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:
Unique Trabecular Metal ® Technology
The only salvage system to offer advanced Trabecular Metal Technology — The Best Thing Next to Bone ® . Key features include:
95% Condylar Loading
The Zimmer Segmental System utilizes the same kinematics as the NexGen RH Knee — 95% of the load passes through the condyles, similar to the loading pattern of a primary implant.
Transitional Articular Surface
A tapered articular surface allows for increased intraoperative options.
Strong One-Piece Hinge Post
The Segmental One-Piece Hinge Post is designed to provide strong, reliable hinge stability.
An incremental alignment mechanism features tab and pocket adjustment for optimal alignment.
Multiple Unique Stem Options
Stems are available in fluted and splined styles. The fluted styles are available in 130mm and 190mm straight stems and 250mm bowed. The splined press-fit variable stiffness stems are available in 130mm straight and 190mm bowed. Press-fit stems are splined for secure initial press fit with a variable stiffness tip designed to reduce tip stress inside the bone.
Torsional Fatigue Test
Combined Load Test
Rotating Hinge Contact Area Analysis
Segmental System Stem Test
Rotary Overhang Fatigue Test
This device is indicated for:
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.
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.