The effect of implant design on patient outcomes following total knee replacement

Comparison of outcome in Total Knee Replacement (TKR) using a new design 'single-raduis-of-curvature' implant (TRIathlon) versus a traditional design 'multi-raduis' implant (KineMAX)

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN85418379

Enrollment

204

Registered

2012-04-11

Start date

2008-02-25

Completion date

Unknown

Last updated

2017-11-27

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Osteoarthritis / total knee arthroplasty Musculoskeletal Diseases Gonarthrosis [arthrosis of knee]

Interventions

Primary total knee arthroplasty - Patients randomised to either Triathlon or Kinemax implants

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1. Diagnosis of osteoarthritis 2. Planned primary total knee arthroplasty with standard implants 3. Capacity to give informed consent

Exclusion criteria

Exclusion criteria: 1. Inability to fulfill the inclusion criteria 2. Comorbidities that would affect post operative recovery or subsequent physical performance

Design outcomes

Primary

Measure	Time frame
1. Change in Oxford Knee Score 2. Lower limb extensor mechanism power output (Leg Extensor Power Rig) Measured pre-op, 6 weeks, 6 months, 12 months, 3 years and 5 years	—

Secondary

Measure	Time frame
1. Knee range of movement (flexion/extension) 2. Battery of timed functional performance tests (timed up-and-go, stairs climb, 8 metre walk) 3. Pain scores (0-10 numerical rating scale) 4. Western Ontario and McMaster Universities (WOMAC) Osteoarthritis Index Measured pre-op, 6 weeks, 6 months, 12 months, 3 years and 5 years	—

Countries

United Kingdom

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026