The effectiveness and safety of blood flow restriction training for post-operative rehabilitation

Key points

1. 01BFR group had significantly less pain than regular training at weeks 2 and 4 (VAS: 0.65 vs 2.50 at week 2; 0.06 vs 1.28 at week 4; p < 0.01)
2. 02Wrist extension and flexion strength were significantly higher in the BFR group at both weeks 2 and 4 (all p < 0.001)
3. 03Wrist function score at 12 weeks was substantially better in the BFR group (87.35 vs 73.61; effect size 0.68; p < 0.01)
4. 04BFR did not raise D-dimer levels or affect bone healing scores (RUSS), indicating it is safe in this early post-operative setting
5. 05Passive range of motion was not significantly different between groups, suggesting BFR may benefit active but not passive ROM

How it was conducted

Design

Prospective randomized controlled trial

Participants

35 adults (17 BFR, 18 regular training) post-ORIF for distal radius fracture, recruited 3-7 days after surgery; mean age 46 years (range 23-72)

Intervention

BFR therapy at 120 mmHg on the upper arm, 5 sessions per week for 4 weeks, added to the same rehabilitation program both groups received

Comparator

Regular training (same rehabilitation program without BFR)

Primary outcome

Wrist extension and flexion isometric strength (ratio of operated to healthy side) at 4 weeks

Follow-up

12 weeks (wrist function and bone healing assessed at week 12)

What they found

• Pain (VAS): BFR group week 2 mean 0.65 +/- 0.79 vs RT group 2.50 +/- 0.62 (p < 0.01, effect size 2.33); BFR week 4 mean 0.06 +/- 0.24 vs RT 1.28 +/- 0.67 (p < 0.01, effect size -2.44)
• Wrist extension strength (proportion of healthy side): BFR week 2 mean 0.49 +/- 0.11 vs RT 0.34 +/- 0.09 (p < 0.01, effect size 0.40); BFR week 4 mean 0.72 +/- 0.08 vs RT 0.52 +/- 0.05 (p < 0.01, effect size 0.67)
• Wrist flexion strength: BFR week 2 mean 0.50 +/- 0.10 vs RT 0.38 +/- 0.08 (p < 0.01, effect size 0.32); BFR week 4 mean 0.70 +/- 0.06 vs RT 0.52 +/- 0.08 (p < 0.01, effect size 0.64)
• Wrist circumference change score at week 4: BFR 0.40 +/- 0.44 cm vs RT 1.51 +/- 0.57 cm (p < 0.01); forearm circumference change did not differ significantly
• Wrist function at 12 weeks (Cooney modification): BFR 87.35 +/- 4.00 vs RT 73.61 +/- 5.64 (p < 0.01, effect size 0.68)
• Passive ROM: no significant differences between groups at weeks 0, 2, or 4 for any wrist motion direction
• D-dimer levels and RUSS bone healing scores: no significant differences between groups throughout the study

Limitations

• BFR pressure was set at a fixed 120 mmHg for all patients rather than individualized based on each patient's limb occlusion pressure, so responses may have varied
• Small sample size (n = 35 after dropouts) and short 4-week intervention limit generalizability and the ability to detect longer-term effects
• No muscle hypertrophy was directly confirmed by forearm circumference measurements, possibly because the trial was too brief or training load too low
• Strength and circumference data were normalized to the unoperated arm, and subtle between-arm differences were ignored, which may introduce processing bias

Why it matters

For patients

People recovering from wrist fracture surgery may benefit from adding blood flow restriction to their rehab program, achieving less pain and better wrist strength faster, without extra risk of clots or delayed healing.

For clinicians

BFR at 120 mmHg applied 5 times per week over 4 weeks is a safe adjunct to standard post-ORIF rehabilitation for distal radius fracture, producing large effect-size gains in wrist strength and function without raising coagulation markers or disrupting bone healing.

For readers

This single-centre RCT provides moderate-quality evidence that BFR augments post-operative rehabilitation outcomes for wrist fracture, though individualized pressure protocols and longer follow-up studies are still needed.