{"doi":"10.1302/3114-210535","title":"Survivorship of Fixed vs Mobile Bearing Unicompartmental Knee Replacement: A Systematic Review and Meta-Analysis of Sixty-Four Studies and National Joint Registries","abstract":"Background: Unicompartmental knee replacement (UKR) prostheses can use fixed (FB) or mobile bearing (MB) constructs.We compared survivorship and failure modes of both designs. Methods:The inclusion criteria were studies published between 2005-2020 with minimum average follow-up of 5 years reporting the survival and/or number of revisions of specific designs in medial and lateral UKR.Pooled rate of revision per 100 patient years (PTIR) was estimated using a random effects model. Results: 70 cohorts of 17 405 UKRs with weighted mean follow-up of 7.3 years (0.1-29.4 years) were included.A total of 170 923 UKRs were identified in registry reports at a weighted mean implant survival time of 15.4 years.PTIR in MB UKR versus FB UKR was similar [1.45 Vs 1.40, (p = 0.8)].In cohort studies, the overall PTIR for MB was also similar to FB [1.03 Vs 0.78, (p= 0.1)].For medial UKR, the PTIR for MB was marginally greater but not significantly different to FB [0.96 Vs 0.81, (p= 0.3)], whilst for lateral UKR, the PTIR for MB was significantly worse than for FB [(2.20 Vs 0.72, (p<0.01)].Polyethylene wear is more common in FB implants, whilst MB implants are revised more often for bearing dislocation. Conclusion:Overall implant survival in mid-to long-term studies is similar for MB versus FB medial UKR.MB have a four-fold higher risk of revision in comparison to FB when used for lateral UKR.","journal":"OrthoMedia","year":2021,"id":229179,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":0,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9434,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2021-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[],"reference_count":33,"raw_metadata":null,"created_at":"2026-07-18T23:54:57.922333Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}