JUPITER 4.0 - Risk Factors for Failure of Isolated Medial Patellofemoral Ligament Reconstruction

Hospital for Special Surgery (HSS)

Status

Enrolling

Conditions

Patellar Dislocation, Recurrent

Patellofemoral Dislocation

Patellar Dislocation

Patellofemoral Disorder

Patellar Instability

Patellofemoral Joint Dislocation

Treatments

Procedure: Medial Patellofemoral Ligament (MPFL) Reconstruction

Study type

Observational

Funder types

Other

Identifiers

NCT06883396

2022-0649

Details and patient eligibility

About

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.

Full description

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.

Enrollment

850 estimated patients

Sex

All

Ages

10 to 35 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

10-35 years old
Recurrent patellar instability with at least one episode defined as either (1) a dislocated patella requiring reduction in the emergency department or (2) a convincing history for dislocation, associated with full giving way, and the following physical findings: (a) hemarthrosis or effusion, (b) tenderness along the medial retinaculum, and (c) apprehension when laterally directed force was applied to the patella or (3) MRI-documented dislocation with associated bone bruises

Exclusion criteria

Previous ipsilateral knee surgery
Obligatory/fixed/habitual patella dislocation or subluxation
Unloadable inferior or lateral chondral damage on the patella that would require a tibial tubercle transfer for unloading purposes
Pathologic tibiofemoral instability