It has to be a mattress that will align the shoulder and hip to keep them straight so the shoulder and the hip will not be injured. It should also help people who have had shoulder and hip surgeries. It would be ideal if it helped these people to recover from theses types of surgeries. You will probably spend a good amount for one of these mattresses but it is worth the security knowing you will be able to sleep in comfort with hip and shoulder pain. The mattress must be firm and be able to alleviate the pressure points in the hip and shoulder areas. This will cause the pressure to be taken off the hip and shoulder joints and you will be able to sleep pain free and you will wake up in the morning free of pain . You will feel refreshed and ready to go in the morning.