Abstract
Background
Peripheral brachial plexus injuries, particularly Radial nerve palsy (RNP), are a
common complication of humeral shaft fractures. Despite previous research, the specific
fracture patterns associated with RNP remain unclear.
Objectives
This study aims to assess the frequency and patterns of humeral shaft fractures, determine
the incidence of peripheral brachial plexus injuries such as radial and ulnar nerve
palsies, and investigate the association between specific fracture patterns and these
nerve injuries. We also explored other factors influencing RNP development and identified
potential risk factors or predictors.
Methods
This retrospective cohort study analyzed 144 patients with humeral shaft fractures
at King Saud Medical City from 2015 to 2022. Patient data, such as age, gender, and
neurovascular status, were extracted and analyzed using SPSS. RNP was diagnosed clinically.
Statistical analyses included chi-square and student t-tests, with a p-value of <0.05 for significance.
Results
This study found a 37.5% incidence of RNP in humeral shaft fractures. Significant
differences were observed in age (p = 0.032) and mechanism of injury (p < 0.0001), with most fractures due to road traffic accidents (72.22%) and closed
(93.75%). Common fracture patterns were AO 12A (37.5%) and AO 12B (39.58%), with a
higher prevalence of comminuted fractures (71 cases). Significant differences in fracture
patterns (p < 0.0001) and anteromedial comminution (p = 0.002) were noted between patients with and without RNP. Interestingly, four cases
of concomitant ulnar nerve palsy were observed in patients with radial nerve palsy.
However, no significant differences were found in gender (p = 0.343), open fractures (p = 0.214), or associated fractures (p = 0.106).
Conclusion
This study suggests that the severity of trauma, rather than specific fracture patterns,
is a more significant factor in RNP development in humeral shaft fractures. Further
research is needed to understand the underlying biomechanics.
Keywords
humeral shaft fracture - radial nerve palsy - fracture pattern - retrospective cohort
- trauma severity - biomechanics
