Trephine biopsy versus conventional open surgical technique for bone graft harvesting from the olecranon: A retrospective comparison of perioperative outcomes - İsmail Bülent Özçelik; Berkan Mersa; Seyyid Şerif Ünsal; Tuğrul Yıldırım; Fatih Kabakaş (Acta Orthopaedica et Traumatologica Turcica, 2020)