; however, the percutaneous approach may be considered too risky in approximately 5-10% of patients. In these high-risk patients, transjugular renal biopsy (TJRB) may represent an underutilized alternative. TJRB is a technically difficult procedure with a learning curve of approximately 10 cases. When performed properly, TJRB is a safe alternative to percutaneous biopsy in patients with renal failure or who are at high risk of bleeding. This article aims to provide a comprehensive review of the indications, techniques, precautions, and complications of TJRB, a possibly underutilized technique. (Rev Invest Clin. 2024;76(5):207-12).

Learning curve and complications of unilateral biportal endoscopy unilateral laminectomy bilateral decompression for lumbar spinal stenosis

Learning curve and complications of unilateral biportal endoscopy unilateral laminectomy bilateral decompression for lumbar spinal stenosis

A novel low-cost high-fidelity porcine model of liver metastases for simulation training in robotic parenchyma-preserving liver resection.

In the era of minimally invasive surgery (MIS), parenchyma-preserving liver resections are gaining prominence with the potential to offer improved perioperative outcomes without compromising oncological safety. The surgeon learning curve remains challenging, and simulation plays a key role in surgical training. Existing simulation models can be limited by suboptimal fidelity and high cost. We describe a novel, reproducible, high-fidelity, low-cost liver metastases model using porcine livers from adult Landrace pigs, with porcine perinephric fat used to simulate subcapsular metastases. This model was then utilised in a training session for surgical trainees performing robotic parenchyma-preserving surgery (PPS) under the guidance of expert robotic surgeons, with feedback being recorded. Trainees rated the model highly on its fidelity to human liver simulation (median score 9), tissue handling (median score 8), and overall usefulness (median score 9). Tissue handling was felt to simulate in vivo liver resection closely, while suggestions for improvement included adding simulated blood flow. This is a novel, low-cost, high-fidelity simulation model of liver metastases with high acceptability to surgical trainees, which could be readily adopted by other training centres.

A resident’s sharp learning curve: Post-needle stick injury arteriovenous fistula of the finger

Iatrogenic vascular injuries can be encountered during diagnostic or therapeutic interventions. Traumatic arteriovenous fistulas (AVFs) occur due to penetrating injury involving contiguous arteries and veins. We report a case of a 27-year-old postgraduate trainee who presented with swelling over her left middle finger for 5 months following a needle prick injury at the same site 1 year back, which was diagnosed with ultrasound and dynamic magnetic resonance imaging angiography. Endovascular embolization is avoided in AVFs of the hand due to the risk of distal ischemia, and surgical excision with reconstruction is the preferred treatment.

Learning curve for the combined trans-oral and chest approach to endoscopic selective neck dissection: a cumulative sum (CUSUM) analysis.

The combined trans-oral and chest approach is a novel technique for endoscopic selective neck dissection (SND), with satisfactory oncological safety and cosmetic results. However, this hybrid approach is difficult, and the learning curve remains unclear. In this study, we aimed to evaluate the short-term outcomes for this hybrid approach, and to define the associated learning curve. Clinical data and surgical outcomes of 58 PTC patients who underwent endoscopic SND via combined trans-oral and chest approach between September 2020 and April 2023 were retrospectively reviewed. The cumulative sum (CUSUM) sequential analysis technique is used to detect change, and has been applied for the evaluation of learning curves. The study population included 58 patients (40 females, 18 males), with mean age of 38.9 ± 12.7years and average body mass index of 22.6 ± 4.8kg/m2. In all cases, the same surgical team performed endoscopic SND via combined trans-oral and chest approach. The numbers of positive/retrieved lymph nodes were 4.3 ± 3.2/27.8 ± 8.4 in the lateral compartment and 4.0 ± 3.5/8.4 ± 5.1 in the central compartment. The learning curve was evaluated in terms of an initial phase (20 cases) and a mature phase (38 cases). Operative time was longer during the initial phase, compared to the mature phase (375.2 vs. 274.6min, p = 0.002). The frequency of operative complications was higher during the initial phase, compared to the mature phase (85% vs. 55.3%, p = 0.048). After the experience acquired using endoscopic SND via combined trans-oral and chest approach to treat PTC in 20 patients, the number of complications decreased significantly. Compared to data collected for the initial phase, data collected for the mature phase showed trends toward decreased operating time.

Effectiveness of a novel ex vivo training model for gastric endoscopic submucosal dissection training: a prospective observational study conducted at a single center in Japan.

The efficacy of endoscopic submucosal dissection (ESD) for early-stage gastric cancer is well established. However, its acquisition is challenging owing to its complexity. In Japan, G-Master is a novel ex vivo gastric ESD training model. The effectiveness of training using G-Master is unknown. This study evaluated the efficacy of gastric ESD training using the G-Master to evaluate trainees' learning curves and performance. Four trainees completed 30 ESD training sessions using the G-Master, and procedure time, resection area, resection completion, en-bloc resection requirement, and perforation occurrence were measured. Resection speed was the primary endpoint, and learning curves were evaluated using the Cumulative Sum (CUSUM) method. All trainees completed the resection and en-bloc resection of the lesion without any intraoperative perforations. The learning curves covered three phases: initial growth, plateau, and late growth. The transition from phase 1 to phase 2 required a median of 10 sessions. Each trainee completed 30 training sessions in approximately 4 months. Gastric ESD training using the G-Master is a simple, fast, and effective method for pre-ESD training in clinical practice. It is recommended that at least 10 training sessions be conducted.