Pediatric Hand and Wrist Fractures in Osteogenesis Imperfecta: An Analysis of Incidence, Patient-specific Risk Factors, and Fracture-specific Characteristics.

Abstract

Children with osteogenesis imperfecta (OI) frequently present with fractures; however, hand and wrist fractures (HWFs), those distal to the radial and ulnar diaphysis, are seldom observed. Yet, HWFs remain among the most common fractures in children with non-OI. The objective of this study was to identify the incidence of OI HWFs. Secondary objectives aimed at identifying patient-specific risk factors for HWFs in OI and comparing clinical courses to non-OI HWFs. A retrospective cohort study was conducted. Database query by ICD-10 codes identified 18 patients with OI HWF, 451 patients with OI without HWFs, and 26,183 patients with non-OI HWF. Power analysis estimated appropriate sample sizes and random sampling was utilized to collect patients. Patient demographics, OI-specific variables, fracture morphology, and fracture clinical courses were recorded. Data were analyzed for patient-specific and fracture-specific factors affecting OI HWF incidence. Of patients with OI, 3.8% (18/469) sustained HWFs. Patients with OI HWF were significantly older than patients with OI without HWFs ( P = 0.002) with no differences in height, weight, ethnicity, sex, or ambulatory status. Compared with non-OI HWFs, patients with OI HWF were significantly shorter ( P < 0.001), weighed less ( P = 0.002), and were less likely to be ambulatory ( P < 0.001). OI HWFs were more commonly on the side of hand dominance ( P < 0.001) with transverse patterns ( P = 0.001). OI HWFs were less frequent in the thumb ( P = 0.048) and trended towards significance in the metacarpals ( P = 0.054). All OI HWFs were treated nonoperatively with similar union rates and refracture rates to non-OI HWFs. Multivariate regression showed that older patient age (odds ratio: 1.079, 95% CI: 1.005,1.159, P = 0.037) and OI type I (odds ratio: 5.535, 95% CI: 1.069, 26.795, P = 0.041) were significant prognosticators for HWFs in patients with OI. OI HWFs are uncommon (3.8%, 18/469) but specific HWF morphologies and locations are more common in patients with OI; however, these are not pathognomonic. Older patients with mild penetrance of type I OI are at the highest risk for HWFs. OI HWFs do well when managed nonoperatively with noninferior clinical courses compared with non-OI HWFs. Level III.