Inclusion Criteria:  All patients that underwent to partial or total hip arthroplasty and implanted with SL cementless stem between Jan 2012 and Jan 2020 at Nemocnice Kyjov Hospital (CZ) in accordance with the indication for use of the product and site standard of practice. Patients' radiographs availability of at least 4 of the 6 visits (mandatory baseline radiographs). Patient is willing and able to complete additional follow-up evaluations if needed after signing ICF;  Exclusion Criteria:  Age < 18 years; Female patients who are pregnant, nursing, or planning a pregnancy