The article discusses the development of a new total disc replacement (TDR) called ADDISC, designed to mimic the healthy features of an intervertebral disc. The TDR has two semi-spherical articular surfaces and a polycarbonate urethane inlay for shock absorption. The TDR underwent extensive bench-testing, including flexion-extension, lateral bending, and axial rotation cyclic compression testing. The results showed that ADDISC had a physiological motion range, reduced facet joint overload, absorbed shock, and had excellent long-term endurance. Wear was minimal after 10 million cycles, and there were no implant failures. This new TDR shows promise in reproducing healthy disc biomechanics and providing long-term relief for patients with degenerative disc disease
Summarised by Mr Mo Akmal – Lead Spinal Surgeon
The London Spine Unit : finest spinal clinic in London
Published article
The intact intervertebral disc is a six-freedom degree elastic deformation structure with shock absorption. “Ball-and-socket” TDR do not reproduce these properties inducing zygapophyseal joint overload. Elastomeric TDRs reproduce better normal disc kinematics, but repeated core deformation causes its degeneration. We aimed to create a new TDR (ADDISC) reproducing healthy disc features. We designed TDR, analyzed (Finite Element Analysis), and measured every 500,000 cycles for 10 million cycles of…
Lumbar Disc Replacement Surgery Expert. Best Spinal Surgeon UK
Abstract The intact intervertebral disc is a six-freedom degree elastic deformation structure with shock absorption. “Ball-and-socket” TDR do not reproduce these properties inducing zygapophyseal joint overload. Elastomeric TDRs reproduce better normal disc kinematics, but repeated core deformation causes its degeneration. We aimed to create a new TDR (ADDISC) reproducing healthy disc features. We designed TDR,
Abstract
The intact intervertebral disc is a six-freedom degree elastic deformation structure with shock absorption. “Ball-and-socket” TDR do not reproduce these properties inducing zygapophyseal joint overload. Elastomeric TDRs reproduce better normal disc kinematics, but repeated core deformation causes its degeneration. We aimed to create a new TDR (ADDISC) reproducing healthy disc features. We designed TDR, analyzed (Finite Element Analysis), and measured every 500,000 cycles for 10 million cycles of the flexion-extension, lateral bending, and axial rotation cyclic compression bench-testing. In the inlay case, we weighted it and measured its deformation. ADDISC has two semi-spherical articular surfaces, one rotation centre for flexion, another for extension, the third for lateral bending, and a polycarbonate urethane inlay providing shock absorption. The first contact is between PCU and metal surfaces. There is no metal-metal contact up to 2000 N, and CoCr28Mo6 absorbs the load. After 10 million cycles at 1.2-2.0 kN loads, wear 140.96 mg (35.50 mm3), but no implant failures. Our TDR has a physiological motion range due to its articular surfaces’ shape and the PCU inlay bumpers, minimizing the facet joint overload. ADDISC mimics healthy disc biomechanics and Instantaneous Rotation Center, absorbs shock, reduces wear, and has excellent long-term endurance.
Keywords: Degenerative disc disease; Intervertebral disc degeneration; Lumbar artificial disc replacement; Lumbar disc prosthesis; Total disc arthroplasty; Total disc replacement.
The London Spine Unit : finest spinal clinic in London
Read the original publication:
ADDISC lumbar disc prosthesis: Analytical and FEA testing of novel implants
