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Zimmer, Inc.

TM Ardis™ Interbody System

Product Description

This interbody fusion system offers the benefits of Trabecular Metal™ Technology with a modern, anatomical shape. The easily inserted TM Ardis Interbody System facilitates an efficient, reproducible spinal fusion procedure with a self-distracting nose, convex geometry and wide range of sizes. The unique interbody system is designed for versatility – it can be used in a variety of open or MIS surgical applications.

This system is made from the only material that offers up to 80% porosity, stability, and flexibility - Trabecular Metal Technology. This interbody fusion device offers an osteoconductive scaffold which allows for boney in-growth into the material of the implant, a high coefficient of friction to help prevent migration and expulsion, and a low modulus of elasticity allowing for more normal load transfer.

Features

  • Enables boney in-growth
    Serves as an osteoconductive scaffold for bone growth into the material of the implant and vascularization

  • Provides initial stability
    A high coefficient of friction helps prevent device migration and expulsion

  • Delivers load sharing characteristics similar to bone
    A modulus of elasticity similar to cancellous bone improves load sharing which has the potential to minimize stress shielding

  • Conforms to varying patient anatomy
    Wide variety of size offerings and convex shape conforms for varying patient anatomy to maximize endplate-implant contact

ZS-OUS0050-02

No other porous material so closely resembles the structure, function and physiology of trabecular bone.

Trabecular Metal Material is a highly porous structure with a nano-textured strut architecture that creates an initial scratch fit and facilitates the long-term biologic attachment of orthopaedic implants via the potential for bone ingrowth. Trabecular Metal Material is the most advanced fixation surface available for orthopaedic implants. Clinical use since 1997 demonstrates that this innovative technology provides excellent initial scratch fit and stable, long-term fixation. No other porous metal material so closely resembles the structure, function and physiology of cancellous bone.

Learn more about Trabecular Metal Technology at tmt.zimmer.com.

Trabecular Metal has a coefficient of friction of .98 against cancellous bone. This produces a good “scratch fit” and increases the material’s initial fixation and stability to bone. Good initial fixation secures the implant in place, allowing time for bone ingrowth.

Trabecular Metal Material has more than 10 years of clinical results and has been used in over 200,000 orthopedic cases worldwide.

Device Description

The TM Ardis implant is a single device manufactured wholly from Trabecular Metal™ (porous tantalum) material, a highly porous, three-dimensional biomaterial designed for biologic fixation.  The TM Ardis implant is a convex, straight TLIF or PLIF device for interbody fusion of the anterior column of the spine. TM Ardis is designed for fusion at one or two contiguous levels in the lumbosacral region (L2-S1). The superior and inferior surfaces of the device are textured and convex to provide increased stability. The device also has two slots on the posterior end of the device to mate with the insertion instrument. The height is measured at the device’s tallest point.

These implants are intended for single use only and must not be reused under any circumstances.

The TM Ardis system contains implants, offered in a variety of cross-sectional geometries and sizes to accommodate different patient anatomy and physician preference, and instrumentation for insertion and neural element protection. Additionally, the TM Ardis System utilizes the Ardis Instrumentation System for site preparation and trailing. The Ardis instrumentation system (refer to 07.01471.001 for instructions for use) is comprised of instruments and perforated instrument cases that are generally comprised of aluminum, stainless steel, and/or polymeric materials. The instrument cases may be multi-layered with various trays, holders and silicone mats to hold surgical instrumentation in place during handling and storage.

The perforated instrument cases allow sterilization of the contents to occur in an FDA cleared steam autoclave utilizing a sterilization cycle that has been validated by the user for equipment and procedures employed at the user facility. Instrument cases do not provide a sterile barrier and must be used in conjunction with an FDA cleared sterilization wrap to maintain sterility.

Indications

The TM Ardis Interbody System is indicated for use as an intervertebral body fusion device at one or two contiguous levels in the lumbosacral region (L2- S1) in the treatment of degenerative disc disease (DDD) with up to Grade 1 spondylolisthesis or retrolisthesis at the involved level(s). DDD is defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies. Patients with previous non-fusion spinal surgery at involved level may be treated with the device. Patients should be skeletally mature and have had six months of non-operative treatment. The TM Ardis Interbody System is implanted using a posterior or transforaminal approach and is intended to be used singly or in pairs with supplemental fixation.

