OTT Technique Guides

https://pubmed.ncbi.nlm.nih.gov/9604189/

• 👥 Patient population: 40 sports-active patients, minimum 2-year follow-up (mean 36 months). 33 men/7 women; age 18–40 (mean 25). 16 acute cases; 24 chronic (injury-to-surgery 2–121 months, mean 22.5)
• ✅ 92.5% normal or nearly normal knees (IKDC A/B); mean Lysholm 95
• 📏 Instrumented stability: KT-2000 mean side-to-side difference 2.1 mm (range 0–8); 93.3% within 0–5 mm
• ⚽ Return to sport: 100% resumed sport; 90% at the same level. Timing: 67.5% at 3–4 months, 27.5% at 4–6 months
• 🦵 Low morbidity: full ROM in 95%; anterior knee pain 5%; no patellofemoral crepitus reported
• 🚀 Accelerated rehab didn’t compromise stability: earlier return (3–4 months) was not associated with worse IKDC/stability

https://pmc.ncbi.nlm.nih.gov/articles/PMC9520075/

• 👥 Patient context: Technical note describing single-stage revision ACL reconstruction using Achilles tendon allograft with bone block, combined with lateral extra-articular tenodesis (LET) — designed for failed primary ACL with rotatory instability and tunnel malposition/widening
• 🔧 Key surgical advantage: OTT technique eliminates need for a new femoral tunnel, bypassing tunnel overlap, widening, or hardware issues — useful in complex revision cases
• 🔁 Addresses rotatory instability: LET incorporated through the same graft, fixed just medial to Gerdy’s tubercle, enhancing pivot-shift control in high-risk revision patients
• 🦴 Versatile graft option: Achilles allograft with calcaneal bone block allows tibial fixation with interference screw and femoral fixation with staples; suitable when autograft options are limited
• 📊 Reported literature outcomes (revision OTT): ~52% return to preinjury sport level; ~8.4% failure rate; functional outcomes comparable to anatomic revision techniques
• 💰 Cost-efficient construct: Requires only three staples plus tibial interference screw; avoids staged bone grafting and prolonged two-stage recovery

https://www.sciencedirect.com/science/article/pii/S2212628725004256

• 👥 Indication:

Revision ACL cases with femoral tunnel malposition or enlargement, and tibial tunnels ≥8 mm — where traditional tunnel-based revision may require 2-stage surgery.

• 🔧 Key Innovation:

Classic OTT (hamstrings with preserved tibial insertion) is augmented with peroneus longus allograft, increasing graft diameter from 5.5–7 mm to >8 mm, making it suitable for revision settings.

• 🦴 Single-Stage Solution:

Avoids femoral tunnel drilling entirely → enables correction of femoral tunnel malposition without staged bone grafting.

• 🔄 Biomechanical Rationale:
• Larger graft diameter (>8 mm) improves strength and lowers failure risk
• Preserving tibial insertion may enhance biological integration
• Built-in LET improves rotational stability
• 💰 Practical Advantages:

Cost-effective staple fixation

Reduced morbidity vs 2-stage revision

Addresses intra- and extra-articular instability simultaneously

• ⚠️ Limitations:**

Extra lateral incision

Hardware-related symptoms possible

Allograft required if prior hamstrings used

Core Message

In complex revision ACL cases, augmented OTT provides a tunnel-free, >8 mm graft, single-stage solution — eliminating femoral malposition while restoring rotational stability.

https://pmc.ncbi.nlm.nih.gov/articles/PMC12322690/

• 👥 Population: 75 skeletally immature patients (mean age 13.9 ± 2.2 years) with acute ACL rupture.
• 🧮 6 Weighted Criteria (Score 0–10):

MRI factors

1. Bucket-handle or radial tear (3 pts)
2. Ramp/longitudinal tear (2 pts)
3. Lateral bone bruise pattern (1 pt)

Patient factors

4. Skeletal age ≥13 (boys) / ≥11 (girls) (2 pts)
5. Non-contact injury during preferred sport (1 pt)
6. Grade 3 pivot shift (1 pt)
• ⚖️ Interpretation:
• 0–2 points → Conservative treatment
• ≥3 points → Surgical treatment
• 📈 Predictive Performance:
• Positive predictive value (surgery needed) = 91.7%
• Negative predictive value (conservative success) = 87.5%
• 🎯 Purpose:

Provides a structured, MRI-based framework to predict failure of conservative care and guide early surgical decision-making in skeletally immature ACL injuries.

In short:

It predicts who will fail nonoperative treatment before instability causes secondary damage

https://pmc.ncbi.nlm.nih.gov/articles/PMC12459316/

• 👥 Indication: ACL injuries in skeletally immature patients; treatment tailored based on MRI bone age assessment, not chronological age.
• 📊 Three-stage OTT strategy based on skeletal maturity:

1️⃣ Prepubescents → Extra-physeal (no tunnels, no hardware)

2️⃣ Young adolescents → Supra-physeal (epiphyseal tibial tunnel, fixation above physes)

3️⃣ Older adolescents → Trans-physeal (adult-style technique)

• 🦴 Femoral fixation without tunnel in all stages (true OTT route), minimizing risk to distal femoral physis.
• 🔄 Single continuous graft + lateral tenodesis improves rotational control while preserving hamstring tibial insertion, potentially enhancing graft maturation.
• 📈 Clinical outcomes:

High return-to-sport rates, low growth disturbance rates, and durable long-term adult data supporting safety of the OTT construct.

