By Dr. Jeffrey Peng, MD · Published March 4, 2026 · 6 min read Watch the Full Video Knee osteoarthritis is one of the most common conditions I treat in my sports medicine practice . It is characterized by the progressive deterioration and loss of cartilage inside the knee joint. While many patients assume that arthritis means the end of an active lifestyle, understanding the warning signs early can help you take the right steps to manage symptoms and preserve joint function.

Shoulder clicking is usually harmless. Here’s when it can signal a real problem — and what the research shows about rotator cuff tears and arthritis.