- Single leg squat
- Single leg hop
- Cross over hop
- Timed hop.
A great example of this is a recent study by Wren et al Orth Sport Phy Ther 2018. In this study the authors looked at 46 athletes that were 5-12 months post op ACLR. The authors used the single leg hop for distance test to assess the athlete's limb symmetry index (LSI) at the time of testing. In this test the subject would stand on one foot with their toes behind a line marked on the floor. The subject would hop forward as far as possible, landing on the same foot from which you took off. The distance for each jump was measured and recorded in centimeters (cm). In addition, each subject also performed the test while capturing their lower limb mechanics via a Vicon motion capture system.
The authors compared the distance in meters of the involved to the uninvolved side looking for an LSI of 90% symmetry. In addition, they also compared data captured via the Vicon system for each subject. The authors found some interested results:
- Both the groups that had LSI >90% and those that did not tended to offload the non-operative knee. Meaning they would subconsciously or consciously perform worse on the non-operative side in order to achieve 90% LSI.
- Although subjects had 90% LSI on the single leg hop for distance, this was not indicative of whether or not there was faulty biomechanics in achieving those results.