Cementless Fixation of ???Isoelastic??? Hip Endoprostheses Manufactured from Plastic Materials

Morscher, E.; Dick, W.

doi:10.1097/00003086-198306000-00010

Cited by 51 publications

(35 citation statements)

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“…The concept of a cementless "isoelastic" hip stem was reportedly conceived in 1967 by Robert Mathys as an alternative to the cemented metallic hip implant design developed by Sir John Charnley [155,156]. The isoelastic hip stem was intended to replicate the stiffness to the femur, to reduce stress shielding and improve implant fixation.…”

Section: Femoral Stemsmentioning

confidence: 99%

“…This device was inserted without cement, and used a proximal lag screw for fixation. Loosening of this prosthesis, attributed to poor clinical technique and excessive proximal micromotion, also led to a second, and ultimately a third generation of the RM Isoelastic Cementless Hip Prosthesis (RMI) [155,156]. These subsequent generations differed in geometric design, but retained the same polyacetal copolymer fixation interface.…”

Section: Femoral Stemsmentioning

confidence: 99%

“…These subsequent generations differed in geometric design, but retained the same polyacetal copolymer fixation interface. Despite encouraging short-term clinical results [155,156], longer investigation, with an average follow-up of 42 months, revealed unacceptably high rates of mechanical loosening for the third-generation RMI prosthesis [157]. By 1988, Jakim and coworkers noted that, "the concept of isoelasticity that has attracted many surgeons has failed to fulfill original clinical expectations" [157].…”

Section: Femoral Stemsmentioning

confidence: 99%

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PEEK biomaterials in trauma, orthopedic, and spinal implants

Kurtz

Devine²

2007

Biomaterials

1,983

1,518

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Since the 1980s, polyaryletherketones (PAEKs) have been increasingly employed as biomaterials for trauma, orthopedic, and spinal implants. We have synthesized the extensive polymer science literature as it relates to structure, mechanical properties, and chemical resistance of PAEK biomaterials. With this foundation, one can more readily appreciate why this family of polymers will be inherently strong, inert, and biocompatible. Due to its relative inertness, PEEK biomaterials are an attractive platform upon which to develop novel bioactive materials, and some steps have already been taken in that direction, with the blending of HA and TCP into sintered PEEK. However, to date, blended HA-PEEK composites have involved a trade-off in mechanical properties in exchange for their increased bioactivity. PEEK has had the greatest clinical impact in the field of spine implant design, and PEEK is now broadly accepted as a radiolucent alternative to metallic biomaterials in the spine community. For mature fields, such as total joint replacements and fracture fixation implants, radiolucency is an attractive but not necessarily critical material feature.

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Section: Femoral Stemsmentioning

confidence: 99%

Section: Femoral Stemsmentioning

confidence: 99%

Section: Femoral Stemsmentioning

confidence: 99%

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PEEK biomaterials in trauma, orthopedic, and spinal implants

Kurtz

Devine²

2007

Biomaterials

1,983

1,518

View full text Add to dashboard Cite

show abstract

“…The rate of infection related to surgery is affected by many variables: the presence of underlying disease, the type of surgery, the duration of the operation, previous surgery or infection at the site, surgical technique, and the composition of the material implanted. The rate of infection for first-time implantation of an artificial hip is generally less than 2% (18,19,33,40), while knee replacement is reported to carry a <0.6 to 11% risk of infection, depending upon the type of implant (48,49).…”

Section: Orthopedic Prosthesesmentioning

confidence: 99%

Infections associated with indwelling devices: infections related to extravascular devices

Dickinson

Bisno

1989

Antimicrob Agents Chemother

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“…Therefore, materials of substantially lower elastic modulus may be desirable in the design of uncemented femoral components [21].…”

Section: Femoral Component Design In Hip Arthroplastymentioning

confidence: 99%

Functional adaptation of the human locomotor system to normal and abnormal loading patterns

Poss

1984

Calcif Tissue Int

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The adaptation of bone to its mechanical environment can be understood only in the context of its relationships to the soft tissues of the locomotor system, and its dual requirements to provide structural support and preserve articular cartilage. Radiographic analysis of the human skeleton provides insights into the nature of load transmission. Bone's adaptation to abnormal situations such as arthritis, or total joint implants, provides information about the limits of its tolerance to altered load or strain patterns. Knowledge gained from analysis of the first 20 years of total joint arthroplasty should provide prostheses of improved design and materials in the future.

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Cementless Fixation of ???Isoelastic??? Hip Endoprostheses Manufactured from Plastic Materials

Cited by 51 publications

References 0 publications

PEEK biomaterials in trauma, orthopedic, and spinal implants

PEEK biomaterials in trauma, orthopedic, and spinal implants

Infections associated with indwelling devices: infections related to extravascular devices

Functional adaptation of the human locomotor system to normal and abnormal loading patterns

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