Hemarthrosis is the medical term for bleeding in a joint. When you have pain and swelling in a single joint (monoarticular), hemarthrosis is a common cause. It is a cause for concern not only because of the pain, but because prolonged blood exposure can damage the cartilage.
Injury to the peripheral nerve (nerves outside of the brain and spinal cord) may result from blunt force, fractures, crush injuries, stretch, penetrating or cut injuries. The nerves of the upper limb are the most commonly injured. The healing process from nerve injury can take from a few weeks to a few months.
Peripheral Nerve Damage: Damage to peripheral nerves often results in sensory and motor symptoms. The sensory losses would include all somatosensory sensations if the peripheral nerve contains all the afferent axons supplying the skin, muscles and joints of a given body part (e.g., the hand or jaw).