An observational study in Patellar Dislocation, sponsored by Vestre Viken Hospital Trust. Enrolling by invitation at 1 site in Norway. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2025-05-14.
Sponsored by Vestre Viken Hospital Trust · Observational
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.
41 studies on the registry are indexed under Patellar Dislocation; 9 are open to participants now.
This study's planned enrollment of 20 is below the median of 100 across 15 observational studies indexed under Patellar Dislocation.
Browse Patellar Dislocation studies →Vestre Viken Hospital Trust is the lead sponsor of 52 studies on the registry; 23 are open to participants now.
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This retrospective cohort study evaluates the long-term outcomes of arthroscopic trochleoplasty performed to stabilize the patella in patients with chronic recurrent dislocations. The procedure involves deepening the trochlea femoris to enhance patellar tracking and prevent lateral dislocation. In some cases, medial patellofemoral ligament (MPFL) reconstruction was also performed. Data will be collected through patient medical records and structured telephone interviews, focusing on re-operation rates, postoperative complications, pain levels, functional outcomes, and quality of life. The study seeks to provide insights into the effectiveness and safety of this surgical technique, aiming to optimize treatment protocols for patellar instability.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Re-operation Rate
Proportion of patients requiring additional surgical interventions after the index surgery at our institution.
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.
Recurrent Instability Rate
Incidence of recurrent patellar dislocations post-surgery.
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.
Postoperative Complications
Frequency and type of complications following trochleoplasty.
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.
Functional Outcome
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.
Time frame: At the time of the interview, which will be performed from 1 year up to 7 years postoperatively.
EQ-5D-5L (HRQoL) scores
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.
Time frame: At the time of the follow-up interview, which will be performed from 1 year up to 7 years postoperatively.
Pain Assessment
Numeric pain rating scale (NRS), ranging from the least pain, 0, to the worst pain imaginable, 10, during daily activities.
Time frame: At the time of the follow-up interview, which will be performed from 1 year up to 7 years postoperatively.
Patient Satisfaction
Satisfaction score on a scale, ranging from 1 (very dissatisfied) to 5 (very satisfied).
Time frame: At the time of the follow-up interview, which will be performed from 1 year up to 7 years postoperatively.
Plan to share: No
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Vestre Viken Hospital Trust