MRI Knee Without Contrast — Dictation, Appropriateness, and Dose for Residents

What an MRI of the Knee Without Contrast Covers and What Attendings Look For

An outpatient MRI knee on a 25-year-old athlete with a pivot-shift injury lands on your worklist. The orthopedic surgeon is waiting for your read to schedule surgery, and your attending expects a precise description of the meniscal tear morphology, any associated ligamentous injuries, and the classic bone bruise pattern. You need to be fast, but you can’t afford to miss a subtle posterolateral corner injury or an osteochondral defect.

This is the bread and butter of musculoskeletal imaging. The MRI of the knee without contrast is the definitive non-invasive study for evaluating internal derangement. Your report needs to be a clear, structured roadmap for the referring clinician. For more high-yield guides, check out the residents and fellows resource hub.

Attendings expect a systematic evaluation covering these key structures:

• Menisci: Specifically, the presence, location (anterior horn, body, posterior horn), and morphology (radial, horizontal, longitudinal, complex, bucket-handle) of any tear. Remember the key principle: high signal contacting an articular surface on at least two sequences.
• Cruciate Ligaments: The integrity of the Anterior Cruciate Ligament (ACL) and Posterior Cruciate Ligament (PCL). Is the ACL a continuous, low-signal band, or is it discontinuous, edematous, or absent?
• Collateral Ligaments: The Medial Collateral Ligament (MCL) and Lateral Collateral Ligament (LCL) complexes. Grade MCL injuries from I (sprain) to III (complete tear).
• Cartilage and Bone: Any chondral defects, osteochondral lesions, or bone marrow edema patterns. Look for the classic “kissing contusions” of a pivot-shift injury or the subchondral edema of Spontaneous Osteonecrosis of the Knee (SPONK).
• Extensor Mechanism: The quadriceps and patellar tendons, patellar tracking, and the medial patellofemoral ligament (MPFL).
• Joint and Popliteal Fossa: Note any joint effusion, synovitis, or Baker’s cyst.

Your goal is to create a report that answers the clinical question efficiently and accurately, leaving no doubt about the extent of the injury.

Radiology Report Template for an MRI of the Knee Without Contrast

This template provides a reliable starting point for your dictations. You can adapt it into a macro in your voice recognition software.

Technique

Multiplanar, multisequence magnetic resonance imaging of the [right/left] knee was performed without the administration of intravenous contrast. Sequences include sagittal proton density (PD) and T2-weighted fat-saturated images, coronal PD and T2-weighted fat-saturated images, and axial PD-weighted fat-saturated images.

Findings

Menisci:
Medial Meniscus: [Normal in morphology and signal. OR: Describe tear location, type, and extension to the articular surface.]
Lateral Meniscus: [Normal in morphology and signal. OR: Describe tear location, type, and extension to the articular surface.]

Cruciate Ligaments:
Anterior Cruciate Ligament (ACL): [Intact. OR: Sprain, partial tear, or full-thickness tear with description of fiber discontinuity and signal.]
Posterior Cruciate Ligament (PCL): [Intact. OR: Sprain, partial tear, or full-thickness tear.]

Collateral Ligaments:
Medial Collateral Ligament (MCL): [Intact. OR: Grade I sprain, Grade II partial tear, or Grade III complete tear.]
Lateral Collateral Ligament (LCL) Complex: [Intact. OR: Describe injury to the LCL, biceps femoris tendon, or popliteus tendon.]

Extensor Mechanism:
Quadriceps Tendon: [Intact.]
Patella: [Normal alignment. No evidence of dislocation. OR: Lateral patellar subluxation/tilt.]
Patellar Tendon: [Intact.]
Medial Patellofemoral Ligament (MPFL): [Intact. OR: Sprain or tear.]

Articular Cartilage:
Patellofemoral Compartment: [Normal thickness and signal. OR: Describe chondral thinning, fissure, or full-thickness defect.]
Medial Tibiofemoral Compartment: [Normal thickness and signal. OR: Describe chondral thinning, fissure, or full-thickness defect.]
Lateral Tibiofemoral Compartment: [Normal thickness and signal. OR: Describe chondral thinning, fissure, or full-thickness defect.]

