Assessment of Pain Severity and Grip Strength as the Most Accurate Predictors of the Outcome of Treatment of Distal Radial Fractures.

Background: Distal radial fractures are common injuries, accounting for approximately 25% of fractures in the paediatric population and up to 18% of all fractures in the elderly age group. Assessment of treatment outcomes of these fractures includes objective measurements of wrist joint range of motion and grip strength as well as subjective parameters such as the intensity of perceived pain, hand function and quality of life. The recent years have ushered in a trend towards using several outcome measures for a more comprehensive evaluation of the results of the treatment. The objective of this study was to investigate whether the assessment of pain severity and grip strength is sufficiently accurate for correct assessment of the outcome of the treatment of distal radial fractures.

Materials and methods: One hundred and two patients, 79 women (77%) and 23 men (23%), at a mean age of 54 years with distal radial fractures were treated operatively. Treatment outcomes were assessed at 3 and 6 months by measurements of intensity of pain (according to a numerical rating scale, NRS), grip strength (with a dynamometer) and hand function with the DASH questionnaire. The results of these measurements were compared in order to investigate the strength of the possible correlation between variables.

Results: An analysis of the correlation between the variables of interest at 3 and 6 months' assessment showed statistically significant correlations (Spearman rank test, R=0,26-0,41; p<0,01). The NRS correlated negatively with grip strength (less pain - greater strength) and positively with DASH scores (less pain - better hand function). The correlation between grip strength and the DASH was the strongest (Spearman rank test R=0,61; p<0,001, showing that greater power of the hand indicated better function, whereas weaker grip indicated worse function.

Conclusions: 1. The severity of pain and the degree of weakness of the hand show (independently of each other) a very good correlation with the comprehensive assessment of hand function using the DASH questionnaire. 2. It follows that pain severity and hand weakness are sufficient to reliably assess the outcome of the treatment of a distal radius fracture.