gms | German Medical Science

German Congress of Orthopedic and Trauma Surgery (DKOU 2018)

23.10. - 26.10.2018, Berlin

Article

Send article

Increased rate of cam deformity in early stage nontraumatic osteonecrosis of the femoral head

Meeting Abstract

Search Medline for

  • presenting/speaker Liang Gao - Center of Experimental Orthopaedics, Saarland University, Homburg, Germany
  • Ao Xiong - Department of Orthopaedics, Peking University ShenZhen Hosipital, Shenzhen, China
  • Jianjin Lin - Department of Orthopaedics, Peking University ShenZhen Hosipital, Shenzhen, China
  • Rong Huang - Department of Radiology, Peking University ShenZhen Hosipital, Shenzhen, China
  • Hui Zeng - Department of Orthopaedics, Peking University ShenZhen Hosipital, Shenzhen, China

Deutscher Kongress für Orthopädie und Unfallchirurgie (DKOU 2018). Berlin, 23.-26.10.2018. Düsseldorf: German Medical Science GMS Publishing House; 2018. DocPT16-1469

doi: 10.3205/18dkou648, urn:nbn:de:0183-18dkou6482

Published: November 6, 2018

© 2018 Gao et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. See license information at http://creativecommons.org/licenses/by/4.0/.

Outline

Text

Objectives: To investigate the correlation between the early stage idiopathic osteonecrosis of the femoral head (ONFH) and the cam femoroacetabular impingement (FAI).

Methods: One hundred and thirty-four hips from one hundred and twenty-two idiopathic ONFH patients were matched by age and gender with one hundred and thirty-four hips from one hundred and thirty healthy subjects. The alpha angle the hips were measured independently in both anteroposterior and frog-leg lateral radiographs. Stage- and gender-stratified analysis of the average alpha angle and the prevalence of the cam FAI (alpha angle >50°) was performed.

Results and conclusion: Compared with matched controls, a significantly more cam deformity was identified in the anteroposterior radiograph of Ficat stage III ONFH patients and in the lateral radiograph of Ficat stage II and III patients (P<0.001) (Figure 1). Of note, the Ficat stage III patients obtained a remarkable increase of the average alpha angle compared with the Ficat stage I and II ONFH patients (P<0.001). Such increase of the average alpha angle was independent of gender of patients when compared with matched controls (P<0.001).

In conclusions, these data indicate an increased rate of cam FAI occurring in early stage nontraumatic osteonecrosis of the femoral head.