An expansion anchor (110, 210, 310, 510) comprising: a tubular sleeve having a longitudinal axis and comprising an expansion portion (122, 222, 322) at a distal end and a body portion at a proximal end and expansion tabs (124, 524) attached to said body portion and extending towards said distal end; a tightening screw (128, 230, 430) configured to move said expansion portion along said longitudinal axis inside said expansion tabs so as to expand said tabs radially outwardly relative to said longitudinal axis; and at least one deformable leg (126, 226, 326, 426, 526) extending between and attached to said body portion and to said expansion portion of said tubular sleeve, said deformable leg comprising at least two coupled segments, a distal segment (126a, 326a, 526a), having a first attachment portion (127a, 327a, 427a) linking said distal segment to said expansion portion and a proximal segment (126b, 526b), having a second attachment portion linking said proximal segment to said body portion the width of said proximal segment increasing towards said proximal end of said tubular sleeve, characterised in that that said at least one deformable leg (126, 226, 326, 426, 526) comprises an outwardly facing line of weakening (136a, 236a, 336b, 536a) provided between said first attachment portion (127a, 327a, 427a) and said distal segment (126a, 326a, 526a), and in that said first attachment portion (127a, 327a, 427a) further comprises a recess, arranged so as to continue from said line of weakening (136a, 236a, 336b, 536a) and separating a portion of said distal segment (126a, 326a, 526a) from said expansion portion (122, 222, 322), and a ramped surface, configured to guidingly move said portion of said distal segment (126a, 326a, 526a) away from said longitudinal axis, during use. a tubular sleeve having a longitudinal axis and comprising an expansion portion (122, 222, 322) at a distal end and a body portion at a proximal end and expansion tabs (124, 524) attached to said body portion and extending towards said distal end; a tightening screw (128, 230, 430) configured to move said expansion portion along said longitudinal axis inside said expansion tabs so as to expand said tabs radially outwardly relative to said longitudinal axis; and at least one deformable leg (126, 226, 326, 426, 526) extending between and attached to said body portion and to said expansion portion of said tubular sleeve, said deformable leg comprising at least two coupled segments, a distal segment (126a, 326a, 526a), having a first attachment portion (127a, 327a, 427a) linking said distal segment to said expansion portion and a proximal segment (126b, 526b), having a second attachment portion linking said proximal segment to said body portion the width of said proximal segment increasing towards said proximal end of said tubular sleeve, characterised in that that said at least one deformable leg (126, 226, 326, 426, 526) comprises an outwardly facing line of weakening (136a, 236a, 336b, 536a) provided between said first attachment portion (127a, 327a, 427a) and said distal segment (126a, 326a, 526a), and in that said first attachment portion (127a, 327a, 427a) further comprises a recess, arranged so as to continue from said line of weakening (136a, 236a, 336b, 536a) and separating a portion of said distal segment (126a, 326a, 526a) from said expansion portion (122, 222, 322), and a ramped surface, configured to guidingly move said portion of said distal segment (126a, 326a, 526a) away from said longitudinal axis, during use.