Hip Flexor Strain: This is the most likely diagnosis due to the location of the pain (anterior hip) and the action that triggers it (picking leg up), which directly engages the hip flexor muscles.

Femoral Acetabular Impingement (FAI): This condition, characterized by abnormal contact between the femoral head and acetabulum, can cause anterior hip pain, especially with movements that involve flexion and internal rotation of the hip.
Iliopsoas Tendinitis: Inflammation of the iliopsoas tendon, which runs across the hip joint, can cause pain in the anterior hip region, particularly with activities that involve lifting the leg.
Osteoarthritis of the Hip: While more commonly associated with a broader range of hip movements, osteoarthritis can cause anterior hip pain, especially if the disease process affects the anterior aspect of the joint.

Avascular Necrosis (AVN) of the Femoral Head: A condition where the blood supply to the femoral head is interrupted, leading to necrosis of the bone tissue. It's crucial to diagnose early to prevent collapse of the femoral head and subsequent severe arthritis.
Slipped Capital Femoral Epiphysis (SCFE): A condition in adolescents where the growth plate is weakened, and the femoral head slips out of place. It requires urgent attention to prevent long-term damage and disability.
Septic Arthritis of the Hip: An infection within the hip joint, which is a medical emergency requiring prompt diagnosis and treatment to prevent destruction of the joint and potential systemic complications.

Piriformis Syndrome: Although more commonly associated with posterior hip and buttock pain due to compression of the sciatic nerve, in rare cases, it can cause anterior hip pain if the piriformis muscle irritates structures in the anterior hip.
Intra-abdominal or Intrapelvic Pathology: Rarely, conditions such as an intra-abdominal shunt or a pelvic mass can refer pain to the anterior hip region, often accompanied by other systemic or abdominal symptoms.