Systematic review and meta-analysis of bearing dislocation in lateral meniscal bearing unicompartmental knee replacement: Domed versus flat tibial surface

Abstract Background Bearing dislocation is a problem following mobile bearing Oxford lateral Unicompartmental Knee Replacement (UKR). Therefore, the design of tibial component was changed from flat surface to domed with biconcave increase entrapment. This systematic review compared and revision rates two designs. Methods Two authors independently searched MEDLINE, EMBASE ISI Web Science, reference lists retrieved articles, internet. Randomised, cohort, case-control case studies adult patients knee osteoarthritis treated or UKR their outcomes were included. The overall rate annual (per 100 years) determined. Results Nine (937 knees) met inclusion criteria (3 flat, 6 domed). Four (all domed) had low risk bias five high 2 domed), so data should be interpreted caution. decreased 17% (flat) 3.7% (domed). Dislocations occurred on average at 16 months medial dislocations most common. excluding 1.1%pa 0.7%pa. PROSPERO registration: CRD42019139250. Conclusion Modifying shape increased 10 year survival 93%. still relatively stability assessed intra-operatively if unacceptable, fixed version can inserted.