expert adolescent lateral fem nail pfna proximal fem nail expert adolescent lateral fem nail expert r afn retrograde antegrade ufn unreamed fem nail cfn expert r afn retrograde antegrade anium elastic nail system synthes depuy synthes launches nailing system fem neck fracture proximal fem depuy synthes launches implant solution retrograde fem nail system surgical proximal fem nailing system tfna fem shaft fracture open fem a a simple fem shaft fracture b fixation of fem neck fractures synthes 04 003 656s lateral entry fem recon nail uses sizes depuy synthes tfn fem nail orthopediatrics pedinail lateral synthes anium fem nail standard