I admit, I splint after carpal tunnel release (CTR), though after reading this article I will change my ways. My use of splints after CTR has been because “I was taught that in training”. Not always a bad thing, but not always a good thing either. I was reminded of this by the opening of the article (first reference below):
Dogma is pervasive in all of medicine, and hand surgery is no exception. As the movement toward evidence-based medicine continues, clinical researchers have striven to dispel dogmatic practices for which no scientific support exists. One such target is the practice of splinting after carpal tunnel release. There have been five prospective, randomized trials, all since 1995, showing that postoperative splinting after this procedure is of no benefit, with one of them demonstrating that it is actually detrimental.
In their discussion section, the authors reviewed the five articles (2-6 references below) that show no advantage and some disadvantage to postop splinting. Here is what they say in summarizing the article by Cook et alFifty-three percent of respondents use full-time splinting postoperatively.Five percent of these respondents also prescribe the use of night splints after a variable period of full-time splinting.Night splinting is used as the only postoperative immobilization by 1 percent of respondents (night splinting was not offered as an option on the questionnaire so may be underrepresented as it required a write-in response)In addition, 1 percent of respondents wrote that they apply a bulky dressing. This practice was not counted as splinting.Within the subset of surgeons who apply splints after carpal tunnel release, there is tremendous variation in splinting duration, with a range of 1 day to 6 weeks.The duration reported most frequently (i.e., the mode response) within this subset is 7 days.It is noteworthy, however, that when considering the entire survey population, the most frequently reported duration is, decisively, 0 days (i.e., no splinting).
In the first of these trials, Cook et al randomized 50 patients undergoing open carpal tunnel release to be splinted for 2 weeks postoperatively or to begin unrestricted active motion on the first postoperative day.The prevention of flexor tendon bowstringing is frequently cited as the reason for splinting after carpal tunnel release. The authors of this survey article notes that
The drawbacks of immobilization were striking. At 1-month follow-up, the splinted group fared significantly worse with respect to the incidence of scar tenderness and pillar pain, patients' subjective pain rating, grip and key pinch strength, and patients' assessment of outcome.
Even more conspicuous was the splinted group's slower return to activities of daily living (12 days versus 6 days; p = 0.0004) and light-duty work (27 days versus 17 days; p = 0.005).
There were no wound complications, hematomas, bowstringing or adherence of flexor tendons, or neuromas in either group.
The authors concluded that splinting is largely detrimental but acknowledged that certain rare complications, such as bowstringing, might occur in a larger series. They recommended early mobilization but advised against simultaneous finger and wrist flexion, which might be more likely to result in bowstringing
To our knowledge, this complication has been reported only once, in a 1978 article by McDonald et al. In their series of 186 carpal tunnel releases, bowstringing was observed in two patients. Interestingly, these patients were splinted postoperatively, and in both cases the bowstringing occurred after reoperative carpal tunnel release.In their words, Bowstringing of the flexor tendons is a rare complication, possibly occurring as a result of removing a segment of the transverse carpal ligament or from inadequate immobilization following a carpal tunnel release.