Stability of Uncemented Cups — Long-Term Effect of Screws, Pegs and HA Coating

Otten, Volker; Crnalic, Sead; Röhrl, Stephan M; Nivbrant, Bo; Nilsson, Kjell

doi:10.1016/j.arth.2015.07.012

Cited by 27 publications

(32 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, an increased wear rate of 0.21 mm/year was found by 1 study over the 14-year follow-up (Otten et al. 2016 ). This is more than twice the wear rate that we found.…”

Section: Discussionmentioning

confidence: 91%

“… 2000 ; Otten et al. 2016 ). Both studies used titanium alloy cups with polyethylene liners, in contrast to the all-polyethylene cups used in the current study.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, the results of long-term follow-up in the latter study were published—again showing no difference between the groups (Otten et al. 2016 ). The results on migration and wear from these studies using titanium implants are difficult to compare with the results with the titanium-coated all-polyethylene cup in the present study.…”

mentioning

confidence: 94%

See 2 more Smart Citations

No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome

2016

View full text Add to dashboard Cite

Background and purposeAdditional screw fixation of the all-polyethylene press-fit RM cup (Mathys) has no additional value for migration, in the first 2 years after surgery. However, the medium-term and long-term effects of screw fixation remain unclear. We therefore evaluated the influence of screw fixation on migration, wear, and clinical outcome at 6.5 years using radiostereometric analysis (RSA).Patients and methodsThis study involved prolonged follow-up from a previous randomized controlled trial (RCT). We analyzed RSA radiographs taken at baseline and at 1-, 2-, and 6.5-year follow-up. Cup migration and wear were assessed using model-based RSA software. Wear was calculated as translation of the femoral head model in relation to the cup model. Total translation, rotation, and wear were calculated mathematically from results of the orthogonal components.Results27 patients (15 with screw fixation and 12 without) were available for follow-up at 6.5 (5.6–7.2) years. Total translation (0.50 mm vs. 0.56 mm) and rotation (1.01 degrees vs. 1.33 degrees) of the cup was low, and was not significantly different between the 2 groups. Wear increased over time, and was similar between the 2 groups (0.58 mm vs. 0.53 mm). Wear rate (0.08 mm/year vs. 0.09 mm/year) and clinical outcomes were also similar.InterpretationOur results indicate that additional screw fixation of all-polyethylene press-fit RM cups has no additional value regarding medium-term migration and clinical outcome. The wear rate was low in both groups.

show abstract

“…Nevertheless, an increased wear rate of 0.21 mm/year was found by 1 study over the 14-year follow-up (Otten et al. 2016 ). This is more than twice the wear rate that we found.…”

Section: Discussionmentioning

confidence: 91%

“… 2000 ; Otten et al. 2016 ). Both studies used titanium alloy cups with polyethylene liners, in contrast to the all-polyethylene cups used in the current study.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome

2016

View full text Add to dashboard Cite

show abstract

“…The data for this study resulted from a 14-year follow-up of total hip arthroplasty [ 21 ] whose purpose was to investigate the influence of different cup augmentation on cup stability and liner wear. Sixty-three patients (68 hips: 31 men, median age (range) 56 (36–66) years, median weight (range) 75 (51–102) kg) with primary and secondary hip osteoarthritis (OA) underwent total hip arthroplasty between 1995 and 1997 at the Department of Orthopedics, Umeå University Hospital.…”

Section: Methodsmentioning

confidence: 99%

Are CT Scans a Satisfactory Substitute for the Follow-Up of RSA Migration Studies of Uncemented Cups? A Comparison of RSA Double Examinations and CT Datasets of 46 Total Hip Arthroplasties

Otten

Maguire

Noz

et al. 2017

BioMed Research International

Self Cite

View full text Add to dashboard Cite

As part of the 14-year follow-up of a prospectively randomized radiostereometry (RSA) study on uncemented cup fixation, two pairs of stereo radiographs and a CT scan of 46 hips were compared. Tantalum beads, inserted during the primary operation, were detected in the CT volume and the stereo radiographs and used to produce datasets of 3D coordinates. The limit of agreement between the combined CT and RSA datasets was calculated in the same way as the precision of the double RSA examination. The precision of RSA corresponding to the 99% confidence interval was 1.36°, 1.36°, and 0.60° for X-, Y-, and Z-rotation and 0.40, 0.17, and 0.37 mm for X-, Y-, and Z-translation. The limit of agreement between CT and RSA was 1.51°, 2.17°, and 1.05° for rotation and 0.59, 0.56, and 0.74 mm for translation. The differences between CT and RSA are close to the described normal 99% confidence interval for precision in RSA: 0.3° to 2° for rotation and 0.15 to 0.6 mm for translation. We conclude that measurements using CT and RSA are comparable and that CT can be used for migration studies for longitudinal evaluations of patients with RSA markers.

show abstract

“…Plasma-sprayed HA coating results in better bony ingrowth and early implant fixation in experimental studies (Soballe et al 1992, Daugaard et al 2010). However, clinical results have not truly been able to show superior cementless cup fixation with HA over porous coating at midterm (Rohrl et al 2004, Valancius et al 2013 or long-term (Otten et al 2016, Lazarinis et al 2017.…”

mentioning

confidence: 99%

Higher early proximal migration of hemispherical cups with electrochemically applied hydroxyapatite (BoneMaster) on a porous surface compared with porous surface alone: a randomized RSA study with 53 patients

et al. 2019

View full text Add to dashboard Cite

show abstract

Stability of Uncemented Cups — Long-Term Effect of Screws, Pegs and HA Coating

Cited by 27 publications

References 31 publications

No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome

No effect of additional screw fixation of a cementless, all-polyethylene press-fit socket on migration, wear, and clinical outcome

Are CT Scans a Satisfactory Substitute for the Follow-Up of RSA Migration Studies of Uncemented Cups? A Comparison of RSA Double Examinations and CT Datasets of 46 Total Hip Arthroplasties

Higher early proximal migration of hemispherical cups with electrochemically applied hydroxyapatite (BoneMaster) on a porous surface compared with porous surface alone: a randomized RSA study with 53 patients

Contact Info

Product

Resources

About