High Re-Operation Rates Using Conserve Metal-On-Metal Total Hip Articulations

Mogensen, Signe Sloth; Jakobsen, Thomas; Christoffersen, Hardy; Krarup, Niels

doi:10.2174/1874325001610010041

Cited by 2 publications

(2 citation statements)

References 38 publications

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“…The majority of high failure rates have been reported for either hip resurfacings or large-head metal-on-metal THAs leading to increased revision rates, because of pseudotumors in symptomatic patients or distinct elevated blood metal levels. [24][25][26][27] However, concerns have also grown in the long-term development of pseudotumors in small-head metal-on-metal THAs, which used to be at lower risk for pseudotumors in the past. [6,28,29]…”

Section: Discussionmentioning

confidence: 99%

Pseudotumors in Small-Head Metal-on-Metal Total Hip Arthroplasties at a Minimum Follow-Up of 20 Years

Kolbitsch

Noebauer-Huhmann

Giurea

et al. 2021

The Journal of Arthroplasty

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Section: Discussionmentioning

confidence: 99%

Pseudotumors in Small-Head Metal-on-Metal Total Hip Arthroplasties at a Minimum Follow-Up of 20 Years

Kolbitsch

Noebauer-Huhmann

Giurea

et al. 2021

The Journal of Arthroplasty

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“…This is based on the pre-market approval (PMA) process in 2385 patients with non-inflammatory or inflammatory arthritis receiving the Birmingham Hip Resurfacing (BHR) System (Smith & Nephew Orthopaedics, Memphis, TN) [ 36 , 37 ]. Later, in 2007 and 2009, the US FDA approved the clinical use of two additional MoM resurfacing implants, such as the Cormet™ Hip Resurfacing System (Corin, Tampa, FL, USA) and the Conserve ® Plus Total Hip Resurfacing System (MicroPort Orthopedics, Boston, MA, USA), respectively, in patients with non-inflammatory degenerative or inflammatory arthritis [ 38 , 39 ]. Since then, the US FDA has cleared a variety of implants for marketing through the 510(k) process [ 40 ].…”

Section: Introductionmentioning

confidence: 99%

A Pilot Experiment to Measure the Initial Mechanical Stability of the Femoral Head Implant in a Cadaveric Model of Osteonecrosis of Femoral Head Involving up to 50% of the Remaining Femoral Head

2023

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Background and Objectives: Currently, only patients with osteonecrosis of the femoral head (ONFH), who had bone defects involving 30–33.3% of the remaining femoral head, are indicated in hip resurfacing arthroplasty (HRA). In an experimental cadaver model of ONFH involving up to 50% of the remaining femoral head, the initial stability of the femoral head implant (FHI) at the interface between the implant and the remaining femoral head was measured. Materials and Methods: The ten specimens and the remaining ten served as the experimental group and the control group, respectively. We examined the degree of the displacement of the FHI, the bonding strength between the FHI and the retained bone and that at the interface between the FHI and bone cement. Results: Changes in the degree of displacement at the final phase from the initial phase were calculated as 0.089 ± 0.036 mm in the experimental group and 0.083 ± 0.056 mm in the control group. However, this difference reached no statistical significance (p = 0.7789). Overall, there was an increase in the degree of displacement due to the loading stress, with increased loading cycles in both groups. In cycles of up to 6000 times, there was a steep increase. After cycles of 8000 times, however, there was a gradual increase. Moreover, in cycles of up to 8000 times, there was an increase in the difference in the degree of displacement due to the loading stress between the two groups. After cycles of 8000 times, however, such difference remained almost unchanged. Conclusions: In conclusion, orthopedic surgeons could consider performing the HRA in patients with ONFH where the bone defects involved up to 50% of the remaining femoral head, without involving the femoral head–neck junction in the anterior and superior area of the femoral head. However, more evidence-based studies are warranted to justify our results.

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High Re-Operation Rates Using Conserve Metal-On-Metal Total Hip Articulations

Cited by 2 publications

References 38 publications

Pseudotumors in Small-Head Metal-on-Metal Total Hip Arthroplasties at a Minimum Follow-Up of 20 Years

Pseudotumors in Small-Head Metal-on-Metal Total Hip Arthroplasties at a Minimum Follow-Up of 20 Years

A Pilot Experiment to Measure the Initial Mechanical Stability of the Femoral Head Implant in a Cadaveric Model of Osteonecrosis of Femoral Head Involving up to 50% of the Remaining Femoral Head

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