An open wedge implant for open wedge osteotomies, comprising: a wedge body comprising a thermoplastic polymer material and a first expandable portion and a second expandable portion connected together by way of an intervening distal attachment, the wedge body configured such that a cross-section at a proximal end is larger than at a distal end and a proximal opening; the first and second expandable portions respectively comprise a first face and a second face comprising roughened exterior surfaces, the roughened exterior surfaces spanning the entire first and second faces configured for contacting bone portions exposed during osteotomy, such that the roughened exterior surfaces comprise a titanium plasma spray coating applied to a polyetheretherketone (PEEK), or polyetherketoneketone (PEKK) substrate; an expander configured to separate the first and second expandable portions (124, 128) so as to increase a proximal thickness and a wedge angle of the wedge body, the distal end comprising a flat portion configured to contact a distal surface of the proximal opening, wherein the proximal opening comprises: a first bevel in the first expandable portion and a second bevel in the second expandable portion which are configured to contact a first taper and a second taper in the expander; wherein a rounded proximal surface of the expander comprises a curvature which is identical to a curvature of the proximal end of the wedge body; a distal channel configured to facilitate deflection of the first and second expandable portions, such that a uniform wedge angle is maintained along a longitudinal dimension of the wedge implant; a proximal screw configured to move the expander within the wedge body, whereby a wedge angle of the open wedge implant is adjustable by way of turning the proximal screw. a wedge body comprising a thermoplastic polymer material and a first expandable portion and a second expandable portion connected together by way of an intervening distal attachment, the wedge body configured such that a cross-section at a proximal end is larger than at a distal end and a proximal opening; the first and second expandable portions respectively comprise a first face and a second face comprising roughened exterior surfaces, the roughened exterior surfaces spanning the entire first and second faces configured for contacting bone portions exposed during osteotomy, such that the roughened exterior surfaces comprise a titanium plasma spray coating applied to a polyetheretherketone (PEEK), or polyetherketoneketone (PEKK) substrate; an expander configured to separate the first and second expandable portions (124, 128) so as to increase a proximal thickness and a wedge angle of the wedge body, the distal end comprising a flat portion configured to contact a distal surface of the proximal opening, wherein the proximal opening comprises: a first bevel in the first expandable portion and a second bevel in the second expandable portion which are configured to contact a first taper and a second taper in the expander; wherein a rounded proximal surface of the expander comprises a curvature which is identical to a curvature of the proximal end of the wedge body; a distal channel configured to facilitate deflection of the first and second expandable portions, such that a uniform wedge angle is maintained along a longitudinal dimension of the wedge implant; a proximal screw configured to move the expander within the wedge body, whereby a wedge angle of the open wedge implant is adjustable by way of turning the proximal screw. a first bevel in the first expandable portion and a second bevel in the second expandable portion which are configured to contact a first taper and a second taper in the expander; wherein a rounded proximal surface of the expander comprises a curvature which is identical to a curvature of the proximal end of the wedge body; a distal channel configured to facilitate deflection of the first and second expandable portions, such that a uniform wedge angle is maintained along a longitudinal dimension of the wedge implant; a proximal screw configured to move the expander within the wedge body, whereby a wedge angle of the open wedge implant is adjustable by way of turning the proximal screw.