Collared versus collarless hydroxyapatite-coated stems for primary cementless total hip arthroplasty; a systematic review of comparative studies. Is there any difference in survival, functional, and radiographic outcomes? - Giovanoulis V; Kenanidis E; Aïm F; Gamie Z; Marmor S; Potoupnis M; Lustig S; Tsiridis E (SICOT-J, 2024)