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REDAPT

Revision Acetabular System Fully Porous Cup

REDAPT Acetabular Cup

Overview

The REDAPT acetabular cup is made using CONCELOC technology. 

 

  • Use in revision cases where compromised bone makes implant fixation and stability more difficult.
  • Allows ingrowth, an additive, or 3D, manufacturing process is used to produce an entirely porous implant that is designed to mimic the structure of cancellous bone.
  • Combines the fully porous titanium structure (CONCELOC Advanced Porous Titanium) and new variable-angle locking screws which helps to enhance implant stability and minimize micromotion after surgery.

 

Successful fixation of a porous implant requires that the implant remains in steady, stationary contact with the bone as it heals and new bone grows. For this reason, the new REDAPT Fully Porous Cup also uses the new REDAPT Variable Angle Locking Screws, which work within the implant’s unique geometry to provide a rigid construct to the acetabular cup. Traditional, non -locking screws can also be used with the REDAPT Fully Porous Cup.

Design and Technology

CONCELOC Advanced Porous Titanium

  • Customized, patent pending porous structure technology
  • Material composition: Titanium Alloy (Ti-6Al-4V)
  • Porosity: Up to 80%
  • Pore size: 202μm to 934μm

Design flexibility

Additive manufacturing (AM), commonly referred to as 3D printing, is a novel manufacturing method that involves the use of a laser or electron beam, for example, to sinter polymer or metal powders into a solid part that is built layer-by-layer. This unique fabrication method provides greater design flexibility compared to standard, subtractive manufacturing, i.e., machining. AM has also enabled Smith & Nephew to develop this custom porous structure for biological fixation combined with complex device geometries that would be difficult, expensive or impossible to attain through conventional fabrication methods. This design flexibility was leveraged to produce a roughened texture that is mapped onto the bone-interfacing surfaces of the virtual models to provide friction for enhanced initial stability. Furthermore, solid reinforcements can be added as an integral part of the porous structure where desired since both solid and porous features are fabricated layer-by-layer at the same time.

Indications

The REDAPT◊ Porous Acetabular Shell and Cemented Liner Indications

Hip components are indicated for individuals undergoing primary and revision surgery where other treatments or devices have failed in rehabilitating hips damaged as a result of trauma or non-inflammatory degenerative joint disease (NIDJD) or any of its composite diagnoses of osteoarthritis, avascular necrosis, traumatic arthritis, slipped capital epiphysis, fused hip, fracture of the pelvis and diastrophic variant.

Hip components are also indicated for inflammatory degenerative joint disease including rheumatoid arthritis, arthritis secondary to a variety of diseases and anomalies, and congenital dysplasia; treatments of nonunion, femoral neck fracture and trochanteric fractures of the proximal femur with head involvement that are unmanageable using other techniques; endoprosthesis, femoral osteotomy, or Girdlestone resection; fracture-dislocation of the hip; and correction of deformity.

The REDAPT Porous Acetabular Shell is intended for single use only and is to be implanted without bone cement.

The REDAPT Cemented Liner is intended for single use only and is to be implanted with bone cement.

 

Contraindications

1.Conditions that would eliminate or tend to eliminate adequate implant support or prevent the use of an appropriately-sized implant, e.g.:

               a. Blood supply limitations

               b. Insufficient quantity or quality of bone support, e.g., osteoporosis or metabolic disorders which may impair bone formation and osteomalacia

               c. Infections, osteolysis or other conditions which lead to increased bone resorption

2. Mental or neurological conditions which tend to impair the patient’s ability or willingness to restrict activities

3. Physical conditions or activities which tend to place extreme loads on implants, e.g., Charcot joints, muscle deficiencies, multiple joint disabilities, etc.

4. Skeletal immaturity

5. The alumina ceramic liner is contraindicated for use with any product other than the metal shell with the correlating inner taper geometry and the appropriate sized alumina ceramic head. The alumina ceramic liner should only be used with the alumina ceramic head. In the US, refer to the separate package insert provided with the ceramic acetabular liners.

6. In revision surgery, inadequate proximal implant support is contraindicated. The literature shows an increased risk of implant failure in revision cases where proximal support is not achieved, poor bone quality exists, and smaller sized implants are utilized. The lower the implant fixation point in the femur (distance from the head center) the greater the risk of implant fracture and/or re-revision.

7. Morbid obesity.

Contraindications may be relative or absolute and must be carefully weighed against the patient’s entire evaluation and the prognosis for possible alternative procedures such as non-operative treatment, arthrodesis, femoral osteotomy, pelvic osteotomy, resection arthroplasty, hemiarthroplasty and others.