Ways to help rider stiffness?

Lately at the beginning of my rides especially when I begin to post to the trot, my riding has felt quite off. After about maybe 10 minutes I loosen up and can ride normally. This has only started happening recently after my month long hiatus because of a broken pelvis(a fall off a horse of course). Most of the stiffness seems to be in my hips and thighs so the broken pelvis probably caused it. My instructor says my hips don't look quite aligned either. Does anyone know of any stretches/exercises I could do on or off the horse to get rid of some of the stiffness or unalignmnet?

I suggest dancer's stretches. Dancer's always loosen by stretching, and you stretch an equal amount on both sides of your body. They don't throw themselves into the stretching, like other athletes do, just gentle pulses and a LOT of relaxing and holding the stretch.
Since you've had an injury I would look for an adult ballet class to learn. They KNOW that you are not candidate for a professional dancer, so you won't be pushed. Dancers typically hyperflex. If you are an older rider you might throw your back out attempting this!!
While on the horse, MY instructor had us warm up by reaching for the ears, reaching for the tail, (change hands, repeat), reach R hand to R foot, L hand to L foot, then R hand towards L foot, L hand towards R foot, then lay back. Repeat 3-5x. We did this at the walk, then later at the trot and at the canter. ALWAYS on safe school horses!!!!
It's a physical thing and improves your confidence in your own body.

I'd suggest physical therapy since you had an injury and have a lingering alignment issue. We can only suggest things in general but a therapist would be a me to customize the exercises to you. A chiropractor wouldn't hurt either.
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I agree with the suggestions made.

If you do see a PT, let them know at the beginning that you want stretches to do pre-riding. And if you've been cleared by your doc, you don't have to let them talk you out of riding. In fact, you may want to clarify that you WILL be riding before your first appointment.

I'd also tell them how many appointments you are willing to have. But, I'd do that with any exercise physiologist, chiro, or therapist.

Yoga!!!!!! I broke my tailbone 3 years ago and pulled some muscles in groin. Yoga stretches really helped. I bought a yoga beginning dvd and a yoga for inflexible people.

Thanks guys! I did a few stretches before my lesson and it seemed to help. I am definitely going to look into the yoga and dancer stretches. (I will find a physical therapist if this issue does not resolve soon)

Here's an article I just read on riding fitness...I agree with the stretching exercises such as yoga may be a good focus but you will want to balance your workout to improve your riding.

Get Fit, Ride Better

Some stretching exercises are good, yoga, pilates, basic stretches,before you get on your horse. Good luck

Keep in mind that tissue gets damaged with a fracture and the surgeon told me it takes about a year to completely heal or at least 90%.

Chiro? Massage also will help you.

Any exercises done while in pool would be great too, if you have access to that.