Taylor Spatial Frame

The Taylor Spatial Frame is a multiplanar circular external fixator [9]. It combines ease of application and computer accuracy in reducing fractures or nonunions and in correcting deformities. The basic unit consists of two full rings that are connected by six diagonally oriented, adjustable struts. The struts are connected to each ring by universal joints. Fixation to the bone is

Fig. 6. Management of a tibial nonunion by means of the Fischer device, developed at Minnesota State University
Fig. 7. Fischer apparatus applied to a leg with a tibial delayed union

achieved with transosseous wires, half-pins, or a combination of the two. Additional stability can be achieved by adding a second ring above or below the site of the lesion.

The device is modular and offers the possibility of using full rings, halfrings, or 2/3 rings of various diameters, and different strut lengths are available (Fig. 8).

The accuracy of displacement or deformity correction by this device is dependent on analysis of the radiograms. Thirteen parameters describing the fixator, displacement or deformity, and position of the fixator to the bone are entered into a computer, and a computer program provides the proper adjustments of the six modular struts needed to obtain reduction or correction.

Adjusting the struts changes the orientation of one ring to the other, and this results in a spatial change of one bone fragment to the other one. Adjustments during the postoperative period are also possible by changing the strut length and can be done by the patient, according to a special schedule, which is also generated by the software [10,11].

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