Quadriceps maximal isometric strength is decreased after anterior cruciate ligament reconstruction.
Adding local vibration training to rehabilitation improved strength recovery.
Local vibration to relaxed muscles could be implemented in the early period of anterior cruciate ligament rehabilitation.
After anterior cruciate ligament reconstruction (ACLR), quadriceps strength must be maximised as early as possible.
We tested whether local vibration training (LVT) during the early post-ACLR period (i.e., ∼10 weeks) could improve strength recovery.
This was a multicentric, open, parallel-group, randomised controlled trial. Thirty individuals attending ACLR were randomised by use of a dedicated Web application to 2 groups: vibration (standardised rehabilitation plus LVT, n=16) or control (standardised rehabilitation alone, n=14). Experimenters, physiotherapists and participants were not blinded. Both groups received 24 sessions of standardised rehabilitation over ∼10 weeks. In addition, the vibration group received 1 hour of vibration applied to the relaxed quadriceps of the injured leg at the end of each rehabilitation session. The primary outcome — maximal isometric strength of both injured and non-injured legs (i.e., allowing for limb asymmetry measurement) — was evaluated before ACLR (PRE) and after the 10-week rehabilitation (POST).
Seven participants were lost to follow-up, so data for 23 participants were used in the complete-case analysis. For the injured leg, the mean (SD) decrease in maximal strength from PRE to POST was significantly lower for the vibration than control group (n=11, −16%  vs. n=12, −30% ; P=0.0045, Cohen's d effect size=1.33). Mean PRE–POST change in limb symmetry was lower for the vibration than control group (−19%  vs. −29% ) but not significantly (P=0.051, Cohen's d effect size=0.85).
LVT improved strength recovery after ACLR. This feasibility study suggests that LVT applied to relaxed muscles is a promising modality of vibration therapy that could be implemented early in ACLR.
ClinicalTrials.gov: NCT02929004.Le texte complet de cet article est disponible en PDF.
Keywords : Local vibration, Strength, Rehabilitation, Anterior cruciate ligament reconstruction