What are the recommended postoperative care steps—including brace immobilization, weight‑bearing restrictions, pain management, antibiotic prophylaxis, and venous thromboembolism prophylaxis—after patellar tendon repair?

Postoperative Management After Patellar Tendon Repair

Begin immediate weight-bearing as tolerated with a hinged knee brace locked in extension for 2-4 weeks, initiate early controlled motion within the first week, and use standard VTE prophylaxis with enoxaparin 40 mg daily or equivalent LMWH for at least 7-10 days postoperatively.

Immobilization and Bracing

The evidence strongly supports early mobilization over prolonged immobilization. Use a hinged knee brace locked in full extension for 2-4 weeks postoperatively 1, 2, 3. This protective bracing allows controlled motion while preventing excessive stress on the repair during early healing.

• Remove the locked brace once adequate quadriceps control is achieved (typically 2 weeks)
• The brace provides protection during ambulation while permitting early range of motion exercises
• Avoid rigid casting for 6 weeks—this outdated approach leads to stiffness, patella baja, and prolonged weakness 1

Weight-Bearing Protocol

Allow full weight-bearing as tolerated immediately postoperatively 1, 2. The research demonstrates that early weight-bearing (starting 7-10 days post-surgery) produces similar or superior outcomes compared to delayed weight-bearing protocols 4, 1.

• Patients can bear full weight with the brace locked in extension
• No need for prolonged non-weight-bearing restrictions
• Early loading accelerates return to function without increasing rerupture risk when the repair is adequately protected 1, 2

Range of Motion

Initiate controlled passive and active-assisted range of motion within the first week:

• Begin prone active knee flexion and passive extension exercises at 7-10 days 1
• Target 90 degrees flexion by 2 weeks
• Achieve 120 degrees flexion by 6 weeks 1
• Reach full flexion (matching contralateral knee) by 3-4 months 3
• Full active extension should be achieved by 2-4 weeks 3

Start patellar mobilization immediately postoperatively to prevent adhesions and patella baja 3.

Strengthening Protocol

Begin isometric quadriceps exercises (quad sets, straight leg raises) immediately postoperatively 4. Progress to:

• Active flexion and extension exercises after 6 weeks
• Progressive resistance training at 8-12 weeks
• Functional activities and sport-specific training at 3-6 months

The goal is 70-80% quadriceps strength compared to the contralateral leg by 1 year 2.

Venous Thromboembolism Prophylaxis

Administer pharmacologic VTE prophylaxis with enoxaparin 40 mg subcutaneously once daily (or equivalent LMWH) for at least 7-10 days postoperatively 5, 6. Patellar tendon repair qualifies as major lower extremity orthopedic surgery requiring prophylaxis.

Alternative regimens include:

• Dalteparin 5,000 units once daily
• Unfractionated heparin 5,000 units every 8 hours
• Consider extending prophylaxis up to 4 weeks in high-risk patients (obesity, prior VTE, prolonged immobility) 5

Mechanical prophylaxis (intermittent pneumatic compression) can be added but should not replace pharmacologic prophylaxis 5.

Pain Management

Use multimodal analgesia:

• Scheduled acetaminophen
• Opioids as needed for breakthrough pain (minimize duration)
• Ice/cryotherapy immediately postoperatively and ongoing 3
• Consider neuromuscular electrical stimulation in the first 4 weeks to reduce pain and facilitate quadriceps activation 3

NSAIDs can be used cautiously after the first 1-2 weeks once initial healing has begun, though some protocols restrict them longer 7. There is no strong evidence that short-term NSAID use impairs tendon healing in this context.

Antibiotic Prophylaxis

Standard perioperative antibiotic prophylaxis (single preoperative dose of cefazolin 2g IV or equivalent) is sufficient. No extended postoperative antibiotics are indicated for routine patellar tendon repair.

Return to Activity

• Brace-free ambulation: 6-8 weeks 1
• Return to work (sedentary): 6-12 weeks
• Return to sport: 5-9 months based on functional testing 3
• Criteria should include: >85% quadriceps strength symmetry, full ROM, functional hop testing, and psychological readiness 3

Critical Pitfalls to Avoid

1. Do not immobilize in a rigid cast for 6 weeks—this causes preventable stiffness and weakness 4, 1
2. Do not delay weight-bearing beyond 2 weeks—early loading is safe and beneficial 1, 2
3. Do not neglect VTE prophylaxis—major lower extremity surgery carries significant thrombotic risk 5, 6
4. Do not skip patellar mobilization—adhesions and patella baja are common complications of immobilization 1
5. Monitor for loss of extension—this is the most common residual deficit and should be addressed aggressively in early rehabilitation 1

The evidence clearly favors accelerated rehabilitation with early motion and weight-bearing over traditional immobilization protocols, producing faster recovery and equivalent or better long-term outcomes 4, 1, 2.