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"To biomechanically compare plated constructs using nonlocking bone-screw-fasteners with interlocking threads verses locking screws with traditional buttress threads in geriatric female bone."​


"In female geriatric bone, constructs fixed with bone-screw-fasteners incorporate multiplanar interlocking thread geometry and performed similarly to traditional locked plating."


International Journal of Spine Surgery


"Instrumentation with the SI screw fixation device significantly reduced mean joint ROM compared to the destabilized condition, with similar ROM in flexion-extension and axial rotation, and it significantly reduced ROM in lateral bending compared to that for the intact joint. The ROM values observed with the instrumented

condition were comparable to levels of mobility considered favorable for spinal fusion."

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Journal of Orthopedic Trauma


"We hypothesized that a new Bone-Screw-Fastener with an innovative interlocking thread design demonstrates increased resistance to torque stripping forces compared with the buttress screw, without compromising pullout strength."​


"These data demonstrate the superiority of the new Bone-Screw-Fastener over the conventional AO buttress screw regarding protection from torque stripping forces. In addition, the new thread design that interlocks to the bone does not sacrifice axial pullout resistance conveyed by the buttress screw."


Patient Safety in Surgery


"A new patented Bone-Screw-Fastener was recently designed that is based on an interlocking thread technology. The new fastener provides distributive forces from the threads onto the bone and therefore resists loads in multiple directions."​

Implications of hypothesis

"Once validated in multicenter RCTs, the new Bone-Screw-Fastener may drive a change in paradigm with regard to its innovative biomechanical principles and biologic bone preservation for surgical applications requiring screw fixation."


International Society of Limb Salvage 21st Annual Conference

Los Angeles, CA, 2022.​

A Mechanical Integration Rationale for Securing Implants to Bone in Orthopedic Oncology


A mechanical integration rationale can be used to design orthopedic implants for use in bone. Initial mechanical testing demonstrates several benefits over a standard thread form. There are likely to be several clinical benefits associated with this type of design, which in particular benefit the orthopedic oncology population including multi-axial stability in compromised bone, shorter implants to allow for revision, and better load sharing/distribution to complement osseointegration.

Abraham JA, Geller DS, Fauth AR, Bitter J, Paul R.

International Society of Limb Salvage 21st Annual Conference

Los Angeles, CA, 2022

Design Elements of a Mechanically Integrated Intramedullary Stem for use in
Orthopedic Oncology


A mechanically integrated intramedullary implant represents an entirely novel approach and may have significant benefits over traditional methods of fixation of implants to bone, particularly in the orthopedic oncology population. Initial Early FEA and biomechanical testing are encouraging and demonstrate more even force distribution and more intimate contact between the bone and the implant under dynamic conditions.

Abraham JA, Geller DS, Fauth AR, Bitter J, Paul R.

Musculoskeletal Tumor Society Annual Meeting

Clearwater, FL, 2022

Design Elements of an Intramedullary Stem Utilizing a Mechanical Integration Rationale


Mechanical integration offers an innovative method to connect implants to bone in tumor/limb salvage scenarios. The transfer of applied stress is circumferential and independent of the direction of applied force, as shown by FEA.  A mechanically integrated stem may achieve superior fixation to a traditional stem, even at a shorter length.  Removal of a mechanical integrate stem may be easier or mitigate bone loss.

Abraham JA, Geller DS, Fauth AR, Bitter J, Paul R.

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