MRI of Both Knee Joints — a Side-by-Side Study
A bilateral knee MRI images the left and right knee in the same sitting, so the radiologist can read one joint against the other rather than in isolation. That direct comparison is the point of the study: subtle cartilage loss, early inflammation and asymmetric wear are far easier to call when a reference side sits alongside on the same report.
When Both Knees Are Scanned Together
A bilateral study is ordered when the problem is not confined to one side, or when the healthy side is needed as a baseline:
Pain in both knees: bilateral osteoarthritis, chondromalacia or patellofemoral pain affecting both joints.
Systemic and symmetrical joint disease: rheumatoid arthritis, gout or other inflammatory conditions that typically strike both sides.
Comparison imaging: when the radiologist needs the unaffected knee to judge how far the affected one has changed.
Surgical planning: assessing both joints before bilateral or staged knee replacement.
How It Differs from a Single-Knee MRI
Two complete sets of sequences are acquired, one per knee, so table time is longer than a single-joint study — usually 40 to 55 minutes rather than 20 to 30. Both knees are positioned and imaged in the same appointment, and the findings come back as one report covering the pair.
Preparing for a Bilateral Knee MRI
Wear loose, metal-free clothing and remove jewellery, watches, hairpins and magnetic-strip cards before entering the scan room. Because you will be on the table longer, use the washroom beforehand and mention any back pain or difficulty lying flat — positioning support can be arranged. Declare implants, a pacemaker, metallic fragments or pregnancy at screening.
During the Scan
You lie on your back with both knees supported in the coil, and the scanner works through one knee and then the other. The knocking noise comes in bursts between sequences; earplugs or headphones are provided. The scan is painless, but staying still for the full duration matters — movement in the second half is the usual reason a set has to be repeated.
FAQs
Q1. What is an MRI Knee - Both Joints scan used for?
It evaluates the ligaments, menisci, cartilage and bone of both knees in one sitting, and lets the radiologist compare the two joints directly.
Q2. Why would a doctor advise scanning both knees together?
When both knees are painful or swollen, when a systemic condition such as rheumatoid arthritis is suspected, or when the healthy side is needed as a reference for the affected one.
Q3. How long does a bilateral knee MRI take?
Roughly 40 to 55 minutes — about twice a single-knee study, because each joint is imaged with its own set of sequences.
Q4. Is it cheaper than booking two separate knee scans?
Booking both joints as one study means a single appointment and a single combined report. Check the current rate for your centre on this page.
Q5. Do I get one report or two?
One report covering both knees, with the findings for each side set out separately and compared.
Q6. Does the scan use radiation?
No. MRI uses a magnetic field and radio waves. Tell the team about any implant, pacemaker, metallic fragment or pregnancy before you are screened.
Q7. What preparation is needed?
No fasting for a plain study. Wear metal-free clothing, arrive a little early for screening, and allow for the longer table time.
