Is starting meloxicam 7.5 mg once daily for pain and ordering an urgent MRI of the left knee appropriate after a patient reports knee pain with a popping sensation?

Initial Management Plan Assessment

Your plan is partially appropriate but incomplete: meloxicam 7.5 mg daily is reasonable for pain control, but a STAT MRI is premature and not indicated as initial imaging—you should start with plain radiographs of the knee first 1.

Imaging Algorithm for Acute Knee Trauma with Popping Sensation

Step 1: Initial Radiographs (Not MRI)

For any patient with acute knee trauma and a popping sensation, plain radiographs (anteroposterior and lateral views) are the mandatory first imaging study 1. The popping sensation raises concern for:

• Ligamentous injury (ACL tear)
• Meniscal tear
• Possible fracture

However, you must first rule out fracture with radiographs. A minimum of two views should be obtained, with the lateral view at 25-30 degrees of flexion to evaluate for joint effusion and lipohemarthrosis 1.

Step 2: When to Order MRI

MRI becomes appropriate only AFTER negative radiographs when you suspect internal derangement or occult fracture 1. The guideline explicitly states: "MRI is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee" 1.

If radiographs are negative but clinical suspicion remains high for soft tissue injury (which is likely given the popping sensation), then MRI is the next appropriate study. MRI has proven superior accuracy for:

• Bone marrow contusions and occult fractures
• Meniscal injuries (sensitivity ~90%)
• Ligamentous injuries including ACL tears 1

Pain Management with Meloxicam

Dosing Appropriateness

Meloxicam 7.5 mg once daily is an appropriate and evidence-based choice for knee pain 2, 3. This dose has demonstrated:

• Significant superiority over placebo for pain on movement (p < 0.01) 3
• Efficacy evident within 2 weeks of treatment 2
• Gastrointestinal tolerability comparable to placebo, which is a major advantage 2, 4

The 7.5 mg dose is the recommended starting dose for osteoarthritis, though your patient likely has acute traumatic injury rather than OA. Still, the anti-inflammatory and analgesic properties are beneficial.

Safety Considerations

Before prescribing meloxicam, verify the patient has no contraindications 5:

• No history of NSAID-associated GI bleeding (if present, combine with PPI or avoid NSAIDs entirely)
• No elevated cardiovascular risk (NSAIDs can worsen heart failure, hypertension, and increase MI risk)
• Not on anticoagulants (increases GI bleeding risk 5-6 fold) 5
• Age consideration: GI bleeding risk increases dramatically with age (1 in 110 for adults >75 years vs 1 in 2,100 for those <45 years) 5

Meloxicam has a favorable COX-2/COX-1 selectivity ratio, resulting in significantly fewer GI adverse effects compared to traditional NSAIDs like diclofenac or naproxen 4. Perforations, ulcerations, and bleeding occurred in only 0.1% of patients on meloxicam 7.5 mg 4.

Corrected Management Algorithm

1. Order plain radiographs first (AP and lateral views minimum)
2. Continue meloxicam 7.5 mg daily for pain control (appropriate dose)
3. If radiographs are negative and clinical examination suggests internal derangement (positive Lachman test, joint line tenderness, significant effusion), then order MRI
4. Consider adding gastroprotection (PPI) if patient has any GI risk factors, history of ulcers, or is >60 years old 5

Common Pitfall to Avoid

Ordering MRI as the initial study wastes resources and delays appropriate care. The ACR Appropriateness Criteria are explicit that radiographs must come first 1. Insurance will likely deny a STAT MRI without prior radiographs anyway.