You've torn your ACL and you're heading into reconstruction. The graft choice is one of the biggest decisions you'll make with your surgeon — and there is no universally "best" graft. Here's how LAOSS sports medicine surgeons weigh hamstring autograft, bone-patellar tendon-bone (BPTB), quadriceps tendon, and allograft against your sport, your job, your sex, your anatomy, and your goals.
Hamstring spares the kneecap. BPTB heals bone to bone.
ACL reconstruction is the same operation regardless of graft choice — your surgeon drills a tunnel through the tibia and the femur, passes a new ligament through, and fixes both ends. What changes is what we use to make that new ligament, and where on your knee we harvest it from.
Hamstring autograft uses two of your own hamstring tendons — the semitendinosus, sometimes with the gracilis. We harvest them through a small incision on the front of the tibia, fold them into a 4-strand (or sometimes 5- or 6-strand) bundle, and pass that through the tunnels. The harvest is quick and the incisions are small. The trade-off: your hamstrings are temporarily weaker (and a small percentage of patients report lingering hamstring weakness at 1+ year), and tendon-to-bone healing inside the tunnels takes a bit longer than bone-to-bone.
Bone-patellar tendon-bone (BPTB) uses the middle third of your own patellar tendon, harvested with a small bone plug at each end — one from your kneecap, one from your tibia. Those bone plugs sit in the tunnels and heal bone-to-bone, which is the strongest, fastest, most predictable form of biological fixation we can achieve. The trade-off: a vertical incision on the front of the knee, and a real risk of anterior knee pain with kneeling that can persist for months and (in some patients) longer.
Quadriceps tendon autograft is the rising third option. We harvest from the quad tendon just above the kneecap, with or without a bone plug. The graft is thick and strong, hamstring strength is preserved, and anterior knee pain rates are lower than BPTB.
Allograft (cadaver tendon) avoids harvest entirely, but in patients under 25 the published re-rupture rate is significantly higher — we rarely use it for primary ACL reconstruction in young athletes.
This procedure repairs your knee after a tear of the anterior cruciate ligament. Whether your surgeon uses hamstring, patellar tendon, or quadriceps tendon graft, the goal is the same — restore the central pivot of your knee so you can cut, pivot, and trust the joint again.
Animations licensed from ViewMedica · Swarm Interactive
The anterior cruciate ligament runs diagonally from the back of the femur to the front of the tibia inside the joint — it's the central pivot that keeps the tibia from sliding forward and rotating out from under you. A torn ACL is replaced, not repaired, with biological tissue strong enough to behave like a ligament once it heals into the bone tunnels. The three autograft donor sites — hamstring, patellar tendon, quadriceps tendon — are all close enough that we can harvest through the same skin field. Each has a different harvest morbidity, a different fixation profile, and a different recovery story.
There isn't a universally best graft — and any surgeon who tells you there is one is selling you their preferred tool, not your best answer. The honest decision usually breaks down along five axes: sport demand, kneeling demand, sex and age, prior injuries, and concurrent procedures.
Sport demand. For elite-level cutting/pivoting athletes — Division-I soccer, college basketball, professional football — the literature trends toward BPTB as the lowest re-rupture graft in young, high-demand patients, particularly in revision settings. Quadriceps tendon is closing that gap. For recreational athletes, weekend warriors, and general fitness, all three autografts perform similarly well in published trials at 2 years.
Kneeling demand. This is the most under-appreciated question. If you kneel for your job — carpenter, plumber, electrician, mechanic, flooring, military — or for your faith, BPTB harvest can leave you with anterior knee pain that limits kneeling for months and, in a minority of patients, indefinitely. For these patients we usually steer toward hamstring or quad tendon.
Sex and age. Female athletes under 25 in cutting sports have the highest published re-rupture rates regardless of graft, but several studies suggest BPTB and quad tendon outperform hamstring in this specific population. Patients over 30 with moderate demand have low re-rupture rates with any autograft.
Prior injuries. Pre-existing patellar tendinopathy, jumper's knee, prior patellar fracture, or chronic anterior knee pain push us away from BPTB. Pre-existing hamstring injury, hamstring-dominant sport, or planned return to sprint-heavy sport push us away from hamstring.
Concurrent procedures. If you also need a meniscus repair, ramp lesion repair, anterolateral ligament reconstruction (ALL/LET), or a high tibial osteotomy, those decisions interact with graft choice — sometimes more than graft choice itself.
Most patients fit one path more cleanly than the other. Here's how we sort it at your pre-op consult, and where quadriceps tendon fits in.
When sparing the front of the knee, preserving extensor strength, and a smaller cosmetic footprint matter most.
When the strongest early bone-to-bone fixation and the lowest re-rupture rate in high-demand sport matter most.
