SK™ Range of Motion (ROM™) Hinges
A recent development in transarticular external fixation (TESF) is the release of two sizes of a range of motion (ROM™) hinge. These hinges combine an adjustable joint angle into a lockable TESF hinge that can allow a variable range of motion as selected by the surgeon. Previous versions of this device have been utilized in research projects and have made their way into clinical use. Each size ROM™ hinge features a multi-toothed locking nut that allows the surgeon to lock-in any desired starting position or “normal standing angle.” The opposite end of the ROM™ hinge body features a central flat that determines the locked position, and two adjacent arcs that allow for a variable degree of motion to be dialed in as desired. The ability to progressively increase the allotted range of motion during the healing period is unique to the ROM™ hinge and can be utilized or ignored depending on patient management requirements.
ROM™ hinges are modular by design and the hinge rods are easily interchanged to accommodate different limb length and patient anatomy. To change rods, loosen the corresponding nut or nuts and unscrew the rod from its mating hinge pin. This can usually be done by hand, but a pair of pliers can be used if needed. Since the hinge pin is held in position by the rod, it must be positioned before screwing in the replacement rod. Rod insertion into the hinge pin can be achieved from one direction only; therefore, it is necessary to seat the hinge pin properly to ensure correct rod insertion.