Sometimes when I'm washing Crystal's rear legs one on them clunks when I straighten it. It sounds like a small displacement. She's 16 months old and I've read up about 'luxating patellas', but this seems more at the hip than the knee? She's a great runner and loves jumping too

and so far there seems no degradation to her movement. Has anyone else experienced such a symptom? I suffered the paralysis of my right arm due to an impact injury 'avulsing' my radial and ulna nerves 40 years ago now. The sound is similar to my scapular moving around due to its displacement as muscle tissue has deteriorated. I massage the hip for her but she shows no reaction to this - either way?
Any input, or shared experiences would be greatly appreciated... Thanks