Application segmentation partitions the market into four procedural categories: total hip replacement (THR), partial hip replacement (PHR), total knee replacement (TKR), and partial knee replacement (PKR). THR remains the largest application, driven by an aging population and rising prevalence of osteoarthritis, accounting for roughly 35 % of system sales. PHR, focused on femoral head resurfacing, captures a niche 10 % share, reflecting its selective use in younger patients with localized joint damage. TKR commands the most substantial portion—approximately 45 %—as knee arthroplasty volumes outpace hip procedures due to higher incidence of degenerative knee disease and broader insurance coverage. PKR, targeting isolated compartmental degeneration, holds the remaining 10 % share, supported by demand for bone‑preserving, faster‑recovery options. These application segments dictate implant design specifications, surgical workflow, and post‑operative care protocols, directly influencing market allocation and forecasting within the Primary Hip and Knee Replacement System market taxonomy.