Re-rupture rates and harvest-site morbidity are where these two grafts diverge most. Here's the honest read on the data.
Hamstring autograft is the most-used ACL graft worldwide. Harvest morbidity is low, but hamstring strength can lag for months, and re-rupture risk runs slightly higher in young, female, cutting athletes.
Bone-to-bone healing is the gold standard for early fixation. The trade-off is harvest morbidity on the front of the knee — kneeling pain and a small risk of patellar fracture.
This is the question patients ask most after they leave their pre-op consult. The honest answer depends on the graft, your job, and your knee anatomy.
The front of the knee is left alone. Most hamstring autograft patients can kneel without pain by 4–6 months, often sooner.
The donor site on the front of the patellar tendon and the bone plug harvest from the kneecap can stay tender on direct pressure. For some patients this fades; for others it persists.
We won't oversell either graft. Here's the honest read of the modern ACL literature, including the MOON cohort, MARS revision data, and the major randomized trials.
Modern systematic reviews show hamstring autograft achieves equivalent IKDC and KOOS scores at 2+ years to BPTB. Re-rupture trends higher in specific high-risk subgroups.
BPTB has the longest track record and historically the lowest re-rupture rate in elite cutting athletes — but at the cost of measurable anterior knee pain.
These checklists are a starting point — the final call is at your pre-op consult with imaging, exam, and a real conversation about your sport, your work, and your goals.
Hamstring autograft is most often the right call when sparing the front of the knee matters and your sport demand is moderate.
BPTB is most often the right call when the strongest early fixation and lowest re-rupture rate are the priorities.
Recovery timelines are broadly similar across autografts — the differences live in the early weeks and in sport-specific milestones.
The first 6 weeks are about protecting the graft, calming swelling, restoring full extension, and getting flexion back. Crutches and a brace are typical, weaning with PT.
Progressive strengthening, neuromuscular work, jogging starts around month 3–4, agility and plyometrics follow when strength benchmarks are met.
Return-to-sport testing typically lands at 9–12 months, not 6. Re-rupture risk is highest in the first 12 months — patience and clearance testing both matter.
Hamstring and BPTB aren't the only two grafts — they're just the two most-discussed. Two other options come up in pre-op consults at LAOSS.
Quadriceps tendon autograft has grown rapidly over the past decade and now accounts for a meaningful share of primary ACL reconstructions at high-volume sports medicine centers. We harvest from the quadriceps tendon just above the kneecap, with or without a small bone plug. The graft is thick and strong (often thicker than a 4-strand hamstring), the front of the knee is largely spared compared to BPTB, and hamstring strength is preserved. Anterior knee pain rates appear lower than BPTB, and short- to mid-term outcomes are equivalent to hamstring and BPTB in the published literature. For many patients — kneeler-athletes who want stronger early fixation than hamstring without the BPTB harvest cost — quad tendon is a strong choice. We use it often.
Allograft (cadaver tendon — patellar, Achilles, tibialis anterior) avoids harvest morbidity entirely. The cost is biology: published re-rupture rates in patients under 25 run roughly 2–4 times higher than autograft in the same age group. For primary ACL reconstruction in a young, active patient, we rarely recommend allograft. For patients over 30–40 with moderate demand, for revision ACL where autograft sites have been used, or for specific anatomic constraints, allograft is a reasonable option.
A few patients ask about internal brace augmentation or suture tape augmentation — adding a high-strength suture alongside the biological graft. The data are early but encouraging for select indications. We discuss it case-by-case.
ACL reconstruction is a well-studied operation with a strong safety record. Most risks are shared across grafts; some are graft-specific.
Hamstring autograft is the most-used ACL graft worldwide. Most risks are minor and recover with structured PT.
BPTB has the longest published track record. Risks cluster at the donor site on the front of the knee.
Every ACL reconstruction at LAOSS is performed by a fellowship-trained sports medicine surgeon who personally evaluates you in clinic, performs your surgery, and follows you through return-to-sport. Our surgeons each have deep experience with hamstring, BPTB, and quadriceps tendon autograft, and they share a non-negotiable principle: the right graft is the one that fits your sport, your job, your anatomy, and your goals — not the one we happen to like best. We walk through the trade-offs in your pre-op consult, look at your imaging together, and make the call with you. Same surgeon, every visit, every step of recovery.
Tore my ACL playing soccer. Dr. Stepanyan walked me through hamstring vs patellar like I was a teammate, not a patient. We picked BPTB. Back on the pitch at 10 months.
Book a pre-op consult at any of our eight Los Angeles-area offices. Our sports medicine surgeons will examine your knee, review your imaging on-site, talk through hamstring, BPTB, and quadriceps tendon, and help you make the call together — for your sport, your job, and your goals.
