Willert et al. examined periprosthetic tissues from 19 consecutive second-generation metal-on-metal hip revisions to determine whether immunological hypersensitivity could explain persistent pain, effusion, and osteolysis. Three control groups from non-metal-on-metal revisions were examined for comparison. The study defined the histological signature of ALVAL/LYDIA and tested whether bearing surface choice at revision determines symptom resolution.
A painful hip replacement with a cobalt-chromium articulation, joint effusion, and early osteolysis has a reflex diagnosis of loosening or infection — but this paper establishes a third possibility that changes management entirely.
When a metal-on-metal hip fails early (mean 33 months) with pain, effusion, or osteolysis and even radiographically stable components, ALVAL/metal hypersensitivity belongs on your differential. Exclude infection first (negative cultures, absence of neutrophils on histology), then proceed to revision.
The operative decision is binary: revise to a non-cobalt-chromium bearing. Alumina ceramic-on-polyethylene or metal-on-cross-linked polyethylene both achieved complete pain relief in every patient. A second metal-on-metal articulation failed every sensitized patient in this series.
This paper is the foundational evidence behind guidelines recommending against metal-on-metal revision in suspected ALVAL, and it established the histological vocabulary. ALVAL, LYDIA, drop-shaped inclusions, high endothelial venules. That pathologists and surgeons still use to communicate about these failures.
Willert et al. examined periprosthetic tissues from 19 consecutive second-generation metal-on-metal hip revisions to determine whether immunological hypersensitivity could explain persistent pain, effusion, and osteolysis. Three control groups from non-metal-on-metal revisions were examined for comparison. The study defined the histological signature of ALVAL/LYDIA and tested whether bearing surface choice at revision determines symptom resolution.
A painful hip replacement with a cobalt-chromium articulation, joint effusion, and early osteolysis has a reflex diagnosis of loosening or infection — but this paper establishes a third possibility that changes management entirely.
When a metal-on-metal hip fails early (mean 33 months) with pain, effusion, or osteolysis and even radiographically stable components, ALVAL/metal hypersensitivity belongs on your differential. Exclude infection first (negative cultures, absence of neutrophils on histology), then proceed to revision.
The operative decision is binary: revise to a non-cobalt-chromium bearing. Alumina ceramic-on-polyethylene or metal-on-cross-linked polyethylene both achieved complete pain relief in every patient. A second metal-on-metal articulation failed every sensitized patient in this series.
This paper is the foundational evidence behind guidelines recommending against metal-on-metal revision in suspected ALVAL, and it established the histological vocabulary. ALVAL, LYDIA, drop-shaped inclusions, high endothelial venules. That pathologists and surgeons still use to communicate about these failures.