Table 1. The search steps.

PICO - Population, Intervention, Comparator, and Outcomes; UKR - unicompartmental knee replacement; ACL - anterior cruciate ligament; KOOS - Knee injury and Osteoarthritis Outcome Score; WOMAC - Western Ontario and McMaster Universities Osteoarthritis Index

Search number	Search terms
Search 1 (P)	"unicompartmental knee replacement" OR "UKR" OR "partial knee arthroplasty" OR "medial UKR" OR "unicondylar knee replacement"
Search 2 (I)	"Synchronous ACL reconstruction" OR "combined ACL and UKR" OR "ACL-deficient knees" OR "ACL repair with UKR" OR "simultaneous ACL and UKR"
Search 3 (C)	"UKR alone" OR "isolated UKR" OR "ACL-intact knees" OR "conventional UKR" OR "standard UKR"
Search 4 (O)	"Oxford Knee Score" OR "KOOS" OR "WOMAC" OR "patient-reported outcomes" OR "implant survival" OR "revision rate" OR "postoperative complications"
Search 5	Search 1 AND Search 2 AND Search 3 AND Search 4