In this report, we present the case of a female patient with rigid fibrous ankylosis of the hip after undergoing two surgeries to reduce developmental hip dislocation, which was successfully treated with neoacetabuloplasty that helped her to regain hip mobility. An 18-year-old female patient was diagnosed with developmental dislocation of the hip after 1 year of age. After two surgeries, the patient's hip was dislocated and showed rigid fibrous ankylosis. Treatment of rigid fibrous ankylosis in preschool children remains debatable. After the first surgery at the age of 3 years, her hip redislocated and mobility was limited
after the second surgery performed at the age of 4 years, the hip redislocated the second time, leading to immobility. The loose fibrous ankyloses became rigid. She underwent neoacetabuloplasty at the age of 6 years. The patient started walking after physiotherapy, 3 months postoperatively. After neoacetabuloplasty, the patient enjoyed an unrestricted lifestyle with a normal school and life schedule for 12 years. At the age of 18 years, her hip mobility was within normal limits without any pain.