Contraindications

  1. Active local infection in or near the operative region.
  2. Active systemic infection and/or disease.
  3. Severe osteoporosis or insufficient bone density, which in the medical opinion of the physician precludes surgery or contraindicates instrumentation.
  4. Known or suspected sensitivity to the implant materials.
  5. Endocrine or metabolic disorders known to affect osteogenesis (e.g., Paget’s disease, renal osteodystrophy, hypothyroidism).
  6. Systemic disease that requires the chronic administration of nonsteroidal anti-inflammatory or steroidal drugs.
  7. Significant mental disorder or condition that could compromise the patient’s ability to remember and comply with preoperative and postoperative instructions (e.g., current treatment for a psychiatric/psychosocial disorder, senile dementia, Alzheimer’s disease, traumatic head injury).
  8. Neuromuscular disorder that would engender unacceptable risk of instability, implant fixation failure, or complications in postoperative care. Neuromuscular disorders include spina bifida, cerebral palsy, and multiple sclerosis.
  9. Pregnancy.
  10. Patients unwilling to follow postoperative instructions.
  11. Morbid obesity.
  12. Conditions other than those indicated.
  13. Prior surgical procedure using the desired operative approach.
  14. Current metastatic tumors of the vertebrae adjacent to the implant.
  15. Symptomatic cardiac disease.
  16. Skeletal immaturity.
  17. Grossly distorted anatomy.
  18. Prior fusion at the level(s) to be treated.

Warnings:

  1. Surgery is not always successful. Preoperative symptoms may not be relieved or may worsen. Surgical knowledge of the procedure and the device are important, as is patient selection. Patient compliance is also important. Tobacco and alcohol abuse may lead to unsuccessful results.
  2. Reuse of a single use device that has come in contact with blood, bone, tissue or other body fluids may lead to patient or user injury. Possible risks associated with reuse of a single use device include, but are not limited to, mechanical failure and transmission of infectious agents.
  3. Appropriate device selection is crucial to obtain proper fit and to decrease the stress placed on the implant.
  4. Components of competitive spinal systems should not be used with the TM Ardis device.
  5. Delayed healing can lead to fracture or breakage of the implants due to increased stress and material fatigue. Patients must be fully informed of all the risks associated with the implant and the importance of following postoperative instructions regarding weight bearing and activity levels to facilitate proper bone growth and healing.
  6. Implants must not be modified or otherwise processed in any way.
  7. Care must be taken to avoid using dissimilar metals in contact with one another, as corrosion may occur. Additional fixation instrumentation that is used to stabilize the affected level must be made of compatible materials, such as titanium or titanium alloy. Corrosion may accelerate metal fatigue and lead to failure of the implant.
  8. The implant must be handled carefully following the manufacturer’s instructions to prevent damage to the implant.
  9. Once a device has been implanted, it must never be reused. If the package is damaged or opened but the device is not used, or if the expiration date has passed, the device must be returned to Zimmer. The device must not be resterilized by the end user.
  10. The surgeon must be familiar with the appropriate technique to implant the supplemental internal fixation and the appropriate hardware.
  11. Results may be worse with multilevel disease. Supplemental fixation is required. The surgeon should be familiar with fixation techniques and appropriate hardware. Only supplemental fixation made of titanium or titanium alloy should be used with Trabecular Metal devices.
  12. MRI Compatibility
    1. The patient must be told that implants can affect the results of computer tomography (CT) or magnetic resonance imaging (MRI) scans.
    2. The TM Ardis Device has not been evaluated for safety or compatibility in the MR environment.
    3. 6.12.3 The TM Ardis Device has not been tested for heating or migration in the MR environment.
    4. 6.13 Patients with previous spinal surgery at the level(s) to be treated may have different clinical outcomes compared to those without a previous surgery.

