The goal of this observational study is to learn about the outcomes of medial patellofemoral ligament (MPFL) reconstruction for the treatment of recurrent patellar instability. The main questions it aims to answer are: * What are the risk factors for recurrent patellar instability after MPFL reconstruction? * What functional outcomes do patients report after MPFL reconstruction? Participants undergoing MPFL reconstruction will answer survey questions about their knee and activity level 1 year and 2 years after surgery.
The JUPITER group consists of high-volume patellofemoral surgeons across the United States, and was organized to facilitate the collection of clinical and radiographic outcomes following surgical and non-surgical treatment of patellar instability. With this study (JUPITER 4.0), the group aims to prospectively enroll a new cohort of consecutive patients with recurrent patellar instability that would undergo isolated MPFL reconstruction regardless of radiographic measurements or anatomic risk factors to address two specific aims - 1) what patient, injury, and surgical factors lead to recurrent instability following isolated MPFL reconstruction and 2) the creation of an instability severity index score, with the long-term objective of identifying preoperatively, patients with a high risk of failure of an isolated MPFL reconstruction who may be better served with concomitant bony procedure.
Study Type
OBSERVATIONAL
Enrollment
850
For the purposes of this study, isolated MPFL reconstruction is defined as MPFL reconstruction with a tendon graft, with or without additional soft tissue procedure(s) including lateral retinacular lengthening or release, patellofemoral chondroplasty and/or cartilage restoration. No patient in the study will receive a bony realignment procedure to treat patellar instability.
Stanford University
Redwood City, California, United States
RECRUITINGUniversity of Florida
Gainesville, Florida, United States
RECRUITINGMidwest Orthopaedics at Rush
Chicago, Illinois, United States
RECRUITINGUniversity of Iowa
Iowa City, Iowa, United States
RECRUITINGMassachusetts General Hospital
Boston, Massachusetts, United States
RECRUITINGBoston Children's Hospital
Boston, Massachusetts, United States
RECRUITINGMayo Clinic
Rochester, Minnesota, United States
NOT_YET_RECRUITINGMount Sinai
New York, New York, United States
NOT_YET_RECRUITINGNYU Langone Health
New York, New York, United States
RECRUITINGHospital for Special Surgery
New York, New York, United States
RECRUITING...and 6 more locations
Recurrent patellar instability
Patient-reported patellar dislocation or subluxation
Time frame: Within 24 months post-operatively
Patient-Reported Outcome Measures (PROMs): Kujala score
The Kujala score, also known as the Anterior Knee Pain Scale (AKPS), is a 13-item questionnaire that helps assess subjective reactions to activities and symptoms related to patellofemoral pain. It is a 0-to-100 point scale, with higher scores indicating better outcomes and less pain and disability.
Time frame: 12 months post-operatively and 24 months post-operatively
Patient-Reported Outcome Measures (PROMs): Pedi-IKDC
The Pedi-IDKC is a modified version of the International Knee Documentation Committee (IDKC) Subjective Knee Form for use in young patients. It is a 15-item knee-specific questionnaire that measures symptoms, function, and sports activity. Scores range from 0-100, with higher scores indicating better outcomes.
Time frame: 12 months post-operatively and 24 months post-operatively
Patient-Reported Outcome Measures (PROMs): HSS Pedi-FABS
The Hospital for Special Surgery Pediatric Functional Activity Brief Scale (HSS Pedi-FABS) is a validated 8-item questionnaire scored from 0-30, with higher scores indicating higher levels of activity.
Time frame: 12 months post-operatively and 24 months post-operatively
Patient-Reported Outcome Measures (PROMs): KOOS-12
The Knee injury and Osteoarthritis Outcome Score-12 (KOOS-12) is a 12-item measure evaluating the difficulties people experience due to problems with their knee. Each question is scored from 0 to 4 points, with 0 representing no knee problems and 4 representing extreme knee problems. Overall, scores range from 0 to 100, where, in contrast to the individual questions, 0 is the worst possible and 100 is the best possible score.
Time frame: Time Frame: 12 months post-operatively and 24 months post-operatively
Patient-Reported Outcome Measures (PROMs): BPII 2.0
The BPII 2.0 (Banff Patellofemoral Instability Instrument) is a patient-reported outcome measure assessing quality of life in individuals with patellofemoral instability. The score ranges from 0 to 100, with higher scores indicating greater quality of life.
Time frame: 12 months post-operatively and 24 months post-operatively
Patient-Reported Outcome Measures (PROMs): PROMIS-29
PROMIS (Patient-Reported Outcomes Measurement Information System) is a questionnaire that evaluates health-related quality of life across seven key domains: physical function, pain interference, fatigue, sleep disturbance, physical and mental health, and social health. It is scored a T-score metric. High scores mean more of the concept being measured. 10 points on the T-score metric is one standard deviation (SD).
Time frame: 12 months post-operatively and 24 months post-operatively
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