Side effects and patient tolerance with the use of blood flow restriction training after ACL reconstruction in adolescents: a pilot study

Key points

1. 0129 adolescents performed blood flow restriction training at 80% limb occlusion after ACL reconstruction, with 535 total sessions analyzed.
2. 02No major side effects occurred: subcutaneous hemorrhage, deep vein thrombosis, and fainting were each reported in 0% of sessions.
3. 03The most common minor effect was itching, reported in 7.59% of sessions.
4. 04Patients were unable to finish the exercise in 10.47% of sessions, the most frequent tolerance issue.
5. 05This is an uncontrolled pilot study with no comparison group, so it describes safety and tolerability rather than proving the training is effective.

How it was conducted

Design

Single-arm pilot study (no control group)

Participants

29 adolescents after ACL reconstruction, mean age 15.39 years

Intervention

Blood flow restriction training at 80% limb occlusion over a 6-phase, 12-week protocol

Timing

Started a mean of 8.72 days post-op; mean 18.45 BFR sessions per patient

Outcomes

Major and minor side effects and patient tolerance, reported per total treatments (535 sessions)

What they found

• No major side effects across 535 treatments: subcutaneous hemorrhage 0%, deep vein thrombosis 0%, fainting 0%.
• Minor side effects per 535 treatments: itching 7.59%, lower extremity paresthesias 2.81%, dizziness 0.75%.
• Patient tolerance issues per 535 treatments: inability to finish 10.47%, decrease in cuff pressure 3.55%.
• Patients averaged 18.45 (SD 6.47) BFR sessions each and began a mean of 8.72 (SD 3.32) days after surgery.
• Baseline Tegner activity score was 8.43 (SD 1.89); mean BMI was 23.65 (SD 3.90) kg per square meter.

Limitations

• Single-arm pilot with no control group, so safety cannot be compared against standard rehabilitation.
• Small sample of only 29 adolescents from one setting, limiting how broadly results apply.
• Outcomes are self-reported side effects and tolerance counts, with no objective measures such as imaging to confirm absence of clots.
• No functional or recovery outcomes were measured, so the summary speaks only to safety and comfort, not benefit.

Why it matters

For patients

If you are a teenager recovering from ACL surgery, blood flow restriction training appears safe with no serious complications, though some sessions may feel uncomfortable or be hard to finish.

For clinicians

Early blood flow restriction training at 80% occlusion was tolerated in adolescents post-ACL reconstruction with no major adverse events, supporting its feasibility while flagging a roughly 10% per-session intolerance rate.

For readers

This pilot documents the safety and tolerability profile of blood flow restriction training in young ACL patients but does not test whether it improves recovery.