DISTAL FEMORAL GROWING PROSTHESIS, TIBIAL ROTATING COMPONENTS, BEARING, AXIS, CIRCLIP, WEDGE
Device Facts
| Record ID | K122015 |
|---|---|
| Device Name | DISTAL FEMORAL GROWING PROSTHESIS, TIBIAL ROTATING COMPONENTS, BEARING, AXIS, CIRCLIP, WEDGE |
| Applicant | Howmedica Osteonics Corp. |
| Product Code | KRO · Orthopedic |
| Decision Date | Feb 22, 2013 |
| Decision | SESE |
| Submission Type | Traditional |
| Regulation | 21 CFR 888.3510 |
| Device Class | Class 2 |
| Attributes | Therapeutic, Pediatric |
Indications for Use
The Distal Femoral Growing Prosthesis System offers a treatment option for patients requiring distal femoral replacement who have not achieved full skeletal maturity (open epiphysis). The devices are single use implants.
Device Story
Distal Femoral Growing Prosthesis System reconstructs large bone defects in skeletally immature patients; utilizes rotating hinge design; allows mechanical expansion via minimally invasive procedures to maintain leg-length equality during growth. Implanted by surgeons in clinical settings; single-use; requires bone cement. Provides structural replacement for distal femur/proximal tibia; enables ongoing adjustment to accommodate pediatric growth; benefits patients by preventing limb-length discrepancy following radical resection.
Clinical Evidence
No clinical data. Bench testing only: single-axis and multi-axis life cycle testing confirmed expansion feature stability (no collapse/retraction) under physiological loading; fatigue testing of crossover bearing component demonstrated performance comparable to predicate.
Technological Characteristics
Rotating hinge knee prosthesis; modular design; mechanical expansion mechanism. Materials, design, and sizes are similar/identical to predicates. Intended for cemented fixation. Single-use implant.
Indications for Use
Indicated for pediatric patients with open epiphysis requiring radical resection and replacement of distal femur and/or proximal tibia due to oncology, severe trauma, noninflammatory degenerative joint disease (osteoarthritis), functional deformity, rheumatoid arthritis, or revision of failed treatments. Intended for use with bone cement.
Regulatory Classification
Identification
A knee joint femorotibial metal/polymer constrained cemented prosthesis is a device intended to be implanted to replace part of a knee joint. The device limits translation or rotation in one or more planes and has components that are linked together or affined. This generic type of device includes prostheses composed of a ball-and-socket joint located between a stemmed femoral and a stemmed tibial component and a runner and track joint between each pair of femoral and tibial condyles. The ball-and-socket joint is composed of a ball at the head of a column rising from the stemmed tibial component. The ball, the column, the tibial plateau, and the stem for fixation of the tibial component are made of an alloy, such as cobalt-chromium-molybdenum. The ball of the tibial component is held within the socket of the femoral component by the femoral component's flat outer surface. The flat outer surface of the tibial component abuts both a reciprocal flat surface within the cavity of the femoral component and flanges on the femoral component designed to prevent distal displacement. The stem of the femoral component is made of an alloy, such as cobalt-chromium-molybdenum, but the socket of the component is made of ultra-high molecular weight polyethylene. The femoral component has metallic runners which align with the ultra-high molecular weight polyethylene tracks that press-fit into the metallic tibial component. The generic class also includes devices whose upper and lower components are linked with a solid bolt passing through a journal bearing of greater radius, permitting some rotation in the transverse plane, a minimal arc of abduction/adduction. This generic type of device is limited to those prostheses intended for use with bone cement (§ 888.3027).
Predicate Devices
- Expandable Knee (K020381)
- Global Modular Replacement System (GMRS) (K023087)
- Howmedica Modular Replacement System-Proximal Femur (K965164)
Reference Devices
- GMRS
- MRH
- MRS
- KRH