ACL Graft Options: Patellar Tendon, Hamstring, Quad and Allograft
When the ACL tears, it cannot be stitched back together. Reconstruction replaces it with a tissue graft that serves as a scaffold for new ligament growth. Choosing between graft sources is one of the most important pre-surgical decisions, and the right choice depends on age, activity level, anatomy and individual priorities.
The Four Main Graft Options
Bone-Patellar Tendon-Bone (BTB) Autograft
The surgeon harvests the central third of the patellar tendon along with a small bone plug from the kneecap and the tibial tubercle. This creates a graft with bone on each end, allowing bone-to-bone healing in the tunnels (typically 6 to 8 weeks versus 8 to 12 weeks for soft-tissue-only grafts).
Pros: Fastest tunnel healing, strongest initial fixation, lowest retear rates in young athletes, longest track record.
Cons: Anterior knee pain and kneeling discomfort in 10 to 20% of patients, risk of patellar fracture (less than 1%), slightly more painful early recovery.
Hamstring Autograft
The semitendinosus and gracilis tendons are harvested from the medial (inner) side of the knee, folded and bundled to create a multi-strand graft. Modern quadrupled hamstring grafts are among the strongest graft constructs available.
Pros: Less anterior knee pain, smaller incision, preserved extensor mechanism, strong when properly tensioned.
Cons: Slower tunnel healing (soft tissue, no bone plugs), 5 to 10% residual hamstring weakness, tunnel widening in some patients.
Quadriceps Tendon Autograft
A strip of tendon is harvested from the quadriceps tendon above the kneecap, with or without a bone plug from the patellar surface. This graft option has gained significant popularity since 2018 and is now the primary choice for many high-volume ACL surgeons.
Pros: Thick, strong graft (8 to 10mm), less donor-site pain than BTB, can include a bone plug for tunnel healing, versatile sizing.
Cons: Shorter published outcome data (though growing rapidly), some patients report quadriceps soreness during recovery.
Allograft (Donor Tissue)
Tissue from a deceased donor, processed and sterilized. Common allograft sources include Achilles tendon, tibialis anterior/posterior, BTB and peroneus longus.
Pros: No donor-site morbidity (no additional harvest incision or pain), shorter surgery time, available in large sizes.
Cons: Significantly higher retear rates in patients under 25 (2 to 4 times higher than autograft), slower biological incorporation, small risk of disease transmission (extremely rare with modern processing).
Head-to-Head Comparison
ACL Graft Options Compared
| Factor | BTB | Hamstring | Quad Tendon | Allograft |
|---|---|---|---|---|
| Graft strength (N) | ~2,900 | ~4,100 (quadrupled) | ~2,350 | Varies by source |
| Retear rate (young athletes) | 3 to 6% | 5 to 8% | 3 to 7% | 15 to 25% |
| Anterior knee pain | 10 to 20% | 3 to 5% | 5 to 8% | None (no harvest) |
| Tunnel healing | 6 to 8 wk (bone-bone) | 8 to 12 wk (soft tissue) | 6 to 10 wk | 8 to 16 wk |
| Kneeling discomfort | Common | Rare | Rare | None |
| Best for | Young pivoting athletes | Patients prioritizing comfort | Growing surgeon preference | Over-40, multi-ligament, revision |
Retear Rates in Athletes Under 25 (5-Year Follow-Up)
Decision Framework
A reasonable approach based on current evidence:
- Young athlete (under 25) returning to cutting/pivoting sport: BTB or quad tendon autograft. Avoid allograft.
- Recreational athlete (25-40) with moderate demands: Any autograft based on surgeon preference and patient priorities. Hamstring if kneeling matters for work. Quad tendon increasingly popular as the balanced option.
- Patient over 40, lower demands: Any autograft or allograft. The retear rate penalty of allograft is less significant in this population because of lower activity levels.
- Revision ACL reconstruction: Allograft or autograft from the opposite knee, depending on what was used in the primary surgery and the condition of the tunnels.
- Multi-ligament reconstruction: Allograft is often necessary because multiple grafts are needed and donor sites are limited.
Considering a full replacement instead? Read the decision guides at jointreplacements.co.
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Message Us on WhatsAppFrequently Asked Questions
Which ACL graft has the lowest retear rate?
Bone-patellar tendon-bone (BTB) autograft consistently shows the lowest retear rates in large registry studies, particularly in young athletes. The Danish ACL Registry reported a 3.1% revision rate for BTB versus 4.9% for hamstring at 5 years. However, the difference narrows in older or lower-demand patients.
Do surgeons have a preferred graft?
Surgeon preference varies by training and regional practice patterns. In the United States, hamstring and BTB are roughly equally common, with quadriceps tendon use growing rapidly. In Scandinavia, hamstring is dominant. The best graft is the one your surgeon performs most often and has the best outcomes with.