Przejdź do treściFor an acute humeral shaft fracture, applying a functional brace immediately after the injury may not be the most comfortable or safest option during the first few days. The multicentre randomised COBRAS trial, published in the Journal of Orthopaedic Trauma, found that immediate Sarmiento bracing was associated with more pain and more skin complications than initial coaptation splinting followed by conversion to a brace after the acute swelling had settled. The study addresses only the first 10 days of treatment and does not answer questions about fracture union or long-term function.
Why is this study relevant to an orthopaedic surgeon?
Non-operative treatment of selected humeral shaft fractures is based on functional bracing. A practical question remains, however: should the Sarmiento brace be applied immediately after injury, or is it better to use a splint during the period of greatest swelling and move to functional bracing later?
This may look like a technical detail, but it affects pain, treatment tolerance and the condition of the skin. The value of the COBRAS trial is that it compared the two strategies in a randomised design rather than relying only on local preference.
Study question and methods
The multicentre, parallel-group randomised trial included adults with an acute closed AO/OTA 12A, 12B or 12C humeral shaft fracture selected for non-operative treatment. The analysis included 58 patients.
Two strategies were compared:
- initial coaptation splinting, followed by transition to a Sarmiento brace after the acute swelling had decreased;
- immediate application of a Sarmiento brace.
The investigators recorded daily pain on a 0–10 scale for the first 10 days, opioid use converted to morphine equivalents, PROMIS function, patient satisfaction and skin complications related to pressure from the splint or brace.
Results
Patients who received an immediate Sarmiento brace reported more pain during the first 10 days. The mean treatment effect was 0.97 points on the 0–10 pain scale against immediate bracing (95% CI 0.26–1.69; p=0.010).
The skin-complication difference was more pronounced: complications occurred in 33.3% of patients treated with an immediate brace compared with 7.1% of those who started in a coaptation splint (p=0.022).
There was no significant difference in cumulative opioid use over 10 days: the median was 20.0 mg morphine equivalents in the splint group and 32.5 mg in the immediate-brace group (p=0.308). There was also no significant difference in function measured on day 7 or in patient satisfaction.
How should the findings be interpreted?
The most practical conclusion is straightforward: there is no clear reason to rush the transition to a functional brace at the expense of poorer tolerance during the acute phase of injury. During the period of greatest swelling, a conventional coaptation splint may be better tolerated, with conversion to a functional brace once the soft tissues have settled.
A pain difference of about one point is not large in isolation, but it occurred alongside more than a fourfold difference in skin complications. That makes the overall result more clinically persuasive than the pain score alone.
Importantly, immediate bracing did not produce a detectable advantage in early function, opioid use or satisfaction. The trial therefore supports a staged approach during the first days after injury.
Limitations
- The analysis included only 58 patients, so the sample was small.
- The main observation period covered only the first 10 days after injury.
- The study focused on pain, tolerance and skin complications rather than fracture union.
- It does not show whether either strategy changes the risk of nonunion, secondary displacement or later surgery.
- The results apply to closed fractures selected for non-operative treatment and should not be extrapolated to fractures that require surgical fixation.
What could this change in practice?
The study does not introduce a new technology. Instead, it clarifies a simple element of everyday fracture care. For a patient with a closed humeral shaft fracture being treated non-operatively, it is reasonable to accept an initial period of splinting and move to functional bracing once swelling decreases rather than treating immediate Sarmiento bracing as a goal in itself.
What does the study not prove?
It does not prove that coaptation splinting leads to better union or better function after several months. It also does not determine which humeral shaft fractures should be treated operatively rather than non-operatively. This is a study of the initial phase of non-operative treatment, not of the entire management strategy.
Back to: Trauma — Literature for Clinicians
Source
Kingery MT, Ganta A, Egol KA. Comparison of Early Bracing Versus Splinting for the Initial Treatment of Acute Humeral Shaft Fractures (The COBRAS Trial). Journal of Orthopaedic Trauma. 2026;40(8):408–415. DOI: 10.1097/BOT.0000000000003196. PubMed: PMID 42466769.
Content prepared by: Tomasz Poboży - orthopaedic surgeon.