SUMMARY
Reduced impact loading or anti-gravity training has recently been introduced as a new tool in the rehabilitation of orthopaedic conditions that require restricted weight bearing. The purpose of this strategy is to speed up the functional rehabilitation while at the same time protect the healing structures from harmful effects associated with impact loading. Anti-gravity treadmills (AlterG ®) and harness suspension devices seem to be the two most promising techniques. It is however today unclear how effective these devices are.The purpose of our study was therefore to perform a systematic literature review on the actual technology available and its effect on impact load reduction, as well as its effectiveness in accelerating functional recovery after meniscal and chondral injury to the knee.The results from our work demonstrate that only a limited number of studies are available, usually of moderate quality. The data suggest a variable effect on cartilage regeneration, and a potential for accelerated functional recovery in gait and running dynamics both with anti-gravity treadmill as well as suspension harness systems.