Training, assessment and the learning curve
Most early injuries happen in a surgeon’s first thirty cases. Most late ones happen to surgeons who think the curve is behind them.
Reviewed against its sources on 22 October 2026.
- The learning curve is real (90 percent of early injuries in the first 30 cases) but rates never fell to open-era levels.
- Train in steps: simulation, supervised cases on the Zwisch ladder, video review of your own Critical View.
- Open cholecystectomy is now a conversion in a hostile field; keep the skill deliberately.
01The learning curve
- The early laparoscopic injuries clustered in a surgeon’s first 30 cases. That is the learning curve, and it is real.
- It is not the whole story. Injury rates stayed above the open era long after the curve, and experienced surgeons still injure ducts through misidentification, not clumsiness. See bile duct injury.
- Each new platform brings a new curve. The 2026 robotic data are read the same way.
Sources
Moore and Bennett, Am J Surg 1995: surgeon experience was the only factor linked to injury in a multivariate model. Observational A single-institution series of 2,427 cases found the rate fell only from 0.58 to 0.50 percent between its first and second halves, and argued that the hazard is inherent to the approach, not just to inexperience (Am Surg 1995). The robotic learning-curve interpretation is from the robotic page.
02Numbers and certification
| System | What is required |
|---|---|
| UK (ISCP general surgery curriculum, index procedures) | Indicative 40 cholecystectomies by the end of Phase 2 at PBA level 3; 50 by the end of Phase 3 (emergency general surgery, may include elective cases) at level 4, laparoscopic and/or open; three level-4 PBAs from different assessors |
| USA (American Board of Surgery) | The Fundamentals of Laparoscopic Surgery (FLS) exam has been required before the qualifying exam since the 2009 to 2010 year; ACS and SAGES recommend FLS certification for every surgeon who operates laparoscopically (2012) |
| Every system | Numbers are a floor. They say you have been in the room, not that you can clear a fibrotic triangle or decide to stop. Expert opinion |
Sources
ISCP, General surgery index procedures and indicative numbers (Appendix 4); the 2025 specialty-specific guidance for the portfolio pathway lists 50 to 110 cholecystectomies depending on the skill set. ACS and SAGES joint statement on FLS, 2012. Curriculum and society statements Check the current curriculum before quoting a number in an interview: these change.
03Supervised autonomy
The Zwisch scale, used in the SIMPL app, rates every case this way. In a 14-programme US study of 10,130 operations, only a third of ratings in the last six months of residency were “supervision only” for the five core operations, cholecystectomy among them. Observational
- Brief before the case: who does which step, and the stop rules.
- Let the trainee own the CVS. Ask them to name the structures and say “two structures, clip” before you agree. Expert opinion
- Take over for a reason you can say out loud, then give the operation back if you can.
- Debrief in one sentence each: what went well, what to change.
- Do not start a step you cannot finish. Say “I am not sure what this is” early; it is the safest sentence in surgery.
- Do not count cases. Count cases where you obtained and documented the CVS yourself.
- Do not let a smooth case become the only kind you can do. Ask for the Parkland 3s with a trainer who will stay.
Sources
Zwisch model: DaRosa et al., J Surg Educ 2013. Readiness for independent practice: George et al., Ann Surg 2017: 444 attending surgeons rated 536 residents after 10,130 procedures. Observational
04Simulation
- The landmark trial randomised 16 residents; the virtual-reality group dissected the gallbladder faster and with fewer errors in the operating theatre (Seymour 2002). Randomised trial
- Virtual reality was at least as good as a box trainer in the one trial that compared them. A box trainer is cheap and does most of the job. Expert opinion
- Simulation builds instrument handling and the sequence of steps. It does not teach judgement in a fibrotic triangle. That still needs supervised cases.
Sources
Nagendran et al., Cochrane 2013: time mean difference −11.76 minutes (95% CI −15.23 to −8.30); performance better with VR (SMD 1.65, fixed effect) but not significant under a random-effects model. Systematic review Seymour et al., Ann Surg 2002: randomised, double-blinded; the exact figures are in the paper and are not quoted here.
05Video, scoring and artificial intelligence
- Record your Critical View. Use doublet photographs or video for review and feedback where available, alongside the operation note. See the CVS page for documentation practice and its evidence.
- Computers can now rate the three CVS criteria from a still image with about 70 percent accuracy. That is good enough for audit and feedback, not for the decision to clip. Contested
Use a structured score when you review a trainee’s video: was the triangle cleared, was the lower third of the gallbladder off the plate, were two and only two structures seen, from both sides. Score the video, not the memory of the case. Expert opinion
Sources
Mascagni et al., Ann Surg 2022: segmentation and classification networks, five-fold cross-validation, mean average precision 71.9 percent. SAGES CVS Challenge consortium, arXiv 2025: the first AI competition run by a surgical society; best entries improved assessment, calibration and robustness over the prior state of the art. Pre-print and single-centre data
06Open cholecystectomy as a skill
- Open cholecystectomy today is almost always a conversion in a difficult, inflamed field: the hardest version of the operation, done by the surgeons with the least practice at it.
- Confidence tracks exposure. Trainees who had done or assisted at more than 20 open cholecystectomies were far more confident to do one, to convert to one, and to do one alone as a consultant.
- Conversion is a bail-out, not a defeat. It is the safest option only if you can do what comes next. See bail-out strategies.
- Scrub for every open biliary case you can find: conversions, open duct explorations, hepatobiliary lists.
- Know the open steps cold: a right subcostal incision, pack and retract, fundus-first dissection, the same CVS, and an open subtotal when the triangle will not clear. Expert opinion
- Use cadaver and simulation courses for exposure that the lists no longer give.
- Convert early, when the field is still clean, not late when it is bloody. Expert opinion
- That opening will show you the duct. The anatomy is no clearer through a wound than through a scope; the hand just gives you more options.
- That conversion ends the risk. Injuries happen after conversion too. The same rules apply.
Sources
Sinha et al., Surg Endosc 2013: Hospital Episode Statistics, 83.3 percent laparoscopic, conversion 5.0 percent, major duct injury needing repair 0.4 percent. Campbell et al., Int J Surg 2018: survey through the Royal Australasian College of Surgeons; 87.8 versus 57.3 percent confident for elective open cholecystectomy, 87.8 versus 58.7 for conversion, 73.2 versus 45.3 for independent practice. Bingmer et al., SAGES 2017 abstract: ACGME case logs; the five procedures were anti-reflux, appendicectomy, colectomy, splenectomy and inguinal hernia, so the figure is a proxy for open exposure, not for open cholecystectomy itself. Observational and survey data
07What examiners ask
- What is the learning curve for laparoscopic cholecystectomy, and why did injury rates not return to open levels after it?
- How should a trainee be supervised through their first fifty cholecystectomies?
- What does the evidence say about simulation, and what can it not teach?
- Trainees now rarely see an open cholecystectomy. Is that a problem, and what would you do about it?
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