You may be a candidate for four-track skiing if you have mobility impairment that requires the use of outriggers or a walker for stability while skiing. If you usually experience balance problems or general weakness in the lower extremities, you must have at least four points of contact with the snow, i.e., two skis and two outriggers or two skis with a walker.
We may connect skis with a ski bra at the tips (a metal device that clamps onto the tips of the skis to keep errant ski tips together) and sometimes a spacer bar between the feet, or you may need your skis connected to a walker on skis for additional stability.
You may successfully ski on a monoboard with outriggers. Potential users include those with severe hip problems, full leg braces, and/or high-bilateral amputees who use prostheses.
Boots and skis - no special modifications needed.
Outriggers - We use a Canadian-style crutch with an adapter that allows a ski tip to be attached to the end. It is a flip-up kind, wherein the skier can pull a string extending from the handle to the adapter to flip up the ski and expose metal claws that provide grip when walking or climbing. These outriggers also have a metal "comb" on the tail of the ski tip that acts as a brake, the angle of which can be adjusted by raising or lowering a screw in the adapter system. The brake can be lenghtened for more stability or shortened for less restriction of the ski's ability to slide.
Outriggers serve a variety of purposes for both stand-up and sit-down skiers. They function much like standard ski poles yet provide additional support and aid turning ability.
Ski bra - This is a metal clip used to attach the tips of the skis together. Some of the different varieties are hook-and-eye, trombone, Edgie-wedgie or Klip-ski.
Space bar - This adaptive equipment consists of a hollow piece of tubing through which a bungee cord has been threaded and knotted at each end. We place the space bar perpendicular to the skier's bindings with the bungee cord stretching across the binding so that when the skier steps into the binding, the knots end up on the outside of the skier's boots. This attaches the bar at the boot, giving the skier lateral support.
Tether - This consists of two pieces of line, 18 to 20 feet long, with carabiners or some kind of hook attachment at one end. When we hold one end and clip the other to the skier's ski bra, binding, walker, or harness, a tether allows us to help skier control speed and shape turns.
Slant board - This piece of equipment consists of a board mounted between the ski and binding, which can be used to slant the skier fore or aft and laterally, or to compensate for gross leg-length differences.
Walker - This refers to a walker mounted on skis. The four-track skier will ski on two skis, with the walker affixed to the skis with brackets. Sometimes the skier's skis are attached to each other with a ski bra, and sometimes the ski bra attaches the skier's skis to the walker's skis.
Monoboard - This is a double-width ski (approx. 8 inches wide), which is shorter than a regular ski and has two bindings mounted side by side in the center. Although not designed as an adaptive skiing tool, monoboards are suitable for some four-track skiers