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Related Experiment Video

Updated: May 17, 2026

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Learning curve of basic hip arthroscopy technique: CUSUM analysis.

Young-Kyun Lee1, Yong-Chan Ha, Deuk-Soo Hwang

  • 1Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, 166 Gumi-ro, Bundang-gu, Seongnam, 463-707, South Korea.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|October 18, 2012
PubMed
Summary

Hip arthroscopy proficiency requires approximately 20 cases, as shown by Cumulative Sum (CUSUM) analysis. This method helps surgeons monitor outcomes and improve hip arthroscopy techniques.

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Area of Science:

  • Orthopedic Surgery
  • Surgical Education
  • Medical Device Technology

Background:

  • Hip arthroscopy learning curves are traditionally measured by arbitrary metrics like operative time or complication rates.
  • These metrics do not always correlate with actual clinical outcomes.
  • Cumulative Sum (CUSUM) analysis offers a data-driven approach to monitor surgeon performance and clinical outcomes.

Purpose of the Study:

  • To determine the learning curve for basic hip arthroscopy technique.
  • To evaluate the efficacy of Cumulative Sum (CUSUM) analysis in monitoring surgeon performance.
  • To establish a benchmark for proficiency in hip arthroscopy based on clinical outcomes.

Main Methods:

  • Retrospective analysis of 40 consecutive hip arthroscopy cases.

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Last Updated: May 17, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

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  • Treatment failure defined as Modified Harris Hip Score < 80 at 6 months postoperatively.
  • Patients stratified into early (1-20) and late (21-40) groups; CUSUM analysis applied to track failure rates.

    • Main Results:

    • Overall treatment failure rate was 20% (8/40 patients).
    • While not statistically significant, the late group (cases 21-40) showed a lower failure rate (10%) compared to the early group (30%).
    • CUSUM analysis indicated a rapid decrease in failure rates after approximately 21 cases, reaching an acceptable level after 30 cases.

    Conclusions:

    • Surgeon experience is a critical factor influencing hip arthroscopy outcomes.
    • CUSUM analysis demonstrates a learning period of roughly 20 cases is needed for satisfactory clinical outcomes.
    • The established learning curve can guide surgeons in self-monitoring and continuous quality improvement for hip arthroscopy.