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Pitkin, Mark R.

doi:10.1682/jrrd.2008.08.0112

Cited by 29 publications

(7 citation statements)

References 108 publications

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“…The fins are meant to reduce the risk of implant subsidence and stress shielding. It was hypothesized further that placing the fins into precut slots in the bone walls would stimulate the regeneration of the bone cells in the circular direction relative to the bone longitudinal axis instead of the radial regeneration seen during total joint replacement [13,35]. The circular regeneration and the longitudinal regeneration are natural components of bone fracture healing.…”

Section: Introductionmentioning

confidence: 99%

New method of fixation of in-bone implanted prosthesis

Pitkin

Cassidy²,

Muppavarapu³

et al. 2013

JRRD

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This article presents results on the effectiveness of a new version of the titanium porous composite skin and bone integrated pylon (SBIP). The SBIP is designed for direct skeletal attachment of limb prostheses and was evaluated in a pre-clinical study with three rabbits. In accordance with the study protocol, a new version of the pylon (SBIP-3) was implanted into the hind leg residuum of three rabbits. The SBIP-3 has side fins that are designed to improve the bond between the bone and pylon. The fins are positioned inside two slots precut in the bone walls; their length can be adjusted to match the thickness of the bone walls. After 13 (animal 1) or 26 wk (animals 2 and 3), the animals were sacrificed and samples collected for histopathological analysis. The space between the fins and the bone into which they were fit was filled with fibro-vascular tissue and woven bone. No substantial inflammation was found. We suggest that if further studies substantiate the present results, the proposed method can become an alternative to the established technique of implanting prostheses into the medullar canal of the hosting bone.

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Section: Introductionmentioning

confidence: 99%

New method of fixation of in-bone implanted prosthesis

Pitkin

Cassidy²,

Muppavarapu³

et al. 2013

JRRD

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“…An alternative to the original two-step procedure of direct skeletal attachment is a one-step technique [21–24], which we used in the current study. For the one-step transcutaneous implantation we used device called a pylon, one end of which is implanted in the bone and the other is positioned outside of the residuum for connection with the limb prosthesis.…”

Section: Introductionmentioning

confidence: 99%

Recording of Electric Signal Passing Through a Pylon in Direct Skeletal Attachment of Leg Prostheses With Neuromuscular Control

Pitkin

Cassidy

Muppavarapu

et al. 2012

IEEE Trans. Biomed. Eng.

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Direct recordings were made of electrical signals emanating from the muscles in a rabbit’s residuum. The signals were transmitted via wires attached on one end to the muscles, and on the other to an external recording system. The cable was held in a titanium tube inside a pylon that had been transcutaneously implanted into the residuum’s bone. The tube was surrounded by porous titanium cladding to enhance its bond with the bone and with the skin of the residuum. This study was the first known attempt to merge the technology of direct skeletal attachment of limb prostheses with the technology of neuromuscular control of prostheses, providing a safe and reliable passage of the electrical signal from the muscles inside the residuum to the outside recording system.

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“…This type of prosthesis often causes discomfort to the patients and, in extreme cases, leads to skin irritation and pressure ulcers. In addition, quality of life can be affected as a result of limited force transfer and motor control, as studied by Pitkin et al [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Noncontact Strain Monitoring of Osseointegrated Prostheses

Gupta

Lee

Loh

et al. 2018

Sensors

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The objective of this study was to develop a noncontact, noninvasive, imaging system for monitoring the strain and deformation states of osseointegrated prostheses. The proposed sensing methodology comprised of two parts. First, a passive thin film was designed such that its electrical permittivity increases in tandem with applied tensile loading and decreases while unloading. It was found that patterning the thin films could enhance their dielectric property’s sensitivity to strain. The film can be deposited onto prosthesis surfaces as an external coating prior to implant. Second, an electrical capacitance tomography (ECT) measurement technique and reconstruction algorithm were implemented to capture strain-induced changes in the dielectric property of nanocomposite-coated prosthesis phantoms when subjected to different loading scenarios. The preliminary results showed that ECT, when coupled with strain-sensitive nanocomposites, could quantify the strain-induced changes in the dielectric property of thin film-coated prosthesis phantoms. The results suggested that ECT coupled with embedded thin films could serve as a new noncontact strain sensing method for scenarios when tethered strain sensors cannot be used or instrumented, especially in the case of osseointegrated prostheses.

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Untitled

Cited by 29 publications

References 108 publications

New method of fixation of in-bone implanted prosthesis

New method of fixation of in-bone implanted prosthesis

Recording of Electric Signal Passing Through a Pylon in Direct Skeletal Attachment of Leg Prostheses With Neuromuscular Control

Noncontact Strain Monitoring of Osseointegrated Prostheses

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