Effect of Overdose Ultrasound on Osteoarthritic Knee in Adult Albino Rat: a Histological Study

Group II: (Normal-US Group): The rats will receive 2 sessions/ day of underwater pulsed US waves with 1 MHZ frequency and 1 watt/cm2 power, for 10 min for 30 consequent days applied to the right knee. The rats will be sacrificed after 30 days. Group V: (Osteoarthritis-US group) after two weeks of chemical induction of osteoarthritis, the rats will receive 2 sessions/ day of underwater pulsed US waves with 1 MHZ frequency and 1 watt/cm2 power for 10 min for 30 consequent days applied to the right knee. The rats will be sacrificed after 44 days.

"Group III: (Osteoarthritis-induced group): For studying the histological changes of the articular knee joint after osteoarthritis induction in the right knee joint before recovery occur. The patellar ligament will be palpated below the patella and a single intra-articular injection of (MIA lateral to the ligament using an insulin syringe will be performed).~The rats will be injected once with monosodium iodoacetate (MIA) dissolved in sterile saline (6 mg/kg body weight, 50 μL). Saline acts as a vehicle for MIA. The rats will be sacrificed after 14 days of MIA injection (1st day of the experiment).~Group IV: (Osteoarthritis-Recovery group): The rats will be injected once with monosodium iodoacetate (MIA) dissolved in sterile saline (6 mg/kg body weight, 50 μL), Saline acts as a vehicle for MIA and will not receive any medication. The rats will be sacrificed after 44 days of MIA injection (1st day of the experiment)."

Group I:Sham Comparator (Control group): for studying the normal histological structure of the articular knee joint.