White Papers

Improving Pedicle Screw Fixation in Lumbar Spinal Fusion

Orthopaedic Innovation Centre

Many people in North America suffer from severe back pain. To remedy, patients may undergo surgical intervention to immobilize the affected areas by means of spinal fusion. In spinal fusion, screws are implanted into neighbouring vertebrae and joined by rods to create a rigid construct, thereby promoting intervertebral fusion. Unfortunately, a reasonable portion of these procedures suffer from fusion failure.

To improve the success rate of spinal fusion, the Orthopaedic Innovation Centre (Winnipeg, Canada) has been working with orthopaedic surgeons and residents from the Health Sciences Centre (Winnipeg, Canada) to study pedicle screw fixation in lumbar spinal fusion.

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    Utilization of Radiostereometric Analysis (RSA) to Assess Quality of Spinal Fusion

    Orthopaedic Innovation Centre

    Spinal fusion is a surgical treatment to manage traumatic, degenerative, deformative and infectious diseases of the spine. Unfortunately, a portion of spinal fusions result in complications involving adjacent-segment degeneration and fusion failure.

    The Orthopaedic Innovation Centre (OIC) is a research and engineering facility in Winnipeg, Manitoba, that dedicates 50 per cent of their work towards clinical RSA research studies. They have recently completed a phantom study that assessed the feasibility of RSA as a technique for diagnosing successful or failed spinal fusion.

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      Surface Guided Knee White Paper
      Testing and Validation of a Patient-specific, Surface-guided Total Knee Replacement

      Orthopaedic Innovation Centre

      The white paper describes the extensive development of the technology as well as results of numerous validation tests performed on a surface-guided knee prototype. These works, which have been published in numerous peer-reviewed journals, demonstrate the superiority of the design in terms of:

      • Guided, patient-specific knee kinematics with more precise implant fit
      • High range of motion with up to 155° of flexion, up to 22° external rotation of the femur, and 12 mm of femoral rollback
      • Joint stability without relying on ligaments
      • Low articular surface pressure which reduces risk of polyethylene damage and lowers wear rate

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        White Paper
        Pilot Study: The Effect of Femoral Head Roughening Techniques on Polyethylene Wear in Total Hip Replacements

        Orthopaedic Innovation Centre

        Three different femoral head roughening techniques were selected in order to investigate their effect on polyethylene wear. We found that tumbling the femoral heads provided a consistent roughened surface finish. It was also shown to produce the most consistent wear rates. Wear rates generally increased when the lubricant protein concentration was increased from 17 g/L to 30 g/L. Surface roughness measurements from retrieved femoral heads showed that artificial roughening beyond an average roughness of 0.30 μm may not be clinically relevant, and that certain methods of artificial femoral head roughening can produce excessive wear. It is recommended that ensuring a consistent and repeatable method for artificial roughening will maintain the integrity of the surface finish and the wear test.

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