Gait analysis studies in the elderly show that they typically have a shortened step length. Whether that is a result of tight hip flexors or due to reduced balance, the propensity to walk with shorter steps will itself lead to tightness in hip flexors and anterior joint structures. Hip stretches may be a relatively easy preventative strategy for the elderly with gait abnormalities and may help to prevent falls.
The piriformis muscle connects the top of the femur to the spine, and it’s the main one that supports the outward movement of the hip, upper leg, and foot. The sciatic nerve can sometimes pass through this muscle and thus cause sciatica symptoms, otherwise known as piriformis syndrome, characterized by pain in the lower back and hips, poor movement, and balance. Therefore, the main cause of sciatica is the swelling or constriction of the piriformis muscle, but it can also be a result of some other factors as well.
The problem is that these muscles aren't designed to be prime movers—they're designed to support the action of the glutes. Inability of activating the glutes can result in low back pain (low back muscles compensating), hamstring strains (overacting hamstrings), hip pain (resulting from hamstring-dominant hip extension) and knee pain (poor glute medius strength).
Resisted hip flexion: Stand facing away from a door. Tie a loop in one end of a piece of elastic tubing and put it around the ankle on your injured side. Tie a knot in the other end of the tubing and shut the knot in the door near the floor. Tighten the front of your thigh muscle and bring the leg with the tubing forward, keeping your leg straight. Return to the starting position. Do 2 sets of 15.
How to: Lie on your back with your right knee bent and foot flat on the floor (a). With your left leg fully extended, press into your right foot to shift onto your left hip. This is your starting position (b). Then, squeeze your right glutes to press your left hip open until you feel a stretch, pause, then return to start. That’s one rep (c). Perform six to eight reps, then repeat on the opposite side.