The hip-arthroplasty community currently feels that the advantages gained from head-neck modularity outweigh the risks, but JBJS Case Connector raises that risk-benefit question in an August 26, 2015 “Watch” article. Modular head-neck failures of total-hip prostheses are indeed rare complications, but the potentially catastrophic consequences and a seemingly increased incidence are raising concern among orthopaedists.

Prompted by a case report by Swann et al. in the August 26, 2015 JBJS Case Connector and a report by Arvinte et al. in the April 22, 2015 JBJSCase Connector, the Watch describes three patients who experienced a complete head-neck dissociation seven to fourteen years after primary arthroplasty with modular components.

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