INTRAMEDULLARY HUMERAL NAILING ; UNION RATES AND SHOULDER FUNCTION.

Abstract

Introduction: We performed a clinical and radiological study to determine the functional outcome in terms of union and shoulder function and other related complications associated with treatment of humeral diaphyseal fractures with Intramedullary nailing.

Methods and Patients: A review of 100 consecutive humeral nailing over a period of four years performed solely for diaphyseal fractures using Russell Taylor nails.

• 51 male and 49 female.

• Average age of 48.0 (25.3–63.8IQR)

• 45 Simple, 46 comminuted and 9 pathological fractures.

• 70 were isolated and 10 were part of multiple trauma fractures.

• 91 closed and 9 open fractures.

• 52 fractures due to simple falls, 30 road traffic accident,9 pathological fracture,8 work related and 1 unknow cause.

Out of 100 nails, 90 were statically locked while 9 were locked proximally and 1 was locked only distally.

The outcomes were assessed clinically, radiologically and using the Disability of Arm Shoulder and Hand (DASH) function scoring system.

Statistically Cronbach’s alphas were calculated for the three scales of the DASH instrument. These scales were the function/symptom scale consisting of 30 items, sports/music module containing 4 items, and work module comprising 4 items.

Medians (interquartile ranges) and ranges are presented for numerical variables.

Mann-Whitney U tests (two-tailed) and Univariate and multivariate regression analysis were used.

Results: 90% fractures united initially and 4% had delayed union, giving cumulative union rate of 94%. Six non unions required a second procedure.

The DASH function scale scores was categorised into good 71 patients 85.5% (Score 0-< 25),

Medium 4 patients 4.8% (Score 25-< 40) and Poor 8 patients 9.6% (Score 40+).

Univariate and multivariate regression analysis showed, Increasing age (adjusted OR=0.96,95%CI 0.93–0.99,P< 0.01) and communited compared to simple fractures (adjusted OR=0.12,95%CI 0.03–0.45,P< 0.01) were associated with reduced likelihood of attaining full range of motion.

Male patients (unadjusted OR=2.37,95%CI 0.90–6.25,P=0.08) and patients involved in RTA compared to falls (unadjusted OR=4.5,95%CI 0.96–21.07,P=0.06) were associated with higher likelihood of attaining full range of motion.

85 % had no complication, while 15 % had complications.

One nerve palsy and one case of infection.

Seven patients required nail removal and 3 required removal of proximal locking screw.

Conclusion: To date, we have the largest series in the literature of antegrade nailing for diaphyseal fractures. In our series the vast majority of patients achieved desired functional outcome and union, hence we recommend the use of intramedullary nailing for humeral diaphyseal fractures. By eliminating surgical technique errors, complications can be reduced further and even higher union rates can be achieved.