Precautions

Surgeon Precautions:

  1. The implantation of an intervertebral body fusion device should be performed only by experienced spinal surgeons with specific training in the use of this device because this is a technically demanding procedure presenting a risk of serious injury to the patient.
  2. The surgeon must have a thorough knowledge of the mechanical and material limitations of surgical implants made of Trabecular Metal and be thoroughly familiar with the surgical technique for implanting the TM Ardis device for the given Indications for Use.
  3. Based on fatigue testing results, the physician/surgeon should consider the level of implantation, patient weight, patient activity level, other patient conditions, etc. which may impact on the performance of the system.
  4. The surgeon should be familiar with the various devices and instruments and verify that all are available before beginning the surgery. Additionally, the packaging and implant should be inspected for damage prior to implantation.
  5. In the event that removal of the implant is considered (e.g. due to loosening, fracture, corrosion or migration of the implant; infection; increased pain, etc.), the risks versus benefits should be carefully weighed. Such events can occur even after healing, especially in more active patients. Appropriate postoperative care must be given following implant removal to avoid further complication.
  6. The surgeon must be thoroughly familiar with the options for supplemental internal fixation systems and the associated surgical techniques.
  7. Implants must be fully seated within the inserter prior to use. Care must be taken not to over-tighten the implant-inserter assembly. Additionally, care must be taken not to manipulate the inserter implant interface in a way not recommended by the surgical technique.
  8. The surgeon must ensure that the implant is properly seated prior to closing of the soft tissue.
  9. Extreme caution must be used around the spinal cord, nerve roots and blood vessels.

 

Patient Precautions:

  1. Postoperative care instructions are extremely important and must be followed carefully.  Non-compliance with postoperative care instructions could lead to failure of the device and the possibility of additional surgery to remove the device.
  2. The patient should limit activities that result heavy lifting until a physician determines solid bony fusion is achieved.
  3. An orthotic brace may be worn following surgery for support. The attending physician, based upon each patient’s clinical progress, will determine whether a brace is appropriate and, if necessary, the length of time the brace is prescribed.
  4. Non-steroidal anti-inflammatory and steroidal drugs should be avoided for at least 45 days, or as directed by a physician, postoperatively.

Possible Adverse Effects

As with any surgical procedure, certain complications may result.

  1. Potential complications associated with the device itself include: Bone lysis associated with particulate metal debris, Device bending, Device fracture, Device loosening, Device migration. 
  2. Possible other Adverse Effects associated with use of the TM Ardis device include:
    • Abscess, Adjacent segment disease, Adverse reaction to anesthesia, Allergic reactions to prophylactic antibiotics or blood transfusions, Allergic reaction to the implant(s), Anesthetic or post-anesthetic reactions, Anterior longitudinal ligament penetration, Arachnoiditis, Arrhythmia, Atelectasis, Back pain, Bladder dysfunction, Bone or vertebral fracture during insertion of the device, Bone lysis associated with particulate metal debris from the supplemental internal fixation, Bone resorption, Bursitis, Cauda equina syndrome, Cellulitis, Cerebrovascular accident, Constipation, Cord injury, Death, Decreased leg strength,  Decreased reflexes, Deep vein thrombosis, Delayed union or nonunion, Disc herniation, Donor site events (if additional donor site is necessary), Dural tear, leak, Failure of instrumentation, Foot drop,  Fracture of pedicle bone, Graft failure (fracture, resorption, etc.), Graft expulsion, Great vessel damage, Hematoma, Hemorrhage, Ileus, Incisional hernia, Incisional pain, Infection throughout the body (systemic), Infection of the wound, Ischemia, Leg pain, Loss of spinal curvature, Loss of reduction, Malpositioned screws, Myocardial infarction, Neurapraxia, Nerve root injury, Organ, nerve, blood vessel or muscle damage, Osteoporosis local to implant site, Pain, Painful hardware, Paralysis, Screw loosening, Screw migration, Pneumonia, Pseudarthrosis, Pulmonary embolism, Radiculopathy, Recurrent deformity, Reflex sympathetic dystrophy (RSD), Scar formation, Seroma, Spinal stenosis, Spondylolisthesis, Subsidence of the implant, Swelling, Syringomyelia, Thromboembolism, Thrombophlebitis, Thrombosis, Tumor formation and/or recurrence, Urinary tract infection, Wound dehiscence.
  3. Complications which may be associated with thoracotomy include:
    • Acute respiratory distress syndrome, Atelectasis,  Pneumothorax, Pulmonary contusion, Upper respiratory tract infection.
  4. Additional complications that are not anticipated may also occur.
  5. Reoperation may be necessary to correct adverse effects.