I've had major surgery twice and lost weight (initially) both times. I ate less because I didn't have as much of an appetite, plus I craved healthier foods that made me feel better and gave me energy. I think that as long as you eat healthy foods and stick to your points, you'll be ok. You probably don't want to cut back much (if at all) since your body needs the nutrition now. If you do gain a couple of pounds, at least you'll know it was due to lack of activity, and it will come back off after you recover.
Congratulations on your 52lb loss! Good luck with your recovery