Long-term results of the M2A-38-mm metal-on-metal articulation

Trévisan, C.; Piscitello, Stefano; Klumpp, Raymond; Mascitti, Tonino

doi:10.1186/s10195-018-0514-y

Cited by 4 publications

(3 citation statements)

References 34 publications

(30 reference statements)

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“…The cumulative survival rate was 94.0% at five years, 89.6% at 10 years and 82.9% at 14.6 years. These study results are similar to those of previous studies in which the cumulative survival rate varied from 95 to 97% at five years, 85 98% at 10 years and 74% at 13 years [23][24][25]. Patient characteristics did not show any other statistical significance risk factor for ARMD revision than age.…”

Section: Discussionsupporting

confidence: 90%

Long-term survival analysis of cementless large-diameter head metal-on-metal total hip arthroplasty

Holappa

Kettunen

Miettinen

et al. 2022

Arch Orthop Trauma Surg

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Introduction The aim of this retrospective study was to study the long-term survival and reasons for revisions of a single-type, large-diameter head (LDH) metal-on-metal (MoM) implant. A special study interest was to find the threshold level for revision in terms of adverse reaction to metal debris (ARMD). Materials and Methods In this cohort study, we retrospectively reviewed 234 patients (253 hips) who received 38 mm head size LDH MoM total hip arthroplasties (THAs) between 01 January 2004 and 31 December 2009 at our institution. Patient symptoms, conventional radiographs, magnetic resonance imaging (MRI) findings and whole blood metal ions were studied. Results The median follow-up time was 11.5 years. The Kaplan–Meier cumulative survival estimate of the implant was 89.6% at 10 years and 82.9% at 14.6 years. Overall, 34/253 (13.4%) hips were revised during the follow-up period and of these; 19/34 (55.9%) were revised due to ARMD. The prevalence of ARMD was 12.4% (29/234 patients). Conclusions The survival of the implant was on a moderate level as the 10-year cumulative survival rate was 89.6%. The exact threshold level for ARMD revision cannot be determined due to multiple variables affecting factors in re-operation decision-making.

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Section: Discussionsupporting

confidence: 90%

Long-term survival analysis of cementless large-diameter head metal-on-metal total hip arthroplasty

Holappa

Kettunen

Miettinen

et al. 2022

Arch Orthop Trauma Surg

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“…35% of failures were due to failure of socket in growth suggesting a technical problem of these surgeons with implanting this device. Another small series of the M2a-38 bearing in 80 patients with 84% rate of follow-up by Trevisan et al [13] had one failure at 10 years postoperative due to a loose cup and another failure at 13 years postoperative due to an asymptomatic uid collection with increased blood metal ion levels. KM implant survivorship was 98% at 10 years and 74% by 13 years postoperative.…”

Section: Discussionmentioning

confidence: 99%

Long-Term Clinical Outcomes of the Biomet M2a-38: a Retrospective Review of 335 Total Hip Arthroplasty Cases

Campbell

Gross

Jones

2023

Preprint

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Background: At the turn of the century, over one-third of total hip arthroplasties comprised metal-on-metal bearings. As this patient population and their implants age, it is crucial to understand associated late failure modes and expected long-term functional outcomes. We report the long-term results of a large metal-on-metal uncemented total hip arthroplasty system with unique design characteristics compared to others that have been reported with high failure rates. Methods: We retrospectively analyze our prospective clinical database to determine overall implant survivorship and functional outcomes. Further, we compare these results to the clinical outcomes reported in orthopedic registries and in other published studies with similar metal-on-metal total hip arthroplasty cohorts. Results: Implant survivorship at 10 years was 99.1% and continued to 97.6% survivorship at 20 years. Implant survivorship at 20 years did not vary significantly between sexes (Male: 98.3%, Female: 97.2%; log-rank p-value=0.46). Mean whole blood cobalt levels were 2.6 µg/L in unilateral cases, 5.3 µg/L in bilateral patients, and 3.4 µg/L for the combined cohort. Average blood chromium levels were 1.4 µg/L in unilateral patients, 2.9 µg/L in bilateral patients, and 1.8 µg/L for group combined. We observed a 0.9% rate of failure due trunnion corrosion at a mean of 13.1 years postoperatively (10.6-15.6 years) but had no bearing wear failures. Conclusions: Our 20-year implant survivorship of 97.6% with the M2a-38 bearing surpassed registry benchmarks for THA. This large-bearing (38 mm), full hemisphere coverage metal-on-metal system had no bearing wear failures, one failure of instability, one failure of fixation, and three trunnion failures, perhaps suggesting an optimum balance between stability of the joint and the trunnion.

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“…Another small series of the M2a-38 bearing in 80 patients with 84% rate of follow-up by Trevisan et al . [ 12 ] had one failure at 10 years postoperative due to a loose cup and another failure at 13 years postoperative due to an asymptomatic fluid collection with increased blood metal ion levels. KM implant survivorship was 98% at 10 years and 74% by 13 years postoperative.…”

Section: Discussionmentioning

confidence: 99%

Long-term clinical outcomes of the Biomet M2a-38: a retrospective review of 335 total hip arthroplasty cases

Jones,

Gaillard-Campbell,

Gross

2023

J Orthop Surg Res

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Background At the turn of the century, over one-third of total hip arthroplasties comprised metal-on-metal bearings. As this patient population and their implants age, it is crucial to understand associated late failure modes and expected long-term functional outcomes. We report the long-term results of a large metal-on-metal uncemented total hip arthroplasty system with unique design characteristics compared to others that have been reported with high failure rates. Methods We retrospectively analyze our prospective clinical database to determine overall implant survivorship and functional outcomes. Further, we compare these results to the clinical outcomes reported in orthopedic registries and in other published studies with similar metal-on-metal total hip arthroplasty cohorts. Results Implant survivorship at 10 years was 99.1% and continued to 97.6% survivorship at 20 years. Implant survivorship at 20 years did not vary significantly between sexes (Male: 98.3%, Female: 97.2%; log-rank p-value = 0.46). Mean whole blood cobalt levels were 2.6 µg/L in unilateral cases, 5.3 µg/L in bilateral patients, and 3.4 µg/L for the combined cohort. Average blood chromium levels were 1.4 µg/L in unilateral patients, 2.9 µg/L in bilateral patients, and 1.8 µg/L for group combined. We observed a 0.9% rate of failure due trunnion corrosion at a mean of 13.1 years postoperatively (10.6–15.6 years) but had no bearing wear failures. Conclusions Our 20-year implant survivorship of 97.6% with the M2a-38 bearing surpassed registry benchmarks for THA. This large-bearing (38 mm), full hemisphere coverage metal-on-metal system had no bearing wear failures, one failure of instability, one failure of fixation, and three trunnion failures, perhaps suggesting an optimum balance between stability of the joint and the trunnion.

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Long-term results of the M2A-38-mm metal-on-metal articulation

Cited by 4 publications

References 34 publications

Long-term survival analysis of cementless large-diameter head metal-on-metal total hip arthroplasty

Long-term survival analysis of cementless large-diameter head metal-on-metal total hip arthroplasty

Long-Term Clinical Outcomes of the Biomet M2a-38: a Retrospective Review of 335 Total Hip Arthroplasty Cases

Long-term clinical outcomes of the Biomet M2a-38: a retrospective review of 335 total hip arthroplasty cases

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