From a product‑technology perspective, Knee Replacement Devices are classified into fixed‑bearing, mobile‑bearing, cemented, cementless, and hybrid systems, each shaping market dynamics. Fixed‑bearing implants, with an estimated 55 % share, use a stationary polyethylene insert that simplifies surgery and inventory, making them the default in high‑volume centers. Mobile‑bearing designs, about 25 % of sales, feature a rotating insert intended to reduce contact stress and extend wear life, attracting surgeons treating younger, active patients. Cemented fixation, covering roughly 45 % of the market, employs polymethylmethacrylate for immediate stability but demands precise bone preparation. Cementless fixation, growing at a CAGR above 7 % and now around 30 % of deployments, relies on porous coatings for osseointegration, aligning with trends toward minimally invasive procedures and longer survivorship. Hybrid configurations, combining cemented tibial and cementless femoral components, account for the remaining 5 % and are chosen when mixed fixation optimizes biomechanical outcomes. This “Knee Replacement Devices segmentation” by type reflects the interplay of surgical preference, patient demographics, and material‑science advances.