Michael asked whether the ulnar claw healed in comment. A short answer is Yes.
Better analysis is that ulnar claw will probably never fully heal, the thing is precaution. You can feel the symptoms of ulnar claws in situations having excessive loss of minerals (nerve damage impairs the transportation of minerals in the arms) such as excessive sauna or tiresome tennis match: crucial thing is to have proper hydration with proper salts to avoid cramps and strain on nerves.
Before symptoms of ulnar claw reoccur, you can stop the activity or change the technique for less intensive.
I attribute the original ulnar claw to things such as bad blood circulation in shoulder and overtraining changing the biomechanics over the torso. Tennis requires asymmetric swings and excessive needs over whole body due to the swings, any imbalance can worse your technique a lot. Things that I have fixed contain armspan and legspan so far-better crossing shots, topspins and less injury-prone in games because the blood flow is not blocked by imbalances over the body. The following threads contain some of my development
Arm cross stretching behind the back, how to improve it?
Legspan requirements for different running styles?
where a good diagnosis technique or red alert observation is to acknowledge whether your arm after sleep feels like dead (blood blocked somewhere in the shoulder likely) or other symptoms. They can be triggered by multiple factors such as bad training, bad recovery and bad hydration.
The symptoms of ulnar claw can also be triggered without training such as in stressful situations. Things contain bad posture over excessive amount of time and lack of variety.
My case worked out without any surgery and I have had now no symptoms at least over year, almost forgetting the whole thing. I do carry things such as BandIt and sufficient stretching tools in my training bag and I have developed techniques to alleviate the symptoms. Precaution is the best thing: things such as bruises or painful small bruise-like things with white center in the joints of arms are red alerts.
I hope best of luck to everyone dealing with ulnar claw, it is an opportunity to make you far better in things you enjoy the most :)
[Januaray 2015] long time until symptoms back after intensive sauna and swimming which I attribute to losing minerals and somehow softening the myofascia, softening muscles, nerves and skin and losing minerals at the same time backfiring, awesome relaxation but symptoms getting back such as paresthesia and losing the range of motion in fingers.
[10th November 2014] symptoms back after playing hours piano, treatment techniques here.
[24th June 2014] general doctor order me 2 weeks of rest with anti-inflamatory painkillers
Slow process of diagnosing this: information here is a summary of my treatment and helped by top neurosurgeons, physiotherapists, couches and other professionals. You can read my diary below. We are trying to get me back to games fast.
I am doubtful about this because I cannot see inflammation. I try it and fingers developing some pain after being in the mold 1-2 days.
[26th June] no inflamation whatsoever so my couch instructs me to prepare me to use the hand normally
Stiffness in the little finger and ringer finger and pain in the little finger when trying to put into fist after being a long time in alu mold. Too stiff shoulders: cold in shoulders relaxes the ring finger. Hot in hand relaxes the stiffness in little finger and ring finger.
I am feeling totally normal again and sleeping with alumium fold again so the fingers get oxygen during sleeping. Goal is to get better in one week like pros.
Bandit-style device made my fingers feel stiff. Cold makes my little and ring finger feel stiff. So I got compression socks to hands which increase the blood flow and makes the forearm feel more warm, feels good.
Having the aluminium mold on during the night can make the extensor digitorum in the little finger darker after night. After relaxing it, the darkness go away and this stiffness get lessened but the spring-feeling stays.
30th June: little finger starting to feel normal after adding exteremely strong compression to forearm
I realised that I can get away with the jumpiness/springiness/stiffiness/powerlessness of the little-finger by pressing tight at certain points of the hand. So I tested a rubber band: the blood-flow gets totally intercepted but the little finger started to work like normal for a while! Wohoo! The colour of my hand changed and oddly my middle finger started to feel odd, I don't know how this can work -- somehow extremely tight compression in the forearm released some tension or something like that and you need to be careful not damaging other fingers.
2th July: BandIt arrived
Rubber band method and BandIt are about the same method but BandIt does not block your blood flow that much, fingers staying white i.e. not getting red/black with BandIt. The coordination of my little finger has returned back due to playing with rubber band and I believe BandIt is the safer method equivalent to rubber band that can be used during any sport.
Different Stretching Methods
Push-ups with fingers feel very very good to the fingers, this is because deadlifts with about 90kg require a proper warmup.
Rise-bowl-scrutching-method suggested here warms up the
whole hand and actually simulates the handles of different sized rackets -- unfortunately the shape of crutching rice and crutching
handles of rackets are not the same so not specific to the
3th method: Static stretching
Stretching like here but at least 30
seconds' interval so it takes at least 20 minutes to stretch just one
hand. Excellent stretching also
here by a rock climber,
it feels excellent!
Different relaxation methods
I. method: resting during rock climbing
A rock climber shows here advanced resting
techniques for hands. It may be possible to adjust to other sports:
hands slowly down and then hand up here crutching hand push the fresh
blood back to the hand.
Different coordination methods
Powerball is not sufficiently powerful/large to train my fingers on my serving hand. It certainly makes fingers a bit more flexible in
left but I think the main thing it helps with is coordination, it actives areas of hands which may not be under normal usage during day
and sporadic spinning requires proper coordination or bad sounding
Related Threads and material
How to develop sensitivity of hands and arms?
How to treat tennis elbow
Rehabilitation for Ulnar nerve, awesome stretching movements in the video "Ulnar Nerve Flossing Exercise - Amazing Results - Kinetic