A splint works; the type matters less than wearing it properlyEmerging evidence
A Cochrane review found 4 trials (278 people), all with flaws, and no splint type clearly better; it stressed robust splints and sticking to the instructions. Since then, 3 trials have found no difference in the final droop between padded aluminium, stack and custom-made plastic splints, or between a ready-made splint and a finger cast. In one of them, treatment failed in 23.8% of people with stack or aluminium splints and none with custom-made ones, and people who wore their splint as told had less droop.
A review recommends 6 to 8 weeks of continuous splinting, longer if a droop persists; swelling, older age and not wearing the splint as advised made results worse.
Sources 3, 11, 13, 10, 14
Surgery isn't better for mostEmerging evidence
Across 44 studies, the average remaining droop was 5.7° after surgery and 7.6° after splinting, with similar complication rates (14.5% against 12.8%). A meta-analysis of 13 studies (3 of them trials) found no high-quality evidence that surgery is better, for bony or tendon injuries. In a trial of 48 tendon injuries, a splint and a wire across the joint gave the same result at 16 weeks.
For a bony mallet with a large fragment but the joint still lined up, splinting matched pinning in a trial of 32 people, with better bending afterwards, but 3 splinted joints later slipped out of line, which is why UK standards ask for an X-ray in the splint.
Sources 15, 16, 12, 17, 5
Night splinting afterwards: usual practice, little testedMixed evidence
After the full-time weeks, UK hand surgeons advise wearing the splint for protection during risky activities for a further 2 weeks, and NHS leaflets use it at night and at risky times for 1 to 4 weeks, sometimes longer, depending on the hospital. If the droop comes back, the UK standard restarts full-time splinting in 2-week blocks.
One small trial (51 people) found an extra month of night splinting added nothing to the final droop, function or satisfaction; your clinic may still advise it.
Sources 5, 1, 6, 18, 19, 20, 9
Late is still worth treatingEmerging evidence
In 10 fingers first treated 4 to 18 weeks after the injury, 8 weeks of splinting plus 2 at night gave 9 good or excellent results; 2 droops came back and recovered with 8 more weeks. The American Academy of Orthopaedic Surgeons (AAOS) says most doctors recommend treatment within a week of the injury, but that some fingers treated as much as a month late still healed completely. It's a small case series, but it supports getting a late mallet finger seen.
Sources 21, 2
Children: a drooping fingertip can be an open growth plate breakStrong evidence
In a child, a drooping fingertip can be a break through the growth plate of the end bone. When the nail fold bleeds, there's blood under the nail or the nail sits above the skin fold, UK hand surgeons treat it as an open fracture (a Seymour fracture): it needs cleaning out, antibiotics and accurate setting, because a missed one can lead to bone infection, a deformed nail and growth problems. In 28 children treated within 24 hours, with antibiotics, 1 developed a bone infection.
Sources 5, 22, 23
Gentle exercise after the splintEmerging evidence
In one trial, the tip drooped a little more just after the splint or wire came off and partly recovered with steady exercise; in another, the droop increased after splinting stopped and had improved by 24 weeks. NHS programmes bring bending back in small steps, for example 10°, then 20°, then 30° over successive weeks with the splint on in between, or bends of 20° to 30° with the middle joint held straight. No trial has compared these programmes, so follow your therapist's.
Sources 12, 11, 20, 6, 24, 25