Hip arthritis results from the breakdown of cartilage within your hip joints, causing hip stiffness and pain that can increase with inactivity, standing, and walking. Although walking can be uncomfortable and difficult with hip arthritis, walking is also incredibly important for maintaining the mobility and strength of your hips.
Source: Verywell Health
Chondromalacia patella, also known as runner's knee, is a knee condition that can cause pain and grinding when the knee is flexed. It's due to the breakdown in the cartilage on the undersurface of the kneecap (patella) that causes bones to rub against each other. Overuse (especially from running or cycling), trauma, such as a fracture, or a misalignment of the kneecap and femur can all cause chondromalacia.
Source: Verywell Health
You worked up a sweat playing basketball, and now your knees are screaming in pain. Or maybe your knees are in agony just from sitting all day in front of your computer. If one or both of your knees ache after too much sitting, running, jumping or squatting, you may have patellofemoral pain (PFPS).
Source: healthessentials
Water on the knee is when fluid collects around and inside the knee joint, causing pain and swelling. Also known as knee effusion or fluid on the knee, it can occur whenever there's damage to the joint due to injury or underlying disease, such as arthritis.
Source: Verywell Health
Hip dysplasia is a condition that occurs when the hip socket (acetabulum) is too shallow to fully support the ball of the hip joint, called the femoral head. This typically affects a developing fetus, a condition called congenital hip dysplasia or developmental dysplasia of the hip (DDH). However, symptoms can appear during adolescence or even in adulthood.
Source: Verywell Health
