Evidence map›Paper›PMID 42812844›Full record

ArticleJournal of experimental orthopaedics2026

Comparable clinical outcomes and redislocation rates after isolated medial patellofemoral ligament reconstruction in patients with and without borderline anatomical risk factors for patellar instability.

Alessio Maione, Simone Romano, Pierrenzo Pozzi, Matteo D Parmigiani, Alessandra Menon, Paolo Ferrua, Filippo Calanna, Riccardo Compagnoni, Eva Usellini, Andrea Mambretti and 2 more

Abstract read
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Article in Journal of experimental orthopaedics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

What it found

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2 · The registry

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3 · Its place in the literature

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4 · The record

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5 · Who and what money

Authors and funding

12 authors.

Alessio MaioneASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini-CTO, 1° Clinica Ortopedica Milan Italy.ORCID https://orcid.org/0000-0002-4464-2254
Simone RomanoResidency Program in Orthopedics and Traumatology University of Milan Milan Italy.ORCID https://orcid.org/0009-0000-0770-1115
Pierrenzo PozziResidency Program in Orthopedics and Traumatology University of Milan Milan Italy.
Matteo D ParmigianiASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini-CTO, 1° Clinica Ortopedica Milan Italy.ORCID https://orcid.org/0009-0002-1206-0572
Alessandra MenonASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini-CTO, 1° Clinica Ortopedica Milan Italy.
Paolo FerruaDepartment of Biomedical Sciences for Health, Laboratory of Applied Biomechanics University of Milan Milan Italy.
Filippo CalannaASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini-CTO, 1° Clinica Ortopedica Milan Italy.
Riccardo CompagnoniASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini-CTO, 1° Clinica Ortopedica Milan Italy.
Eva UselliniASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini-CTO, Traumatologia Sportiva Milan Italy.
Andrea MambrettiASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini-CTO, Traumatologia Sportiva Milan Italy.
Massimo BerrutoASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini-CTO, Traumatologia Sportiva Milan Italy.
Pietro S RandelliASST Centro Specialistico Ortopedico Traumatologico Gaetano Pini-CTO, 1° Clinica Ortopedica Milan Italy.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Purpose: The purpose of this study was to compare mid- to long-term clinical outcomes and redislocation rates after isolated medial patellofemoral ligament (MPFL) reconstruction in patients with and without borderline anatomical risk factors. It was hypothesized that isolated MPFL reconstruction would provide comparable outcomes regardless of borderline anatomical abnormalities. Methods: A retrospective comparative study was performed on 51 patients (55 knees) treated with isolated MPFL reconstruction for recurrent patellar instability between 2013 and 2023. Patients were divided into a standard group (Caton-Deschamps Index [CDI] < 1.2, tibial tubercle-trochlear groove [TT-TG] < 20 mm, absent or Type A trochlear dysplasia) and a borderline group (CDI 1.2-1.4, TT-TG 20-24 mm and/or Dejour Type B-D trochlear dysplasia without explosive J-sign or large trochlear spur). Clinical outcomes were assessed using Knee injury and Osteoarthritis Outcome Score (KOOS), Kujala, Tegner and Visual Analogue Scale (VAS) scores at a mean follow-up of 7.9 ± 3.9 years. Redislocations and complications were recorded. Results: Twenty-five knees were included in the standard group and 30 in the borderline group. Both groups showed significant improvement in all clinical scores from baseline to final follow-up ( Conclusions: Isolated MPFL reconstruction provides reliable and durable mid- to long-term outcomes in carefully selected patients with borderline anatomical risk factors, with clinical results and redislocation rates comparable to those observed in standard patients. These findings support a patient-specific surgical approach, suggesting that additional bony procedures should be reserved for clearly pathological anatomical abnormalities rather than routinely performed in borderline cases. Level of Evidence: Level III.

Indexed as

knee surgeryMPFL reconstructionpatella altapatellar instabilitytrochlear dysplasia

Identifiers

PMID42812844
PMCPMC13623013

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