Initial Evaluation and Management of Medial Right Knee Pain
Begin with plain radiography of the knee as the initial imaging study, including anteroposterior, lateral, and tangential patellar views, followed by a focused physical examination to localize the pain source and determine if conservative management or further imaging is warranted. 1
Diagnostic Approach
Initial Imaging
Radiography is the appropriate first-line imaging study for chronic knee pain without known trauma 1. The ACR Appropriateness Criteria emphasizes that approximately 20% of patients with chronic knee pain inappropriately receive MRI without recent radiographs, making plain films the critical first step 1.
Required radiographic views include:
- At least one frontal projection (AP, Rosenberg, or tunnel view)
- Tangential patellar view
- Lateral view of the affected knee 1
Physical Examination Components
The examination should systematically evaluate five key areas 2:
Inspection - Look for swelling, deformity, or asymmetry
Palpation - Identify specific points of medial tenderness:
- Medial joint line (meniscus or medial collateral ligament)
- Medial femoral condyle
- Pes anserine bursa (anteromedial tibia, 2-3 inches below joint line)
Range of motion - Active and passive flexion/extension
Strength testing - Quadriceps and hamstring function
Specialized maneuvers - Valgus stress testing at 0° and 30° flexion for MCL integrity 3
Consider Referred Pain Sources
If knee radiographs are unremarkable, obtain:
- Hip radiographs if clinical concern for hip pathology exists 1
- Lumbar spine imaging if lower back pathology is suspected 1
When to Advance to MRI
MRI without IV contrast is indicated when initial radiographs are normal or show only joint effusion but pain persists 1. MRI accurately identifies:
- Meniscal tears (though often incidental in patients >45 years)
- Articular cartilage damage
- Bone marrow lesions (BMLs) - associated with increased pain, especially in males 1
- Medial collateral ligament injuries
- Synovitis and effusion extent
Important Caveat
The majority of people over 70 have asymptomatic meniscal tears, and in patients 45-55 years old, the likelihood of meniscal tears is similar in painful versus asymptomatic knees 1. This means MRI findings must be correlated clinically and not all abnormalities require intervention.
Common Medial Knee Pain Etiologies
Medial compartment osteoarthritis - Most common cause of chronic knee pain 1
Medial collateral ligament injury - Most commonly injured knee ligament structure, typically from valgus stress 4, 3
Medial meniscus tear - Evaluate with McMurray test and joint line tenderness 5
Pes anserine bursitis - Tenderness 2-3 inches below medial joint line
Bone marrow lesions - New or increasing BMLs correlate with increased pain 1
Initial Treatment Strategy
For most medial knee injuries without fracture or severe instability:
Conservative management is appropriate initially 3:
- Control edema with ice and elevation
- Protected weight-bearing as tolerated
- Avoid significant stress on healing structures
- Physical therapy focusing on range of motion and strengthening
- NSAIDs for inflammatory pain 6
The majority of acute grade III medial collateral ligament injuries heal with nonoperative rehabilitation 3. Surgery is reserved for knee dislocations, multiligament injuries, or chronic injuries with persistent instability 3.
Red Flags Requiring Urgent Evaluation
- Inability to bear weight
- Inability to flex knee to 90 degrees
- Significant joint effusion with concern for hemarthrosis
- Signs of infection (fever, warmth, erythema)
- Neurovascular compromise
Consider arthrocentesis with point-of-care ultrasound guidance when joint effusion is present, particularly if infection or inflammatory arthropathy is suspected 2.