The inner CV joint is a crucial part of a cars driving function and is responsible for transferring torque from the transmission to the wheels at a constant speed. Failure of a CV joint can result in severe problems for your vehicle and should be repaired as soon as possible.
The failure of a inner CV joint is most likely due to dirt and water getting in to the joint from a broken or split CV boot. Passenger CV joint damage is less common than driverside joint damage due to the extra heat that is emitted on that side of the vehicle. This heat can dry and crack the rubberised CV boot and also thin down the lubricant which is inside the joint protecting the inner CV joint causing evaporation and leakage. This means that the sensitive parts of the CV joint will rub against each other, causing wear and tear.
More often than not, the damage to a inner CV joint is demonstrated by a vibration when accelerating or carrying load. Damage can also cause shuddering of the vehicle and side-to-side vehicular movement.