[Femoral neck fractures in adults: joint sparing operations. II. The significance of surgical timing and implant for development of aseptic femur head necrosis].
Statistical analysis of the results of the AO multi-center study (Part I) shows significant advantages of early (within 24 h) operative stabilization of the medial neck fracture (P < 0.05) and of use of the dynamic hip screw (DHS) as implant (P < 0.01). Secondary surgery necessitated by implant complications led to higher rates of aseptic femoral head necrosis (FHN) and non-unions (NU) (P < 0.05). According to the so-called logistic regression, the rate of NU is influenced most by the number of implant complications and the choice of implant, the rate of FHN by the interval time-lapse between fracture and follow up, the implant selected (the best being the DHS), primary dislocation (poorest results obtained in Garden types III and IV) and the time-lapse between fracture and operative stabilization. This puts the assumed paramount importance of dislocation in perspective and calls in question the dogma that a dislocated intracapsular neck fracture will necessarily be followed by FHN.
Bonnaire
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F
Abteilung Unfallchirurgie, Albert-Ludwigs-Universität Freiburg.
Kuner
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EH
Lorz
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W
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001860:Bone Plates; D001863:Bone Screws; D005260:Female; D005265:Femoral Neck Fractures / Q000209:etiology / Q000601:surgery*; D005271:Femur Head Necrosis / Q000209:etiology*; D005500:Follow-Up Studies; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000209:etiology*; D013997:Time Factors