Archives of orthopaedic and traumatic surgery

, Volume 105, Issue 6, pp 339–342 | Cite as

Loosening 5 years after total hip replacement —A radiological study of the McKee-Farrar and Charnley prostheses

  • K. Djerf
  • O. Wahlström
  • S. Hammerby
Original Articles

Summary

In a prospective study, 138 patients who underwent total hip replacement by the McKee-Farrar or the Charnley technique were monitored yearly for 5 years by X-ray. Six variables were measured on anteroposterior and lateral projections to describe the position of the prosthesis. Lateral opening > 50° and cover of the acetabular cup < 1.5 cm correlated with an increased cup-loosening rate: 71% (98 of 138) were loose at the 5-year follow-up. However, only about one-third of all cup loosenings in the present series can be explained by nonoptimal position of the prosthesis. No significant difference emerged concerning loosening rate between the McKee-Farrar and the Charnley prostheses.

Keywords

Public Health Present Series Radiological Study Lateral Projection Lateral Opening 

Zusammenfassung

In einer prospektiven Studie wurden an 138 Patienten mit einer Totalhüftendoprothese der Typen McKee-Farrar oder Charnley während eines Zeitraumes von 5 Jahren jährlich Röntgenkontrollen durchgeführt. Um die genaue Position der Prothese zu beschreiben, wurden 6 verschiedene Aufnahmen in anteroposteriorer und lateraler Projektion durchgeführt. Ein lateraler Öffnungswinkel von über 50° und eine unzureichende seitliche Überdachung der künstlichen Gelenkpfanne korrelierten mit zunehmender Lockerungsrate. 71% (98 von 138) lockerten sich innerhalb der ersten 5 Jahre. Trotzdem kann nur ungefähr ein Drittel aller Pfannenlockerungen in dieser Serie durch eine nicht optimale Position der Prothese erklärt werden. Bezüglich der Lockerungsrate bestand kein signifikanter Unterschied zwischen beiden Prothesentypen.

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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • K. Djerf
    • 1
  • O. Wahlström
    • 1
  • S. Hammerby
    • 1
  1. 1.Departments of Orthopaedic Surgery and Diagnostic RadiologyUniversity HospitalLinköpingSweden

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