Bone marrow samples will be collected from patients undergoing hip arthroplasty surgery. Blood and bone marrow samples will be used for metabolic profiling and analysis of relevant CHIP mutations. Combined single-cell transcriptomics and mutation-specific single-cell genotyping (biotin-PCR using mutation-targeted primers followed by sequencing) will subsequently be performed. The gene expression profile of wildtype and mutant hematopoietic stem cells will be compared, performing both broad gene set enrichment analysis and targeted analysis of metabolic pathways.