PROSIM Knee Joint Wear Simulator
| Brand | PROSIM |
|---|---|
| Origin | United Kingdom |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | 1 |
| Quotation | Upon Request |
| Instrument Type | Multiaxial Orthopedic Fatigue Tester |
| Maximum Test Load | 5 kN |
| Frequency Range | >2.0 Hz |
| Machine Weight | 400 kg |
Overview
The PROSIM Knee Joint Wear Simulator is an advanced, multiaxial orthopedic fatigue testing system engineered for high-fidelity simulation of in vivo kinematic and kinetic conditions experienced by total knee arthroplasty (TKA) implants. Unlike conventional uniaxial or biaxial testers, this simulator employs a true six-degree-of-freedom (6-DOF) motion architecture per station—comprising flexion/extension, anterior/posterior translation, internal/external tibial rotation, medial/lateral displacement, and axial loading—to replicate physiologically relevant joint articulation. Its core operating principle is closed-loop servo-hydraulic or electromechanical actuation (configurable per customer specification), synchronized with real-time force and position feedback to ensure strict adherence to prescribed waveforms defined by ISO 14243-1:2009 and ISO 14243-3:2004. Designed in collaboration with Biomet (now part of Zimmer Biomet), the system enables rigorous wear assessment under dynamic, load-controlled immersion conditions—critical for preclinical validation of bearing materials, implant geometry, and surface treatments.
Key Features
- Modular multi-station architecture: Configurable as single-group (up to 6 stations) or dual-group (e.g., 2 × 3 stations) layouts for parallel testing scalability
- Per-station 5-axis independent actuation: Flexion/extension (±90°), anterior/posterior translation (±15 mm), internal/external tibial rotation (±30°), medial/lateral displacement (±10 mm), and axial loading (up to 5 kN)
- Integrated 6-axis load cell per station for simultaneous measurement of Fx, Fy, Fz, Mx, My, Mz under physiological loading
- Physiological temperature control: Immersion bath maintained at 37 °C ± 2 °C using PID-regulated heating and circulation systems
- Real-time waveform fidelity: Electromechanical drive train with integrated gearmotor and high-resolution encoders ensures <1% tracking error across complex gait cycles (walking, jogging, intermittent running)
- Soft-tissue emulation: Integrated linear spring-damper modules simulate ligamentous constraint and joint capsule resistance
- Deep-flexion capability: Full range of motion supports ≥135° flexion angles required for evaluating high-flex posterior-stabilized designs
Sample Compatibility & Compliance
The PROSIM Knee Joint Wear Simulator accommodates standard-size TKA components—including cruciate-retaining (CR), posterior-stabilized (PS), bicruciate-retaining (BCR), and mobile-bearing configurations—mounted on anatomically accurate surrogate femoral and tibial substrates. All test protocols comply with ISO 14243-1:2009 (general requirements) and ISO 14243-3:2004 (wear testing methodology), supporting regulatory submissions under FDA 21 CFR Part 820 and ISO 13485. The system’s mechanical architecture and software audit trail meet GLP/GMP-aligned data integrity standards, including timestamped raw data logging, user-access controls, and electronic signature support per 21 CFR Part 11 where configured. Optional calibration certificates traceable to UKAS-accredited standards are available upon request.
Software & Data Management
Control and analysis are executed via a native Windows-based application built on deterministic real-time OS extensions. The interface provides intuitive waveform programming (import/export of .csv or .mat files), cycle-by-cycle parameter adjustment, and synchronized multi-channel acquisition at up to 1 kHz sampling rate. All position, load, torque, and temperature data are stored in vendor-neutral HDF5 format with embedded metadata (test ID, operator, date/time, calibration status). Built-in reporting tools generate ISO-compliant wear volume summaries (mm³/million cycles), coefficient-of-friction trends, and kinematic deviation heatmaps. Data export supports integration with MATLAB, Python (via h5py), and LIMS platforms through standardized API endpoints.
Applications
- Preclinical wear screening of UHMWPE, highly crosslinked polyethylene, and alternative bearing surfaces (e.g., vitamin E-diffused, ceramic-on-polyethylene)
- Comparative evaluation of implant design variants—tibial tray geometry, patellar button curvature, and constraint level—under clinically representative loading sequences
- Long-term fatigue validation of cementless fixation interfaces and porous coating adhesion strength
- Development and verification of computational models (FEA, multibody dynamics) requiring experimental boundary condition validation
- Supporting ISO 14243-compliant wear testing for CE marking, FDA 510(k), and PMA dossiers
FAQ
Does the system support custom gait cycles beyond standard walking and jogging profiles?
Yes—users may import proprietary kinematic datasets or define piecewise-continuous waveforms using time-position-force tables.
Is the immersion bath compatible with bovine serum or other protein-containing lubricants?
Yes; stainless-steel and PTFE-wetted components ensure chemical compatibility with 25–30% v/v bovine serum solutions and standard phosphate-buffered saline (PBS).
Can individual stations operate with different test protocols simultaneously?
Yes; each station runs fully autonomous control loops, enabling heterogeneous test conditions across the same platform.
What maintenance intervals are recommended for electromechanical actuators?
Routine inspection every 500 operational hours; gearmotor lubrication and encoder calibration annually or per 10,000 cycles, whichever occurs first.
Is remote monitoring and diagnostics supported?
Yes—optional Ethernet/IP connectivity enables secure remote access for real-time status viewing, alarm notification, and firmware updates under IT-managed network policies.
