Medial Meniscus Tear: The mechanism of injury, hearing a clicking sound, and experiencing pain after sitting in an Indian style position, is consistent with a medial meniscus tear. This type of injury is common in activities that involve twisting or bending of the knee.

Ligament Sprain: The injury could also be a ligament sprain, particularly to the medial collateral ligament (MCL), given the mechanism of injury and the location of the pain.
Patellofemoral Pain Syndrome: Sitting in an Indian style position can put pressure on the knee joint, leading to pain and discomfort, which could be indicative of patellofemoral pain syndrome.
Osteochondritis Dissecans: This condition, which affects the cartilage and bone in the knee joint, could also be a possible diagnosis, especially if the patient has experienced pain or locking sensations in the knee.

Fracture: Although less likely, it is crucial not to miss a fracture, particularly an occult fracture, which may not be immediately apparent on initial examination. A fracture could lead to serious complications if not properly diagnosed and treated.
Septic Arthritis: This is a medical emergency that requires prompt diagnosis and treatment. Although the presentation may not initially suggest septic arthritis, any delay in diagnosis could lead to severe consequences.
Neurovascular Injury: Injury to the nerves or blood vessels around the knee could have significant and long-lasting effects, making it essential to consider and rule out these conditions.

Osteonecrosis: This condition, which involves the death of bone tissue due to a lack of blood supply, is less common but could be a consideration, especially if the patient has risk factors such as steroid use or excessive alcohol consumption.
Tumor: Although extremely rare, a tumor could cause knee pain and should be considered in the differential diagnosis, especially if the pain is persistent and unexplained by other causes.