The shoulder relies on a delicate interplay between four rotator cuff muscles, multiple ligaments, and a thin layer of articular cartilage to maintain stability through its 180-degree range of motion. Over time, repetitive overhead motions, poor posture, or acute injury can cause microtrauma that accumulates faster than the body can repair -- studies show rotator cuff degeneration affects up to 30% of adults over age 60.
As tendons fray or become impinged beneath the acromion, inflammation triggers a cascade of pain signals. Swollen bursa compress surrounding nerves, further amplifying discomfort and restricting motion. Without intervention, this inflammatory cycle becomes self-perpetuating, converting acute injury into chronic pain.
Cartilage degradation compounds the problem by reducing the cushion between bones. When the humeral head grinds against the glenoid without adequate cartilage buffer, osteoarthritis develops, producing the deep, aching pain and morning stiffness that many patients describe as gradually worsening over months or years.
