Effect of Low-Intensity Pulsed Ultrasound on Joint Injury and Post-Traumatic Osteoarthritis: an Animal Study.

Abstract

This study investigated the therapeutic potential of low-intensity pulsed ultrasound (LIPUS) in post-traumatic osteoarthritis (PTOA). Intra-articular fracture of the medial tibial plateau was surgically created in 30 rats. LIPUS was applied to the operated joints either for the first 2&#x2009;wk (LIPUSgroup) or in weeks 4 and 5 after intra-articular fracture (LIPUSgroup). In controls, the operated knees were not treated with LIPUS (LIPUSgroup). The rats were monitored with weekly gait analysis and euthanized at week 8. Among the altered gait parameters, the maximal and average paw print areas in the LIPUSand LIPUSgroups, but not the LIPUSgroup, had either reached baseline or significantly recovered (70%, p&#x2009;<0.05) by week 8. PTOA pathology in both the LIPUSand LIPUSgroups was less severe than that in the LIPUSgroup (Mankin score: 5.4 and 4.5 vs. 8.8, p&#x2009;<0.05). In conclusion, LIPUS treatment partially improved the gait of the affected limbs and reduced cartilage degeneration in PTOA.