Who Needs Bone-Patellar Tendon-Bone ACL Reconstruction?

Overview

Bone-patellar tendon-bone (BPTB) autograft uses the central third of the patient's own patellar tendon, with a bone plug from the kneecap and shin on either end, to reconstruct a torn ACL. Dr. Raffo, a high-volume ACL surgeon treating patients throughout Bethesda and greater Montgomery County, reaches for BPTB most often in high-level contact and collision athletes and in revision ACL surgery, where its bone-to-bone healing and long registry track record carry the most weight.

Who this is for

• High-level contact and collision-sport athletes, including football, wrestling, and rugby players, are frequently steered toward BPTB because of its long-standing registry performance in demanding knees.
• Revision ACL reconstruction patients are strong candidates for BPTB, particularly when the primary graft was hamstring and a different tissue plane is desirable.
• Patients whose occupation or sport requires prolonged kneeling — flooring, plumbing, wrestling, volleyball — should discuss the elevated kneeling-difficulty risk before choosing BPTB, since that tradeoff is specific to this graft.
• Patients with pre-existing patellofemoral pain, patella baja, or a narrow patellar tendon are generally not good candidates for BPTB and are better served by quadriceps tendon or hamstring autograft.

How I approach it

I reach for bone-patellar tendon-bone most often in the athletes for whom the stakes of a second failure are highest — high-level contact and collision sport, and revision surgery. Registry data from nearly 46,000 Scandinavian ACL reconstructions still show the lowest 5-year revision rate of any autograft with patellar tendon, 2.8% versus 4.2% for hamstring (Gifstad et al., AJSM 2014), and that registry-scale maturity is something I weigh heavily when a patient cannot afford a second reconstruction. I'm equally direct about the tradeoff: BPTB carries roughly three times the risk of severe kneeling difficulty compared with hamstring graft, even though overall constant knee pain is no different between the two (Rahardja et al., AJSM 2023). For a wrestler, a flooring installer, or anyone whose life involves a lot of kneeling, that's a real conversation, not a footnote.

The operation

The central third of the patellar tendon is harvested through an incision over the front of the knee, along with a bone plug from the patella and the tibial tubercle. The native ACL remnant is debrided arthroscopically, femoral and tibial tunnels are drilled, and the graft's bone plugs are secured in the tunnels, allowing bone-to-bone healing rather than the soft-tissue-to-bone healing required with tendon-only grafts. The knee is inspected for meniscal tears at the same time. In revision cases or knees with high-grade rotational laxity, a lateral extra-articular tenodesis may be added through a separate incision in the same setting.

Risks and honest tradeoffs

• Graft failure. In patients 25 and younger, pooled BPTB failure is 5.1% (95% CI 3.5–7.2%); at 5 or more years of follow-up across all ages, BPTB failure is 6.4%, the lowest of the three autografts at that follow-up length (Petit et al., AJSM 2026; Kurkowski et al., AJSM 2025).
• Kneeling difficulty is the signature tradeoff of this graft. Severe kneeling difficulty at 2 years occurred in 21.3% after BPTB versus 9.4% after hamstring, an adjusted odds ratio of 3.12 (Rahardja et al., AJSM 2023).
• Constant knee pain is not actually worse with BPTB. In the same registry, constant knee pain did not differ between grafts (9.9% BPTB vs 9.2% hamstring, P=.494) — the honest distinction is kneeling pain specifically, not knee pain in general (Rahardja et al., AJSM 2023).
• Anterior knee pain more broadly, pooled across the literature, ranges from 18.0% to 48.0%, and kneeling pain from 10.0% to 62.0% after BPTB harvest (Peebles et al., Arthrosc Sports Med Rehabil 2024).
• Osteoarthritis is not prevented by graft choice. About 36% of patients have radiographic osteoarthritis at roughly 10 years after ACL reconstruction, regardless of which graft was used (Webster & Hewett, Clin J Sport Med 2022).

Recovery and rehabilitation

Recovery follows the same criteria-based approach used across ACL grafts, with added early attention to patellofemoral symptoms given the harvest site's proximity to the kneecap. Early motion and weightbearing begin immediately, and open-chain quadriceps exercise is avoided for the first several weeks.

• Weeks 0–2: Early active motion and weightbearing; attention to patellofemoral swelling and full extension.
• Weeks 3–6: Progressive closed-chain quadriceps strengthening.
• Weeks 8–16: Return to running once pain, motion, and strength criteria are met (Rambaud et al., BJSM 2018).
• Months 6–9: Sport-specific agility work, formal strength and hop testing.
• Month 9 and beyond: Return to cutting, pivoting, and contact sport only after passing a strength and hop-test battery (Grindem et al., BJSM 2016).

1. Weeks 0–2

   Early active motion and weightbearing; attention to patellofemoral swelling and full extension.

2. Weeks 3–6

   Progressive closed-chain quadriceps strengthening.

3. Weeks 8–16

   Return to running once pain, motion, and strength criteria are met (Rambaud et al., BJSM 2018).

4. Months 6–9

   Sport-specific agility work, formal strength and hop testing.

5. Month 9 and beyond

   Return to cutting, pivoting, and contact sport only after passing a strength and hop-test battery (Grindem et al., BJSM 2016).

Alternatives I considered

For most patients under 30 who are not elite contact athletes or revision cases, I discuss quadriceps tendon as the alternative graft with a comparably low failure rate in younger patients and less kneeling morbidity; see the quadriceps tendon autograft page. For patients with a fresh, proximal tear who want to avoid graft harvest altogether, bridge-enhanced ACL restoration is discussed as a narrow-eligibility alternative on the ACL reconstruction hub.