Poor results of the Ribbed Hip System for cementless replacement

Sweetnam, D. I. S.; Lavelle, Jonathon; Allwood, W. M.; Cohen, Brian S.

doi:10.1302/0301-620x.77b3.7744916

Cited by 12 publications

(7 citation statements)

References 0 publications

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“…This has been shown to be the case with other prostheses. [6][7][8] We support the view that constant clinical review must be recommended for all implants. Such vigilance will prevent the continued use of suboptimal devices.…”

Section: Discussionsupporting

confidence: 58%

Poor results of the Freeman uncemented metal-backed acetabular component

Journeaux

Morgan

Donnelly

2000

The Journal of Bone and Joint Surgery. British volume

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The Freeman metal-backed acetabular component is specifically designed for use with a Freeman-neck-retaining stem.1 Among its several unique features are an arc of 140°; subtended in relation to the prosthetic femoral head and a titanium metal back with a superolateral flange through which a screw can be inserted to supplement uncemented press-fit fixation. Into this metal back is inserted a high-density polyethylene (HDP) liner which has a central peg and two superolateral lugs that lock into the metal back (Fig. 1). Over a period of five years 120 cups were inserted by the senior author (DAFM) using three configurations of the femoral stem, all of which had fixed heads of 32 mm in diameter. We report the results using this acetabular component and describe a typical pattern of failure. Patients and MethodsBetween January 1987 and February 1991, 120 primary hip arthroplasties were carried out on 109 patients using a Freeman metal-backed acetabular cup (Corin Medical, Cirencester, UK) and a Freeman neck-retaining femoral prosthesis (Corin Medical). The femoral stem was used in one of three configurations; a cemented smooth stem in 71, an uncemented smooth stem in nine and an uncemented ridged stem in 40. There were 51 men and 58 women with a mean age at operation of 58.9 years for the men (30 to 85) and 64.8 years for the women (22 to 87). Of the 109 patients, operation was carried out for osteoarthritis in 86%, inflammatory arthritis in 10%, trauma in 2%, and for other causes in 2%. A Hardinge approach was used for all the patients. 2Those femoral prostheses which were cemented were implanted using a second-generation technique with lowviscosity polymethylmethacrylate containing gentamicin. The minimum follow-up was for 62 months. A total of 26 patients had died. Of the four perioperative deaths, three were due to cardiovascular causes and one to a perforated viscus. Four patients were lost to follow-up. The 73 patients (82 hips) who did not have an infection were subjected to a clinical assessment and radiological review. The radiographs were assessed for the presence of radiolucent lines according to the zones described by DeLee and Charnley.3 Because of significant interobserver and intraobserver error in the interpretation and reporting of radiolucent lines only those of 2 mm or more and occupying at least one-third of a zone were reported. 4 A titanium screw was used in all cups to aid primary stability and the presence of a fractured screw was recorded at the latest follow-up. Failure was defined as an acetabular cup which required revision for aseptic loosening or had migrated obviously on the plain radiographs.Survival rates were calculated using life tables and the Kaplan-Meier method.

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Section: Discussionsupporting

confidence: 58%

Poor results of the Freeman uncemented metal-backed acetabular component

Journeaux

Morgan

Donnelly

2000

The Journal of Bone and Joint Surgery. British volume

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“…The Epoch ® stem (Zimmer, Inc., Indiana, USA) showed excellent short to mid-term results [21,22]. The early results of Ribbed stem (Waldemar LINK GmbH & Co., Humburg, Germany) were poor [23][24][25], but recently the clinical outcomes have been very well after the manufacturer added HA coating on the stem surface [26,27]. With modern design and manufacture technology, it is possible to keep both initial stability and lower stiffness of a hip stem.…”

Section: Discussionmentioning

confidence: 99%

Design and test of hip stem for medullary revascularization

Yang

Wei

Kao

et al. 2009

Medical Engineering & Physics

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“…Comparatively high rates of migration have been reported for uncemented femoral components of press-fit design (Wykman, Selvik and Goldie 1988;Nistor et al 1991;Kärrholm and Snorrason 1993;Nistor, Lundberg and Ackerholm 1994) and types of acetabular screw ring (Snorrason and Kärrholm 1990) which are known to have high revision rates at longer follow-up (Tallroth et al 1993;Jensen, Christensen and Hørlyck 1994;Bruijn et al 1995;Malchau et al 1995;Savilahti et al 1995;Sweetnam et al 1995). The EBRA method of assessing migration has given similar results for migration of the PCA cup (Krismer et al 1994).…”

Section: Rsa In the Assessment Of Aseptic Looseningmentioning

confidence: 98%