Knee MRI Interpretation Report

Musculoskeletal Radiology — Right Knee, 1.5 T MRI

Report ID: MAA-MRI-9F2A56
Generated: May 22, 2026
Analysis: AI-Powered Image Interpretation

Patient Profile

Sex / Age:
Male, 34 years
Reported symptoms:
Right knee twisting injury 3 weeks ago during recreational soccer; medial joint-line pain, intermittent locking, swelling worse with activity
Examination:
Effusion, positive McMurray test (medial), full extension preserved
History:
Active recreational athlete, no prior knee surgery, no prior knee injuries
Study:
Non-contrast right knee MRI, 1.5 T, multi-planar T1, T2/PD, fat-sat T2, STIR

Summary Overview

Right knee MRI demonstrates a posterior horn medial meniscus tear (oblique pattern, extending to the inferior articular surface), a moderate joint effusion, and mild bone marrow edema in the adjacent medial tibial plateau. Cruciate and collateral ligaments are intact. Articular cartilage is grossly preserved.

+
Medial Meniscus Tear
Mod
Effusion
Intact
ACL/PCL/MCL/LCL

Detailed Imaging Findings

Medial MeniscusTear
Linear high-signal abnormality involving the posterior horn of the medial meniscus, with an oblique configuration extending from the under-surface (inferior articular surface) to the meniscal apex. No fragment displacement; no parameniscal cyst. Findings represent a Stoller grade 3 signal abnormality (true tear) [De Smet AA, AJR 1996]. Tear morphology is consistent with the clinical presentation of medial joint-line pain and McMurray.
Lateral MeniscusNormal
Normal triangular morphology and signal of the anterior and posterior horns. No tear, no displaced fragment.
Anterior Cruciate Ligament (ACL)Intact
Continuous low-signal fibers from the femoral footprint to the tibial attachment. Normal slope. No surrounding edema.
Posterior Cruciate Ligament (PCL)Intact
Continuous, gracefully arching, low-signal fibers; normal thickness.
Collateral Ligaments & Patellar TendonIntact
MCL and LCL complexes intact and normal in signal. Patellar and quadriceps tendons normal.
Articular CartilagePreserved
Hyaline cartilage maintained over the medial femoral condyle, medial tibial plateau, lateral compartment, and patellofemoral compartment. No focal full-thickness defect identified.
Bone Marrow / Joint FluidEdema, Effusion
Mild bone marrow edema in the medial tibial plateau (subchondral, in proximity to the meniscal injury) — likely reactive. Moderate joint effusion. No bone bruise pattern indicative of a high-energy injury.
Other Soft TissuesNormal
Popliteal fossa unremarkable; no Baker's cyst. Iliotibial band intact. No loose bodies in the joint.

Differential / Findings Synthesis

  • Medial meniscus posterior horn tear (acute, traumatic)Confirmed
    Imaging shows a true tear with corresponding clinical exam (medial joint line pain, locking, positive McMurray).
  • Reactive bone marrow edema, medial tibial plateauPresent
    Common adjacent finding; not indicative of fracture in this morphology.
  • Concomitant ligament injuryExcluded
    All four major ligaments intact, lowering the index for a multi-ligamentous injury pattern.

Analytical Summary & Recommendations

Imaging impression

Posterior horn medial meniscus tear with reactive bone marrow edema and joint effusion. Cruciate and collateral ligaments preserved. Cartilage grossly preserved. Findings are consistent with the clinical presentation.

Recommended next steps (clinical correlation)

  • Orthopaedic / sports medicine consultation for shared decision on management
  • Initial conservative management (RICE, NSAIDs, structured physical therapy) reasonable for many patients with medial meniscus tears, particularly those without persistent mechanical symptoms [Beaufils P, Knee Surg Sports Traumatol Arthrosc 2017]
  • Arthroscopic evaluation / partial meniscectomy or repair if mechanical locking persists, conservative therapy fails, or the tear is amenable to repair (peripheral, longitudinal pattern) [ESSKA Meniscus Consensus 2017]
  • Activity modification: avoid pivoting, deep squats, twisting motions until cleared
  • Rehabilitation focus on quadriceps strengthening, hip mechanics, neuromuscular control

Key Questions for Your Physician

  • Is my tear a candidate for repair, or will it likely require partial removal (meniscectomy)?
  • How long should I attempt physical therapy before considering surgery?
  • What is the realistic timeline to return to recreational sports either way?
  • What activities should I avoid in the meantime, and what can I safely do?
  • Long-term, will this increase my risk of arthritis?

What This Means for You

Your MRI shows a tear in the medial (inner) meniscus of your right knee — specifically in the posterior portion. The meniscus is a C-shaped piece of cartilage that cushions your knee and helps it move smoothly. The good news: the main ligaments (ACL, PCL, MCL, LCL) are all intact, and the joint cartilage is well preserved.

Many medial meniscus tears can be treated without surgery with rest, anti-inflammatories, and a structured physical therapy program — particularly when there is no persistent locking. If symptoms persist or significant locking continues despite conservative care, an orthopaedic specialist may recommend arthroscopic surgery, which is a same-day, minimally invasive procedure. Whether your tear is best treated by repair (preserving the meniscus, longer recovery) versus partial removal (faster recovery, but small loss of cushion) depends on the tear pattern and location, and is decided in consultation with your surgeon.

Most people return to recreational sports within 3–6 months, depending on the chosen path. For now: avoid pivoting, deep squats, and twisting movements. Start a focused rehabilitation plan with a physical therapist.

Analysis Confidence 93%

High confidence in tear identification, ligamentous integrity, and cartilage assessment. Tear repairability is best determined arthroscopically; MRI provides the best available pre-surgical assessment.

References

  1. De Smet AA, Tuite MJ. Use of the "two-slice-touch" rule for the MRI diagnosis of meniscal tears. AJR Am J Roentgenol 2006;187(4):911–4.
  2. Beaufils P, Becker R, Kopf S, et al. Surgical management of degenerative meniscus lesions: the 2016 ESSKA meniscus consensus. Knee Surg Sports Traumatol Arthrosc 2017;25(2):335–346.
  3. Englund M, Roemer FW, Hayashi D, Crema MD, Guermazi A. Meniscus pathology, osteoarthritis and the treatment controversy. Nat Rev Rheumatol 2012;8(7):412–9.
  4. Sihvonen R, Paavola M, Malmivaara A, et al. Arthroscopic partial meniscectomy versus sham surgery for a degenerative meniscal tear. NEJM 2013;369(26):2515–24.
  5. ACR Appropriateness Criteria — Acute Trauma to the Knee. American College of Radiology 2020.