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J Arthroplasty. 2014 Dec;29(12):2415-9. doi: 10.1016/j.arth.2014.02.010. Epub 2014 Feb 12.

Standing versus supine radiographs to evaluate femoral head penetration in the polyethylene liner after total hip arthroplasty.

Author information

1
Department of Orthopedic Surgery, Shinonoi General Hospital, Shinonoi, Nagano 388-8004, Japan.
2
Department of Orthopedic Surgery, Shinshu University School of Medicine, Matsumoto, Nagano 390-8621, Japan.
3
Department of Orthopedic Surgery, Chushin Matsumoto Hospital, Matsumoto Medical Center, Matsumoto, Nagano 399-0021, Japan.
4
Department of Orthopedic Surgery, IMS Miyoshi General Hospital, Miyoshi-cho, Iruma-gun Saitama 354-0041, Japan.

Abstract

The linear penetration rates for ceramic femoral heads on conventional and highly cross-linked polyethylene were measured and compared with radiographs taken in the standing and supine position taken three weeks postoperatively and at final follow-up. Seventy-five patients (83 hips) with conventional polyethylene (group-1) and two hundred and seventy five patients (300 hips) with highly cross-linked polyethylene (group-2) were studied. Follow-up periods were 14.5years in group-1 and 8.6years in group-2. The average penetration rates in group-1 were 0.17mm/year in supine position and 0.18mm/year in standing position (P<0.05). On the other hand, the rates in group-2 were 0.03mm/year and 0.04mm/year respectively (P<0.05). Although there were statistical differences between groups, 0.01mm differences are probably not clinically relevant.

KEYWORDS:

femoral head penetration; polyethylene liner wear; standing radiograph; total hip arthroplasty

PMID:
24742717
DOI:
10.1016/j.arth.2014.02.010
[Indexed for MEDLINE]
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