Harris synthesizes long-term THA series to argue that periprosthetic osteolysis has replaced mechanical loosening as the central unsolved problem in hip arthroplasty. The paper examines femoral and acetabular fixation data, the biological mechanism of cemented cup failure, and osteolysis rates across cementless series. The central thesis: femoral fixation is largely solved — osteolysis is what kills the hip replacement.
Through the 1980s, THA research focused on achieving durable fixation. Harris showed in 1995 that fixation had been solved — and that the real threat was biologic bone destruction driven by wear particles, hiding in plain sight as 'loosening.'
When you see progressive radiolucency behind a cemented cup, do not call it simply loose. Recognize it as osteolysis: macrophage-driven bone resorption that will continue as long as the bearing generates debris.
This paper is why modern THA prioritizes wear reduction. Highly cross-linked polyethylene, ceramic bearings, and improved liner locking mechanisms all trace their clinical rationale directly to this framework.
The 5-year follow-up rule Harris establishes here remains the field-wide standard: any implant or material showing promising 2-year data must be treated as unproven until osteolysis data mature.
Harris synthesizes long-term THA series to argue that periprosthetic osteolysis has replaced mechanical loosening as the central unsolved problem in hip arthroplasty. The paper examines femoral and acetabular fixation data, the biological mechanism of cemented cup failure, and osteolysis rates across cementless series. The central thesis: femoral fixation is largely solved — osteolysis is what kills the hip replacement.
Through the 1980s, THA research focused on achieving durable fixation. Harris showed in 1995 that fixation had been solved — and that the real threat was biologic bone destruction driven by wear particles, hiding in plain sight as 'loosening.'
When you see progressive radiolucency behind a cemented cup, do not call it simply loose. Recognize it as osteolysis: macrophage-driven bone resorption that will continue as long as the bearing generates debris.
This paper is why modern THA prioritizes wear reduction. Highly cross-linked polyethylene, ceramic bearings, and improved liner locking mechanisms all trace their clinical rationale directly to this framework.
The 5-year follow-up rule Harris establishes here remains the field-wide standard: any implant or material showing promising 2-year data must be treated as unproven until osteolysis data mature.