As a Physiotherapist and Senior Lecture in Sports Therapy I would suggest a hip resurfacing such as the Birmingham Hip (now the most popular arthroplasty worldwide).
Failure rate even amongst active sports people is only around 6% and a full hip replacement can always be considered if need be at a later date. I've known several Aikidoka who've had this procedure and it seems to work fine.
"Down time" is crucial i.e. don't rush back but full trainiing after about 26 weeks should be possible.
A surgeon called Mr Mc Minn is the main man for hip resurfacing.My hips can at times give me gip[pain ],Might end up in this clinic.Dr Mc Minn s consultation are private, work might be done NHS. Cheers, Joe.