In reply to cb294:
> Beware diagnosis by internet and the usual blabla, but this sounds highly unlikely to me. I cannot see how you can injure you M. iliopsoas like that. It is largely internal, and as the muscle responsible for lifting your thigh almost impossible to overload by a rope between your legs.
Yep - had a confirmation from a consultant but it's hard to diagnose even with ultrasound. Although the iliopsoas is difficult to injure as a whole, but the tendon/fascia can get 'notched' or the tendon move, etc. Obviously I'll keep an 'eye' on it but at this point I know that it was related to the slip, in the same area and irritated by my harness in the same area.