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Failure of Unicompartmental knee replacement bearings

Catastrophic Failure of Convex Unicompartmental Polyethylene bearings

Status
Completed
Phases
Unknown
Study type
Observational
Source
ANZCTR
Registry ID
ACTRN12619001465145
Enrollment
32
Registered
2019-10-23
Start date
2019-10-23
Completion date
2019-10-23
Last updated
2026-08-03

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

Conditions

None listed

Brief summary

This trial reports the unforeseen consequence of a novel design of a unicompartmental knee arthroplasty (UKA) that resulted in a specific mechanical and tribiological mode of failure. Convex polyethylene bearings were developed to decrease bearing dislocation and used in 32 patients with disabling medial compartment osteoarthritis of the knee. This study reports the clinical outcomes (PROMS) and revisions for failed implants,

Interventions

Observational study of patients in an institutional data base that have had a unicompartmental knee arthroplasty including a convex polyethylene bearing to ten years. Patients complete PROMS (see section 4) as routine care at pre op, 6 weeks, 6 month, 12, 24, 60 and 120 months. Radiology at pre op, immediately post op, 12, 24, 60 and 120 months post op.

Sponsors

David Campbell
Lead SponsorIndividual

Eligibility

Sex/Gender
All
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

All patients having a BalanSys unicompartmental knee arthroplasty including a convex polyethylene bearing

Exclusion criteria

none

Outcome results

None listed

Source: ANZCTR · Data processed: Aug 9, 2026