2B MEDİKAL \ Specialty \ Knees \ Segmental System

Segmental System

Product Description

The Zimmer® Segmental System is a salvage knee prosthesis intended to replace the distal femur, mid-shaft femur, proximal femur, and/or total knee in cases that require extensive resection and restoration. The Segmental System is also compatible with selected components from NexGen® Rotating Hinge Knee Systems. Using this system it is possible to totally replace the lower limb from the mid-calf to the hip. The distal femoral components are designed to be compatible with NexGen Patella Components.

The Segmental System is a modular system comprised of stem extensions, segments, intercalary segments, articular surfaces and distal femoral components. The components of the Segmental System are made from the following materials:

  • Articular surfaces: UHMWPE and Cobalt-Chromium-Molybdenum Alloy (hinge post)
  • Distal Femoral Components: Cobalt-Chromium-Molybdenum Alloy and Ti-6Al-4V Alloy (set screw)
  • Polyethylene Insert: UHMWPE
  • Segments, Intercalary Segments, and Smooth Stem Collars: Ti-6Al-4V Alloy
  • Stem Extensions: Cobalt-Chromium-Molybdenum Alloy and PMMA
  • Trabecular Metal™ Stem Collars: Tantalum
Product Brochure
Indications
This device is indicated for:
  • Moderate to severe knee instability
  • Significant bone loss and/or ligament deficiencies caused by neoplasms, trauma, rheumatoid arthritis, osteoarthritis, traumatic arthritis, polyarthritis, collagen disorders, and/or avascular necrosis of the femoral condyle
  • Valgus, varus or flexion deformities
  • The salvage of previously failed surgical attempts
A total femoral replacement construct consisting of MOST Options proximal femoral, Segmental System Segments and Segmental System Distal Femoral Components may be used without cement. Variable Stiffness stem extensions require the use of either a smooth or Trabecular Metal Stem Collar, which must be cemented to the stem. Following cementing to the stem, the smooth collar must be cemented against the bone, but the remainder of the stem must be used uncemented. Fluted stem extensions require the use of either a smooth or Trabecular Metal Stem Collar, which must be cemented to the stem. Following cementing to the stem extension, the smooth collar and the remainder of the stem must also be cemented against the bone. The Trabecular Metal collar may be used cemented or uncemented against the bone. All other constructs are for cemented use only.
Contraindications
Contraindications include:
  • Local and/or overt infection
  • Insufficient bone stock to allow secure fixation
  • Skeletal immaturity
  • Neuropathic arthropathy
  • Osteoporosis
  • A stable arthrodesis in a satisfactory functional position
Total knee arthroplasty is contraindicated in patients who have rheumatoid arthritis (RA) and an ulcer of the skin or a history of recurrent breakdown of the skin because their risk of postoperative infection is greater. The Segmental Intercalary Segment is contraindicated for use as a knee fusion device.