Management of Occasional Knee Pain at Postoperative Day 17 After ACL Reconstruction with Peroneus Longus Tendon
Occasional knee pain at postoperative day 17 after ACL reconstruction with peroneus longus tendon is expected and should be managed with continued supervised or unsupervised rehabilitation exercises, physical therapy modalities for pain control, and oral analgesics as needed, while monitoring for red flags that would indicate complications requiring intervention.
Expected Pain Timeline
Pain typically peaks on postoperative day 1-2 and progressively declines through the first week 1. At day 17, you are in the early rehabilitation phase where some residual pain is normal, particularly with mobilization and exercise. The peroneus longus graft specifically has been associated with lower postoperative pain scores compared to hamstring grafts in recent studies 2.
Pain Management Strategy
Pharmacologic Management
- Continue oral analgesics as needed (narcotic or non-narcotic based on pain severity)
- General trend shows decreasing narcotic use and increasing non-narcotic use over the first 2-3 weeks 1
- At day 17, most patients should be transitioning primarily to non-narcotic analgesics
Physical Therapy Modalities (Early Phase Adjuncts)
Physical therapy modalities are helpful as adjuncts when pain, swelling, and range of motion limitations persist 3. Consider:
- Continuous passive motion (CPM): While most beneficial in the first 3 postoperative days for pain medication reduction and swelling 3, its utility at day 17 is limited
- Ice, compression, elevation: Standard modalities for pain and swelling control
- Other modalities: Can facilitate earlier pain-free commencement of exercise rehabilitation 3
Exercise Rehabilitation
Exercise rehabilitation is the mainstay of ACLR rehabilitation 3. At day 17:
- Continue prescribed rehabilitation exercises (supervised or unsupervised based on patient motivation and access)
- Unsupervised rehabilitation can be followed by motivated, compliant patients who cannot afford supervised care 3
- Focus on range of motion restoration, quadriceps activation, and progressive strengthening
- Pain during exercises should be monitored but mild discomfort is acceptable
Red Flags Requiring Further Evaluation
Evaluate for complications if pain is:
Location-Specific Concerns
- Anterior knee pain: Could indicate graft impingement from tunnel malposition, cyclops syndrome (fibrovascular nodule proliferation), or patellofemoral problems 4
- Posterior-external pain: May suggest graft impingement 4
- Donor site pain: With peroneus longus grafts, ankle function should remain preserved 5, 6, 7
Pain Characteristics Requiring Intervention
- Severe, unremitting pain despite analgesics
- Pain associated with significant swelling (consider aspiration of tense effusions per AAOS consensus 8)
- Pain with mechanical symptoms (locking, catching)
- Progressive worsening rather than improvement
- Signs of infection (fever, erythema, warmth)
Advantages of Peroneus Longus Graft at This Stage
Your patient's use of peroneus longus tendon offers specific advantages:
- Lower postoperative pain scores compared to hamstring grafts 2
- Earlier mobilization and return to function in comparative studies 2
- Minimal donor-site morbidity: Ankle function preserved with excellent AOFAS scores 5, 7
- No anterior knee pain typically seen with patellar tendon grafts 4
- No thigh hypotrophy seen with hamstring grafts 5, 6
Monitoring Plan
- Continue current rehabilitation protocol
- Pain should continue gradual decline over coming weeks
- If pain persists beyond 4-6 weeks or worsens, consider imaging to evaluate for:
- Graft impingement
- Cyclops lesion
- Cartilage or meniscal pathology
- Tunnel position
The key distinction is between expected postoperative pain (managed conservatively) versus pathologic pain from complications (requiring diagnostic workup). At day 17 with occasional pain, conservative management with continued rehabilitation and analgesics is appropriate unless red flags are present.