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NCT Number: NCT06906419

Arthroscopic Trochleaplasty in Chronic Relapsing Patellar Dislocations: A Follow-up Study

This study aims to evaluate the long-term clinical outcomes of arthroscopic trochleoplasty in patients treated for chronic recurrent patellar dislocations. The primary objective is to assess the effectiveness of the procedure in reducing the need for re-operations and preventing recurrent instability. Secondary objectives include evaluating postoperative complications, patellofemoral pain, functional outcomes using the Kujala Anterior Knee Pain Scale (AKPS), and quality of life measured by EQ-5D-5L. This retrospective cohort study will analyze data from patient records and structured telephone interviews conducted at least one year post-surgery.

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Key information

Conditions

Patellar Dislocation Joint Diseases Joint Dislocations Knee Injuries Leg Injuries Musculoskeletal Diseases Wounds and Injuries

Age range

18 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

Vestre Viken HF

Drammen, 3004, Norway

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Patients aged 18 years and older.
  • Underwent arthroscopic trochleoplasty for chronic recurrent patellar dislocations.
  • Surgery performed between 2015 and 2023.
  • Availability of follow-up data and consent for participation.

Exclusion criteria

  • Concurrent knee surgeries unrelated to trochleoplasty.
  • Previous surgeries on the same knee.
  • Other significant orthopedic conditions affecting the knee.
  • Lack of follow-up data or consent.

Treatment and study plan

Primary outcomes

  1. Re-operation Rate

    Time frame: The investigators seek to register any re-operations from the time between the index surgery and the interview, ranging from 1 year up to 7 years postoperatively.

    Proportion of patients requiring additional surgical interventions after the index surgery at our institution.

Secondary outcomes

  1. Recurrent Instability Rate

    Time frame: The investigators seek to register any incidences of recurrent instability from the time between the index surgery and the interview, ranging from 1 year up to 7 years postoperatively.

    Incidence of recurrent patellar dislocations post-surgery.

  2. Postoperative Complications

    Time frame: The investigators seek to register any complications related to the index surgery from the time between the index surgery and the interview, ranging from 1 year up to 7 years postoperatively.

    Frequency and type of complications following trochleoplasty.

  3. Functional Outcome

    Time frame: At the time of the interview, which will be performed from 1 year up to 7 years postoperatively.

    Kujala Anterior Knee Pain Scale (AKPS) scores assessing pain and knee function. The Kujala Score or Anterior Knee Pain Scale (AKPS) is a 13-item self-report questionnaire that assesses subjective reactions to particular activities and symptoms that are known to correlate with anterior knee pain syndrome. The AKPS is graded on a scale of 0 to 100, with 100 being the highest possible score. Lower scores reflect greater pain and disability.

  4. EQ-5D-5L (HRQoL) scores

    Time frame: At the time of the follow-up interview, which will be performed from 1 year up to 7 years postoperatively.

    EQ-5D-5L (HRQoL) scores evaluating general health and well-being. The descriptive system comprises five dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each dimension has 5 levels: no problems, slight problems, moderate problems, severe problems and extreme problems. The patient is asked to indicate his/her health state by ticking the box next to the most appropriate statement in each of the five dimensions. This decision results in a 1-digit number that expresses the level selected for that dimension. The digits for the five dimensions can be combined into a 5-digit number that describes the patient's health state.

  5. Pain Assessment

    Time frame: At the time of the follow-up interview, which will be performed from 1 year up to 7 years postoperatively.

    Numeric pain rating scale (NRS), ranging from the least pain, 0, to the worst pain imaginable, 10, during daily activities.

  6. Patient Satisfaction

    Time frame: At the time of the follow-up interview, which will be performed from 1 year up to 7 years postoperatively.

    Satisfaction score on a scale, ranging from 1 (very dissatisfied) to 5 (very satisfied).

Sponsors and collaborators

Lead sponsor

Vestre Viken Hospital Trust

Other

Registry information

Official study title

Evaluering av Kliniske Resultater Hos Pasienter Operert for Kronisk Residiverende Patellaluksasjoner Ved Hjelp av Artroskopisk Stabilisering Med Trokleaplastikk. En Kvalitetskontroll-studie

Important dates

Study start
2025
Primary completion
2025
Study completion
2025
First posted
Apr 2, 2025
Registry last updated
May 14, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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