Bone Marrow and Osseous Structures:
[No fracture, contusion, or aggressive osseous lesion. OR: Describe bone marrow edema pattern, occult fracture, or other lesion.]

Joint Space and Popliteal Fossa:
Joint Effusion: [None, small, moderate, or large.]
Synovium: [Not thickened.]
Popliteal Fossa: [Unremarkable. No Baker’s cyst or vascular abnormality.]

Visualized Musculature and Soft Tissues:
[Unremarkable.]

Impression

1. [Example: Acute full-thickness tear of the anterior cruciate ligament.]
2. [Example: Complex tear of the posterior horn of the medial meniscus.]
3. [Example: Bone contusions involving the lateral femoral condyle and posterior lateral tibial plateau, consistent with a pivot-shift mechanism of injury.]
4. [Example: Moderate joint effusion.]

Free Template Sources for Radiology Residents

Before we get into AI-driven tools, it’s worth knowing that two great free repositories exist for standard templates. They are excellent for building your personal macro library, especially during your first couple of years.

• RadReport.org: Curated by the Radiological Society of North America (RSNA), this is a comprehensive library of peer-reviewed templates covering nearly every modality and subspecialty.
• Radiology Templates (AU): An excellent, straightforward resource maintained by Australian radiologists with clean, practical templates for daily use.

Bookmark them. They’re a lifesaver when you encounter a rare study or just want to see how others structure a complex report.

The Next-Level Move: From Free-Form Dictation to Structured Report

The challenge with manual templates is the constant clicking and navigating. You see the findings, but then you have to stop, find the right section in your template, and fill in the blanks. It breaks your diagnostic flow.

This is where AI-powered dictation tools can streamline your workflow. Instead of dictating into a rigid template, you can state the positive findings in free form, like you’re talking to a colleague: “acute ACL tear with a bucket handle tear of the medial meniscus and a pivot shift bone contusion.” GigHz Precision AI is designed to parse that free-form dictation and automatically populate the correct sections of a structured, attending-ready report. It uses pre-loaded templates from the American College of Radiology (ACR) and Society of Interventional Radiology (SIR) to ensure your output is standardized and complete.

For this MRI Knee template, no specific Clinical Decision Support (CDS) popups fire. The focus is on turning your diagnostic insights directly into a clean, structured report without the manual overhead.

When Should You Order an MRI of the Knee? ACR Appropriateness Criteria

The American College of Radiology (ACR) provides evidence-based guidelines to help clinicians choose the right study. For knee imaging, the decision often hinges on the acuity of the injury and the findings from initial radiographs.

For a patient with acute trauma to the knee but no focal tenderness or effusion who is able to walk, initial imaging is often not needed. However, if there is focal tenderness, effusion, or an inability to bear weight, radiographs are the appropriate first step. When radiographs are negative but there’s a high suspicion for an occult fracture or internal derangement (like a meniscal or ligamentous tear), an MRI of the knee without contrast is Usually Appropriate as the next study in both adults and children. Similarly, for known tibial plateau fractures seen on X-ray, MRI is Usually Appropriate for evaluating associated soft-tissue injuries to guide surgical planning.

In cases of chronic knee pain, radiographs are again the recommended initial imaging. If X-rays are negative or only show a joint effusion, an MRI of the knee without contrast is Usually Appropriate to assess for internal derangement. MRI is also Usually Appropriate for further evaluating findings like osteochondritis dissecans (OCD), suspected meniscal or cartilage repair failure, or signs of prior osseous injury (e.g., a Segond fracture) seen on the initial radiograph.

These guidelines, from the ACR Appropriateness Criteria on Acute Trauma to the Knee and Chronic Knee Pain, help ensure patients receive the most effective imaging while avoiding unnecessary studies.

