Lying wall slides - a passive flexion stretch
The lying wall slides exercise is a passive flexion stretch, using the weight of the limb itself to gently force the knee into flexion.
It may be easier to do the exercise with a helper and perhaps lie adjacent to a door opening, so that it is easier to swing the knees up.
"....physical therapy can improve knee pain and function with non-operative treatment...knee pain and function can significantly improve by increasing knee range of motion...."
Actively assisting the wall slide
If a point is reached where the knee is too stiff to flex further on its own, then you can use the good leg to help it go down a little bit more.
How important is regaining flexion?
In many countries where domestic activities are often undertaken on or close to the floor, knee flexion is very important.
"....Unlike Western population, social customs and traditions require Indian patients to perform activities such as cross-legged sitting, squatting, and kneeling, which require high knee flexion (>120°)....."
But in the Western world, where chairs, seats, desks, tables and kitchen counters are more the norm, it is not as important to regain full flexion as it is to regain full extension.
Other relevant links
Range of motion, Flexion, Low Load Prolonged Stretching, Lying wall slides (facilitated)
Forum discussions
- The 1% group who never regain full R.O.M. - Patients chat about limitations of flexion.