An implant assembly for use in tissue repair, the implant assembly having an adjustable length and comprising: a fixation device comprising a bone facing surface, an outer surface opposite the bone facing surface, a first aperture extending through the fixation device from the outer surface to the bone facing surface, and at least a second aperture extending through the fixation device from the outer surface to the bone facing surface; a flexible elongate element secured to the fixation device, the flexible elongate element having a first free end and a second free end, in which the flexible elongate element passes through apertures of the fixation device so that: at least two bone-side loops (28, 30) are formed which each extend from at least one of the apertures at the bone facing surface of the fixation device, at least one of the bone-side loops forming a support loop adapted to be located at least partly within a bone tunnel; at least one fixation loop is formed which extends from one of the apertures at the outer surface of the fixation device to another one of the apertures at the outer surface of the fixation device; and an adjustable knot arrangement is formed, comprising the fixation loop and an adjustable knot, which is separate from the fixation loop; the adjustable knot being positionable on the outer surface of the fixation device, between the outer surface of the fixation device and the fixation loop; a first leg extending from the knot to the first free end of the elongate element and a second leg extending from the knot to the second free end of the elongate element; in which the flexible elongate element is securable to the fixation device by the fixation loop, the fixation loop extending from said one of the apertures and passing over at least part of the adjustable knot arrangement to said another one of the apertures, to clamp the knot arrangement to the fixation device, between the outer surface of the fixation device and the fixation loop, when the bone-side loops are tensioned relative to the fixation device; so as to allow a length of each of the bone-side loops to be adjusted. a fixation device comprising a bone facing surface, an outer surface opposite the bone facing surface, a first aperture extending through the fixation device from the outer surface to the bone facing surface, and at least a second aperture extending through the fixation device from the outer surface to the bone facing surface; a flexible elongate element secured to the fixation device, the flexible elongate element having a first free end and a second free end, in which the flexible elongate element passes through apertures of the fixation device so that: at least two bone-side loops (28, 30) are formed which each extend from at least one of the apertures at the bone facing surface of the fixation device, at least one of the bone-side loops forming a support loop adapted to be located at least partly within a bone tunnel; at least one fixation loop is formed which extends from one of the apertures at the outer surface of the fixation device to another one of the apertures at the outer surface of the fixation device; and an adjustable knot arrangement is formed, comprising the fixation loop and an adjustable knot, which is separate from the fixation loop; the adjustable knot being positionable on the outer surface of the fixation device, between the outer surface of the fixation device and the fixation loop; a first leg extending from the knot to the first free end of the elongate element and a second leg extending from the knot to the second free end of the elongate element; in which the flexible elongate element is securable to the fixation device by the fixation loop, the fixation loop extending from said one of the apertures and passing over at least part of the adjustable knot arrangement to said another one of the apertures, to clamp the knot arrangement to the fixation device, between the outer surface of the fixation device and the fixation loop, when the bone-side loops are tensioned relative to the fixation device; so as to allow a length of each of the bone-side loops to be adjusted. at least two bone-side loops (28, 30) are formed which each extend from at least one of the apertures at the bone facing surface of the fixation device, at least one of the bone-side loops forming a support loop adapted to be located at least partly within a bone tunnel; at least one fixation loop is formed which extends from one of the apertures at the outer surface of the fixation device to another one of the apertures at the outer surface of the fixation device; and an adjustable knot arrangement is formed, comprising the fixation loop and an adjustable knot, which is separate from the fixation loop; the adjustable knot being positionable on the outer surface of the fixation device, between the outer surface of the fixation device and the fixation loop; a first leg extending from the knot to the first free end of the elongate element and a second leg extending from the knot to the second free end of the elongate element; in which the flexible elongate element is securable to the fixation device by the fixation loop, the fixation loop extending from said one of the apertures and passing over at least part of the adjustable knot arrangement to said another one of the apertures, to clamp the knot arrangement to the fixation device, between the outer surface of the fixation device and the fixation loop, when the bone-side loops are tensioned relative to the fixation device; so as to allow a length of each of the bone-side loops to be adjusted.