Objective: Closed reduction (CR) and spica cast immobilization for DDH treatment provide a good choice in in congenital hip displasia. Complication rates have been reported as high as 79%, and avascular necrosis (AVN) has proven to be particularly problematic. The exact etiology of AVN is unknown but likely multifactorial. Thrombocyte volume has been defined as a marker of thrombocyte activation. It is measured as mean platelet volume (MPV). The aim of this study was to investigate whether thrombocyte volume changes affect the femoral head.

Materials and Methods: We reviewed the medical records of all patients who underwent closed reduction of the hip for DDH at N.E. University Meram School of Medicine Hospital from 2013 to 2017. Pre- and early posroperative and first monthly complete blood counts (CBC) and MPV values were evaluated. We divided all patients in four groups in terms of age as Group1 birth to 6th month, Group 2 7th to 12 month, Group 3 13th to 18 month and Group4 older than 18 month.

Results: Patients are followed up 40.5 months (16–66). 39 patients were included and 43 hips were treated with CR and spica cast. AVN was occured in 8 patients (18.6%). Patients with AVN, MPV increased at early postoperative period (P<0.05).

Conclusion: MPV can be predictive value for AVN for DDH patients who were treated with CR and hip spica casting. MPV increasing in early postoperative period close follow-up should be applied.