An orthopedic device, comprising: a frame including first upper and lower frame components (106, 108); a first strut assembly permanently secured to said first upper and lower frame components (106, 108) and connecting them via a first hinge; a second strut assembly detachably connected to said first upper and lower frame components (106, 108), the second strut assembly carrying second upper and lower frame components (112, 114) and connecting them via a second hinge; upper and lower suspension straps (120, 122) connecting to opposed sides of the first upper and lower frame components (106, 108) respectively, wherein the second strut assembly detachably secures to the upper and lower suspension straps (120, 122), each of the second upper and lower frame components (112, 114) defining a pair of slots (139, 141) through which the respective upper or lower suspension strap (120, 122) extends; characterized in that each of the second upper and lower frame components (112, 114) includes a fastener element directly securable to the respective upper or lower suspension strap (120, 122), wherein each of the upper and lower suspension straps (120, 122) includes a plurality of holes along at least a portion of the length of the strap and sized and configured for receiving the respective fastener element, each fastener element comprising a flange arranged for securing to the respective upper or lower suspension strap (120, 122) and preventing slippage of said upper or lower suspension strap (120, 122) from the respective second upper or lower frame components (112, 114) once the fastener element is received in one of the plurality of holes of the strap, each flange extending at least over a portion of the respective upper and lower suspension strap (120, 122) at said one of the plurality of holes to which the strap (120, 122) is secured. a frame including first upper and lower frame components (106, 108); a first strut assembly permanently secured to said first upper and lower frame components (106, 108) and connecting them via a first hinge; a second strut assembly detachably connected to said first upper and lower frame components (106, 108), the second strut assembly carrying second upper and lower frame components (112, 114) and connecting them via a second hinge; upper and lower suspension straps (120, 122) connecting to opposed sides of the first upper and lower frame components (106, 108) respectively, wherein the second strut assembly detachably secures to the upper and lower suspension straps (120, 122), each of the second upper and lower frame components (112, 114) defining a pair of slots (139, 141) through which the respective upper or lower suspension strap (120, 122) extends; characterized in that each of the second upper and lower frame components (112, 114) includes a fastener element directly securable to the respective upper or lower suspension strap (120, 122), wherein each of the upper and lower suspension straps (120, 122) includes a plurality of holes along at least a portion of the length of the strap and sized and configured for receiving the respective fastener element, each fastener element comprising a flange arranged for securing to the respective upper or lower suspension strap (120, 122) and preventing slippage of said upper or lower suspension strap (120, 122) from the respective second upper or lower frame components (112, 114) once the fastener element is received in one of the plurality of holes of the strap, each flange extending at least over a portion of the respective upper and lower suspension strap (120, 122) at said one of the plurality of holes to which the strap (120, 122) is secured.