Clinical Scorecard: Preoperative 7-T 3D Meniscal T2* Mapping Is Associated With Postrepair Extrusion in Medial Meniscus Posterior Root Tears

At a Glance

Key Highlights

• The study evaluated whether pre-repair 7-T 3D T2* measurements were associated with medial meniscal extrusion after MMPRT repair.
• The study also compared T2* measurements before and after repair with measurements in age- and sex-matched healthy controls.
• Prior histology-validated studies cited in the article associate higher T2* values with disorganized or degenerated meniscal collagen fibers.
• Patients underwent two-tunnel transtibial root repair, with or without a centralization suture.
• The supplied article text describes the study aims and methods but does not provide its results.

Guideline-Based Recommendations

Diagnosis

• Study enrollment required MRI- and arthroscopy-confirmed complete radial (type II) MMPRT.
• During arthroscopy, the surgeon assessed meniscal surface integrity and tear extent; surfaces were scored from 0 (smooth) to 3 (severe fibrillation).

Management

• All enrolled patients underwent two-tunnel transtibial root repair, with or without a centralization suture.
• The introduction states that nonoperative MMPRT management is associated with more rapid osteoarthritis development and elevated risk of total knee arthroplasty; this is background, not a guideline recommendation.

Monitoring & Follow-up

• Patients received MRI before and after repair; healthy controls received one MRI using the same protocol.
• KOOS surveys documented knee pain before repair and at follow-up 6–12 months after repair.

Risks

• The introduction describes MMPRT as causing loss of hoop stress, outward meniscal extrusion, and increased tibiofemoral contact pressures.
• The introduction reports an association between greater post-repair extrusion and more radiographic osteoarthritis progression.

Patient & Prescribing Data

Prospectively enrolled adults aged 18 years or older with complete radial (type II) MMPRT, pre-repair MRI, and follow-up MRI after repair; controls had no history of knee pathology or surgery.

Patients underwent two-tunnel transtibial root repair, with or without a centralization suture. The supplied text does not report treatment outcomes or medication prescribing data.

Clinical Best Practices

• The study protocol used MRI and arthroscopy to confirm MMPRT and assess tear extent.
• The study used 7-T 3D multi-echo gradient-recalled echo imaging for quantitative T2* mapping.
• The MRI protocol positioned the main magnetic field approximately perpendicular to the meniscal superior–inferior surfaces to minimize the magic angle effect.
• The article describes T2* as associated with collagen fiber organization; the supplied text does not establish a clinical threshold for decision-making.

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