What is a Quad Tendon Graft?
The quadriceps tendon autograft uses tissue from the tendon that connects your quadriceps muscle to your kneecap. It can be harvested with a bone plug from the patella (like BTB) or as a soft tissue-only graft. This graft has gained significant popularity over the past decade.
Key Characteristics
- Graft Source: Central portion of quadriceps tendon
- Configuration: Can include patellar bone plug or soft tissue only
- Thickness: Naturally 7-9mm thick (thickest autograft option)
- Strength: ~125% of native ACL (with bone plug)
Why Quad Tendon is Gaining Popularity
The quad tendon graft is increasingly chosen by surgeons because it offers advantages of other grafts while minimizing drawbacks:
- Thick graft: Naturally thick without needing to double
- Less anterior knee pain: Than BTB grafts
- Better kneeling: Harvest site above kneecap, not on it
- Bone block option: Allows bone-to-bone healing benefits
- Larger graft size: Consistent sizing across patient populations
Advantages & Disadvantages
✓ Advantages
- Thick, strong graft naturally
- Less anterior knee pain than BTB
- Better kneeling tolerance than BTB
- Bone block option for fast healing
- Consistent graft size availability
- Good for revision surgery
- Lower patellar fracture risk than BTB
✗ Disadvantages
- Relatively newer technique (less long-term data)
- Quadriceps weakness early on
- Suprapatellar incision (above kneecap)
- Some surgeons less experienced with technique
- Potential for suprapatellar pouch scarring
- Numbness around incision possible
Recovery Timeline
The quad tendon graft timeline is similar to BTB if a bone plug is used, or similar to hamstring if soft tissue only:
Protection Phase
- Locked brace at 0° for walking
- Weight bearing as tolerated
- Swelling control (ice, elevation, compression)
- Gentle quad sets (may feel inhibited)
- Ankle pumps and gentle ROM
Early Rehab
- Progress ROM: 90° by week 4, full by week 6
- Full extension is critical
- Wean off crutches (week 3-4)
- Begin stationary bike
- Quad activation focus (NMES may help)
Strengthening Phase
- Full ROM expected
- Progressive quad strengthening
- Closed chain exercises (squats, leg press)
- Balance and proprioception
- Pool exercises
Advanced Strengthening
- Running typically begins ~4 months
- Single-leg strengthening progression
- Sport-specific movement patterns
- Quad strength goal: 70%+ LSI
Return to Sport Prep
- Agility and plyometric training
- Sport-specific drills
- Strength goals: 85-90% LSI
- Hop test progression
Return to Sport
- Meet all return-to-sport criteria
- Quad LSI >90%, Hop tests >90%
- Psychological readiness (ACL-RSI >65)
- Gradual return to full sport participation
Quad Tendon-Specific Considerations
⚠️ Quadriceps Recovery Focus
Similar to BTB but with the harvest site above the kneecap. Key considerations:
- Early quad inhibition: Common due to harvest; NMES can help
- Aggressive quad activation: Quad sets multiple times daily
- Monitor for quad lag: Straight leg raise without lag is a key milestone
- Suprapatellar swelling: May persist longer than other grafts
- Protect but progress: Balance protection with early activation
The Harvest Site
Understanding your specific harvest site helps with recovery expectations:
- Location: Incision above the kneecap (not on it like BTB)
- Kneeling: Generally better tolerated than BTB
- Healing: Tendon defect fills in over 6-12 months
- Numbness: Small area of numbness is common and usually improves
Bone Plug vs. Soft Tissue Only
Your surgeon may have used either technique:
With Bone Plug
- Faster graft healing (bone-to-bone)
- Similar timeline to BTB
- Slightly more donor site morbidity
Soft Tissue Only
- Soft tissue healing (8-12 weeks)
- Less donor site trauma
- May have longer protection period
Key Exercises for Quad Tendon Recovery
Early Phase (Weeks 0-6)
Tip: NMES (electrical stimulation) can be very helpful for quad activation in the early weeks.
Strengthening Phase (Weeks 6-12)
What the Research Says
Outcomes
Early and mid-term studies show excellent results with quad tendon grafts, comparable to BTB and hamstring. The graft has gained significant acceptance among sports medicine surgeons over the past decade.
Graft Failure Rates
Current studies suggest re-rupture rates similar to other autografts (5-10%). Some surgeons believe the thick graft may offer advantages, though more long-term data is needed.
Donor Site Morbidity
Studies show less anterior knee pain than BTB grafts and similar or less kneeling pain. Quad weakness is comparable to other autografts when properly rehabilitated.
Revision Surgery
The quad tendon is often chosen for revision ACL surgery when other graft sites have been used. Its consistent thickness and availability make it an excellent backup option.
Frequently Asked Questions
Why did my surgeon choose a quad tendon graft?
Surgeons may choose quad tendon for various reasons: patient anatomy, desire to avoid BTB complications while having bone-to-bone healing, revision surgery, or surgeon preference based on their experience. It's become increasingly popular due to excellent outcomes.
Is this graft as proven as BTB or hamstring?
The quad tendon has less long-term data (20+ years) compared to BTB and hamstring simply because it's been used widely for less time. However, short and mid-term studies show excellent results, and it's now widely accepted as a primary graft choice.
Will I have trouble activating my quad?
Early quad inhibition is common with any ACL surgery, but may be slightly more pronounced with quad tendon harvest. Aggressive quad setting exercises and NMES (electrical stimulation) are very helpful in the first few weeks.
Will my quad tendon heal completely?
Yes, the quad tendon heals and regenerates. Studies show the harvest site fills in over 6-12 months. With proper rehabilitation, quad strength can be fully restored.
Can I kneel on my knee?
Generally, yes. The harvest site is above the kneecap, so kneeling tolerance is typically better than with BTB grafts. Most patients can kneel comfortably once fully healed.
Track Your Recovery
Use our tools to monitor your progress and psychological readiness: