Management of Unicameral Bone Cyst with Pathological Fracture of Proximal Humerus with Curettage, Fibular Grafting and Plate Osteosynthesis: A Retrospective Study

Abstract

Introduction: Unicameral Bone Cysts (UBC) are benign fluid filled lesions at metaphyseal regions of long bones of immature skeleton. Several treatment options exist but none have proven to be the best. Curettage helps to remove the cyst membrane responsible for lysis of bone and fibular grafting with plate osteosynthesis which gives adequate stability to the fracture and promotes healing of the UBC of proximal humerus with pathological fracture. Aim: To assess functional outcome, pain relief, healing of the cyst and recurrence of lesion with curettage and fibular bone grafting with proximal humerus plating in UBC of proximal humerus with pathological fracture. Materials and Methods: This was a retrospective study done using the medical records of 10 patients with UBC of proximal humerus with pathological fracture treated with curettage and fibular grafting and plate osteosynthesis at Nizams Institute of Medical Sciences, Hyderabad, Telangana, India, between January 2018 to December 2021. Patients were studied for functional outcome by Musculoskeletal Tumour Society (MSTS) score before surgery and one year after surgery. Healing of the cysts was evaluated by using a modified classification system by Chang et al., and pain relief was evaluated with pre and postoperative Visual Analogue Scale (VAS). Paired t-tests were used to compare the MSTS scores and VAS scores. Results: Mean age of the study group was 15.6±2.3 years with range of 11-19 years. The MSTS score increased significantly after surgery from 11.6±2.06 to 27.3±1.6, p<0.0001. Cysts had healed completely in seven cases, partially in three cases and recurrence was seen in three cases at the end of one year. Mean VAS scores decreased significantly from 7.60±0.97 to 1.40±0.97 after the surgery. Among three cases with recurrence of UBC, two cases were diagnosed at eight months and one case at 12 months after surgery. Conclusion: Treatment of UBC of proximal humerus with pathological fracture by curettage, fibular grafting and plate osteosynthesis gives good functional outcome and cyst healing rate. It is a safe and effective procedure without any complications.

Keywords

• benign bone lesions
• musculoskeletal tumor society score
• recurrence
• simple bone cyst