Management of Complications Post-Bilateral TKA

Diagnostic Approach

The American College of Radiology recommends beginning with plain radiographs of the knee to evaluate for aseptic loosening, osteolysis, component malposition, or periprosthetic fracture, as these are the most common causes of late pain after TKA 1, 2
Characterize the pain pattern precisely, as pain on weight-bearing suggests aseptic loosening or component wear, while night pain or pain at rest raises concern for infection 2, 3
Assess for infection signs, such as warmth, erythema, fever, or systemic symptoms, which warrant immediate infection workup via joint aspiration, as periprosthetic infection is a serious complication requiring urgent management 2
Evaluate for instability, as aseptic loosening is a leading cause of late-stage failure and often coexists with instability and osteolysis 1, 4

Obtain weight-bearing radiographs of the knee to assess component positioning, alignment, progressive lucencies >2mm, and osteolysis, as recommended by the American College of Radiology 5, 2
If radiographs suggest aseptic loosening or osteolysis, CT knee without IV contrast is the preferred modality for quantifying osteolysis and assessing the bone-implant interface, with a rating of 8/9 for appropriateness 5, 1
If component rotation or malposition is suspected, CT scan without IV contrast is the imaging modality of choice, with a rating of 9/9 6
If infection cannot be excluded clinically, proceed to joint aspiration for cell count, culture, and sensitivity after reviewing radiographs 2

The American College of Sports Medicine recommends NSAIDs as first-line pain management for inflammation control in IT band syndrome 3
Consider corticosteroid injection if visible swelling or pain with ambulation persists for more than 3 days after initiating conservative treatment, with ultrasound guidance rated 7/9 for appropriateness for soft tissue evaluation 6

The British Journal of Sports Medicine recommends measuring quadriceps and hamstring strength bilaterally to quantify the deficit, and performing isometric quadriceps exercises when they provoke no pain 7
Electrostimulation in combination with conventional rehabilitation may improve muscle strength for up to 2 months, though long-term functional benefit is inconclusive, with a recommendation to continue structured rehabilitation for 9-12 months depending on functional goals 7

Do not dismiss lateral knee pain as simple IT band syndrome without ruling out aseptic loosening, as aseptic loosening is a major cause of late failure and can present with lateral-sided pain 1, 4
Do not obtain bone scans routinely, as positive bone scans occur in 12.5% of asymptomatic knees at 2 years post-TKA, making interpretation difficult 4
Do not delay surgical referral if conservative IT band treatment fails after 3 months or if radiographs show concerning findings, with a recommendation to refer back to the orthopedic surgeon 6, 2

The American College of Radiology recommends annual weight-bearing radiographs for detecting subclinical wear and osteolysis 6, 2