Diabetic Neuropathy: The patient's uncontrolled diabetes and leg pain without a history of injury suggest diabetic neuropathy as the most likely diagnosis. High creatine kinase (CK) levels may be seen in diabetic patients due to muscle damage from neuropathy.

Muscle Injury or Strain: Although the patient reports no injury, it's possible that a minor, unnoticed strain or overuse could lead to muscle pain and elevated CK levels.
Diabetic Myonecrosis: This condition involves muscle infarction in diabetic patients and could explain the leg pain and elevated CK levels.
Peripheral Artery Disease (PAD): Uncontrolled diabetes is a significant risk factor for PAD, which could cause leg pain, especially during exertion.

Deep Vein Thrombosis (DVT): Although less likely, DVT is a potentially life-threatening condition that could cause leg pain and must be considered, especially if there are other risk factors such as recent immobility or cancer.
Compartment Syndrome: This is a medical emergency that could cause severe leg pain and elevated CK levels due to muscle ischemia. It's less likely without a history of injury but should be considered if the pain is severe and accompanied by other symptoms like pallor, poikilothermia, paresthesia, or paralysis.
Rhabdomyolysis: A condition where muscle tissue breaks down, which could be precipitated by uncontrolled diabetes, leading to very high CK levels and potentially life-threatening kidney damage.

Polymyositis: An inflammatory muscle disease that could cause muscle pain and elevated CK levels, though it's less common and not directly related to diabetes.
Lipid Storage Myopathies: Rare genetic disorders affecting muscle energy metabolism, potentially causing muscle pain and elevated CK levels, but these would be unusual in the context provided.