Extraphyseal Technique

Supraphyseal Technique

Transphyseal Technique

https://pmc.ncbi.nlm.nih.gov/articles/PMC12620561/

• 👥 Patient population

Paediatric and skeletally immature athletes with ACL injuries, typically ages 12–14, where open physes make surgical management more complex.

• 📈 Incidence is increasing

ACL injuries in children are rising due to increased sport participation, with ~2.3% annual increase reported in the United States.

• ⚠️ Non-operative treatment carries risks

Conservative management may lead to secondary meniscal injury rates as high as 60–70%, potentially accelerating long-term joint degeneration.

• 🧠 Treatment must consider skeletal age, not chronological age

MRI-based skeletal maturity assessment (STEP method) helps guide technique selection and determine remaining growth and physeal risk.

• 🧭 BABY-Knee algorithm guides decision-making

A 10-point scoring system incorporating bone age, meniscal injury, bone bruising, laxity, and trauma mechanism helps determine conservative vs surgical treatment.

• 🔧 Technique selection depends on growth remaining

Surgical options include:

1. Extraphyseal (Over-the-Top) – preferred in prepubescent children
2. All-epiphyseal – tunnels within epiphysis
3. Partial transphyseal – hybrid approach
4. Transphyseal – used near skeletal maturity.

https://www.aaos.org/videos/video-detail-page/?id=17134__Videos

https://pmc.ncbi.nlm.nih.gov/articles/PMC12420572/

• 👦 Indication: Prepubescent skeletally immature patients with ≥5 years of growth remaining (bone age: boys <12, girls <10), open physes on MRI.
• 🦴 No tunnels. No hardware.

Hamstrings (gracilis + semitendinosus) left attached distally, passed over-the-top and fixed to periosteum — completely extraphyseal, avoiding femoral and tibial drilling.

• 🔄 Combined intra- + extra-articular construct

Single graft restores AP and rotational stability, incorporating a lateral extra-articular tenodesis (LET).

• 📉 Designed to minimize physeal risk

Graft passed under the intermeniscal ligament (not through a tibial tunnel) to protect the proximal tibial physis.

• 📚 Built on 25-year adult OTT data

Adult OTT + LET series show durable long-term results, supporting its adaptation to the pediatric extraphyseal setting.

https://pmc.ncbi.nlm.nih.gov/articles/PMC12712505/

• 👥 Indication:

Skeletally immature patients (Tanner stage 2–3) with 5–7 years of growth remaining, where preserving the femoral physis is critical.

• 🔧 Hybrid surgical concept:

Combines three principles in one construct:

1. Transphyseal tibial ACL tunnel
2. Over-the-top femoral fixation (physeal-sparing)
3. All-epiphyseal tibial fixation for ALL reconstruction
• 🦴 Single hamstring graft with preserved tibial insertion

Semitendinosus and gracilis are harvested while maintaining their tibial attachment, then routed through the tibial tunnel and over the lateral femoral condyle.

• 🔄 Built-in rotational control:

The remaining graft portion reconstructs the anterolateral ligament (ALL) and is fixed epiphyseally on the tibia, providing additional rotational stability.

• ⚠️ Rationale for OTT femoral fixation:

Femoral physeal injury carries greater risk of growth disturbance and angular deformity, making physeal-sparing approaches preferable in children.

• 📉 Failure reduction strategy:

Pediatric ACL reconstruction has failure rates up to 23% (or 32% including contralateral injury); adding anterolateral augmentation may improve stability and reduce graft rupture risk.

Key Insight

Using over-the-top femoral fixation allows ACL reconstruction in children while protecting the femoral growth plate, making it a valuable option for skeletally immature athletes.

https://pmc.ncbi.nlm.nih.gov/articles/PMC9705769/

Single-Stage Strategy for Multiple Failures

• 👥 Paper type: Technical Note describing single-stage revision ACL reconstruction combined with slope-reducing high tibial osteotomy (HTO) in patients with multiple graft failures and posterior tibial slope (PTS) >12° (Arthrosc Tech 2022, Zsidai et al.)
• 📐 Why slope matters:

PTS ≥12° strongly associated with recurrent graft failure; slope reduction decreases anterior tibial translation and ACL graft forces (Arthrosc Tech 2022, Zsidai et al.)

• 🔧 Key surgical concept:

Combine anterior closing-wedge HTO (target PTS 7–10°) with OTT Achilles allograft ACL reconstruction in a single stage (Arthrosc Tech 2022, Zsidai et al.)

• 🔁 Revision advantage of OTT:

Bypasses widened or malpositioned femoral tunnels, avoids new femoral tunnel drilling, and simplifies complex revision scenarios (Arthrosc Tech 2022, Zsidai et al.)

• 🎯 Core principle:

Address both biologic and biomechanical failure drivers —correct the slope, eliminate tunnel error, restore stability (Arthrosc Tech 2022, Zsidai et al.)