Unilateral Sacral Fractures Demonstrate Slow Recovery of Patient Reported Outcomes Irrespective of Treatment

Abstract

Objectives: To report functional outcomes of unilateral sacral fractures treated both operatively and nonoperatively

Design: Prospective, multicenter, observational

Setting: 16 level 1 trauma centers

Patients/participants: Skeletally mature patients with unilateral zone 1 or 2 sacral fractures categorized as: displaced nonoperative (DN), displaced operative (DO), nondisplaced nonoperative (NN), nondisplaced operative (NO)

Main outcome measurements: Pelvic displacement was documented on injury plain radiographs. Short Musculoskeletal Function Assessment (SMFA) scores were obtained at baseline and 3, 6, 12, and 24 months following injury. Displacement was defined as greater than 5 mm in any plane at the time of injury.

Results: 286 patients with unilateral sacral fractures were initially enrolled, mean age 40 and mean Injury Severity Score (ISS) 16 were included. One hundred twenty-three patients completed 2 year follow up as follows; 29 DN, 30 DO, 47 NN, and 17 NO with 56% loss to follow-up at 2 years. Highest dysfunction was seen at 3 months for all groups with mean SMFA dysfunction scores; 25 DN, 28 DO, 27 NN, 31 NO. Mean SMFA scores at 2 years for all groups were 13 DN, 12 DO, 17 NN, 17 NO.

Conclusions: All groups (operative/nonoperative and displaced/non-displaced) reported worst function 3 months following injury and all but (DN) continued to recover for 2 years following injury, with peak recovery for DN seen at 1 year. No functional benefit was seen with operative intervention for either displaced or non-displaced injuries at any time point.