MRI of the Knee Protocol Parameters — Sequences, Slices, and Pitfalls

A standard non-contrast knee MRI protocol is designed to provide a comprehensive assessment of all the key anatomical structures. The scan typically takes 25-30 minutes. The patient is positioned supine, feet-first, with the knee in a dedicated coil and slightly externally rotated (about 15 degrees) to align the ACL with the sagittal imaging plane.

The core sequences are outlined below. While 1.5T scanners are perfectly acceptable, 3T provides superior signal-to-noise ratio, which can improve cartilage detail and potentially shorten scan times.

Key Technical Parameters:

• Slice Thickness: 3-3.5 mm
• Gap: 0.3-0.5 mm
• Field of View (FOV): 140-160 mm
• Matrix: 320 x 256 or higher

Common Protocol Pitfalls:

A common point of discussion is the optional sagittal oblique sequence angled along the ACL. While not always standard, it can be invaluable when the primary clinical question is an ACL tear, as it visualizes the entire ligament in a single plane. Another optional add-on includes 3D cartilage-specific sequences (like DESS or T2 mapping), which are typically reserved for advanced cartilage assessment or pre-operative planning.

3+ Months Free for Radiology Residents and Fellows

Look like a rockstar on your reports. We’re offering trainees extended free access to GigHz Precision AI. The value proposition is simple: dictate your positive findings in free form, and the AI generates a complete, structured report using ACR and SIR templates. The appropriate Clinical Decision Support (CDS) for complex findings like liver or kidney lesions fires automatically, guiding you to the right classification.

In return, all we ask is your feedback so we can keep improving the product for trainees. This is a real tool, not a demo, and it’s designed to make your call shifts and daily readouts smoother.

Signup is simple. No credit card, no long forms. To get set up, just provide these three items:

1. Your PGY year (e.g., PGY-2, PGY-4)
2. Your training type (radiology residency or fellowship specialty)
3. Your training program / hospital name

To get started, apply for the residents free-access program and reply to the application email with the information above.

Frequently Asked Questions (FAQ)

Is GigHz Precision AI HIPAA-compliant?

Yes. The platform is designed for de-identified workflows by default. It processes the clinical content of your dictation without requiring Protected Health Information (PHI). All data is handled within a secure, HIPAA-compliant environment.

Does this require a complex IT setup?

No. It’s a browser-based tool that requires no local software installation or special permissions from your hospital’s IT department. You can access it from any hospital workstation, call-room computer, or personal laptop.

How does this work with PowerScribe or other dictation systems?

It works alongside your existing system. You can dictate into the Precision AI interface, and once the structured report is generated, you can copy and paste it directly into your PACS/RIS or voice recognition editor (like PowerScribe or Fluency) for final sign-off.

Can I use this on a call-room computer or my iPad?

Yes. Because it’s web-based, it works on any device with a modern browser, including desktops, laptops, and tablets like the iPad. This makes it easy to use whether you’re in the reading room or on call.

Can I customize the templates?

Yes. While the system comes pre-loaded with standardized ACR and SIR templates, you have the ability to customize them to match your institution’s specific formatting preferences or your attending’s preferred style.

What happens to my access after residency or fellowship?

We offer continuity plans for graduating residents and fellows who want to continue using the platform in their practice. Special pricing is available for early-career radiologists transitioning from training to attending roles.

Free GigHz Tools That Pair With This Article

Three free tools that complement the material above:

• ACR Appropriateness Criteria Lookup — Type an indication or clinical scenario in plain language and get the imaging studies the ACR rates for it, with adult and pediatric radiation levels. Built directly from 297 ACR topics, 1,336 clinical variants, and 15,823 procedure ratings.
• GigHz Imaging Protocol Library — A searchable library of 131 imaging protocols with the physics specs surfaced and the matching ACR Appropriateness Criteria alongside. Plain-English narratives readable in 60 seconds, organized by modality.
• GigHz Radiation Dose Calculator — Pick the imaging studies a patient has had and see total dose in millisieverts (mSv) with comparisons to natural background radiation, transatlantic flights, and chest X-rays. Useful for shared decision-making.

Reviewed by Pouyan Golshani, MD, Interventional Radiologist — May 7, 2026