To stop arthritis from progressing, you need to avoid running, squatting, jumping, stairs, cross legged sitting. Do weight reduction and quadriceps and hamstring strengthening exercises.

Knee crepitus can be from multiple causes. Painless crepitus can be ignored. So, I won't advice for crepitus knee treatment as such.. Crepitus from knee cap problems can be cured with hip and knee strengthening. Crepitus from cartilage irregularities or loose pieces often need minor keyhole surgery. Painful crepitus from arthritis is initially treated with physical therapy and surgery when therapy stops helping. 

Your problem might be a torn meniscus, which is a cushion inside the knee. It can tear from twisting, bending, or wear and tear. Symptoms include pain, swelling, popping sounds, and the knee locking. You can treat it with rest, ice packs, keeping your leg raised, and doing physical therapy exercises. Surgery may be needed for severe tears.

The movements which cause dislocation after hip replacement are:

a. Bending and leaning forward 
b. Sitting on low chairs, low bed, low toilets.
c. Crossing the knees
d. Lifting knee higher than your hip.

Causes of the lower back pain at right side that occurs after one sits for more than thirty minutes include a number of factors which can range from poor posture or muscle strain to herniated discs. However, it is best to visit an orthopedic specialist

You suffer from back and leg pain as well as numbness and excess sleepiness. These symptoms can be caused by a nerve block in your lower back which can produce discomfort and strange sensations in your leg. Your doctor has prescribed some medicines to you to aid in managing pain and inflammation. Adhere to them, and take a break from your doctor if there are any changes or concerns.