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In my experience, non-traumatic knee injuries are a result of biomechanics issues at the hip or knee. You mention the hip, but it is also worth looking south to the ankle as well.
Also, don't rule out genetic predisposition. OA is degenerative is nature and while we can address the biomechanics to alleviate stress, we cannot ignore or prevent the genetic factor.
I'm not sure what your training is, but if you can confidently say there is hip weakness then even slight weakness would contribute to the breakdown process.
Anteversion and retroversion can also be measured visually in prone with someone who is skilled. But severe enough would cause a visual rotation at the tib/femur.
When addressing the hip, I find a lot of people only measure rotation in 90/90 supine and only assess bony morphology. Hip capsules are better assessed in prone/face down with knees bent to 90.
If you and the client are concerned, definitely get them to a specialist.