Ok, let me just impart my knowledge of anatomy on you guys to try to help this along.
There are many types of joints, Synovial, Fibrous, immovable, cartligous. Well, ok there are 4 types of joints. Anyway. There is never a point where bones directly connect to each other. "movable" joints, like the shoulder, elbow, knees, hips, etc etc, are encapselted by a fluid filled sac. (when you dislocate a shoulder, its still in the synovial capsule, and you can pop it back in, it doesnt fall out into your hand) This sac serves the pupose of housing the bones, lubricatiing them (otherwise moving them would be extremely painful) and also housing anything else like bursa for the joint. (your kneecap is a bursa, a pad like tissue) Synovial joints also are for things like the bones of the hand and feet, although they dont have alot of motion, they still can move around a little bit. Fibrous and cartilagounus joints are less moveable, yet still movable a bit. You find this in certin places in the spinal cord, where the vertebral disks are (althouth the spinal cord also has synovial joints in the vertebrea parts that move) Synovial capsules are just connective tissue, and arnt exactly very sturdy, muscle and ligaments, bone formation, and the capsule all come together and keep the bones together.
It would be impossbile for wolverine to have molecular boneded bones, as if adamantium is boned to his cells. Bones are constantly breaking down and building up. New cells are born in the marrow, which i'll get to in a second, and as the grow older grow out, until they are finally destroyed and recycled to new cells. If his bones were bonded with adamantium, then his cells wouldnt know wtf to do. The adamantium would prevent cells from being broken down, and there wouldnt be room for new cells to grow, and those cells wouldnt have admantium. It would be really crazy. Wolverine's adamantium probably works like a cage, it coats the outside of his bones with microscopic "slits" in it, becase if it was completed coated, WOlverine would fall over dead within a few days, even with his healing factor. Bones MAKE blood, red bone marrow is where your blood comes from. Your blood is also how your body heals, and last checked, stays alive. Without his blood being able to get out of his bones, he would fall over dead. There has to be space for the blood to get into his body, and for blood to get into his bones, otherwise his bones would die. They need blood to live too.
My puzzlment is wtf are those metal things in his hands his claws pop out of. They are made of adamantium, because when he was bone claw he didnt have them, but they have to extend down into his claw channels to protect them, otherwise hed bleed a bit everytime his claws popped out. Were they implanted during weapon X? They cant be made of adamantium through and through, otherwise he would be able to flex his wrist.