NIHR Signal Two common operations to fix a broken tibia have similar outcomes
Published on 16 January 2018
In people who had broken the lower part of their tibia (shin bone), fixation using a metal rod nailed to the inside of the bone was compared with a locking plate screwed onto the surface of the bone. There was no difference in the quality of life, disability or pain at 12 months for people who had fractures of the lower tibia fixed using either technique.
NICE guidance recommends that surgery takes place within 24 hours of injury but does not mandate which type of surgery to perform. This NIHR UK-based trial was funded to find which treatment was better for lower tibial fractures.
During the trial, some people expressed a preference for one operation over the other and surgeons were generally more in favour of the nail fixation.
The findings suggest that surgeons should continue using their judgement to decide which surgical approach is best, in discussion with the patient.
- Musculo-skeletal disorders, Orthopaedics, Surgery
Why was this study needed?
Fractures of the tibia near the ankle can be difficult to treat because the bone lies so close to the skin.
Surgery aims to realign the ends of the broken bone and then to hold them securely in place while they heal. There is uncertainty whether fixing a rod inside the bone using nails is better or worse than a locking plate screwed onto the surface of the bone.
Both operations have downsides – the rod can break, whereas plates require a larger incision, which can increase the risk of infection. This UK trial compared the two techniques in people with a distal tibial fracture that had not penetrated the skin or involved the ankle joint.
What did this study do?
This UK FixDT randomised controlled trial included 321 people aged 16 or over (average age 45), with a distal tibial fracture admitted to any one of 28 UK trauma hospitals.
The type of surgical procedure was randomly decided in advance. Surgeons had flexibility in how they performed the surgery: for example, how many screws they used. A small number of patients did not receive the surgery they were allocated due to the surgeon’s overriding clinical judgment. However overall 91% of patients received the treatment to which they had been allocated.
It was not possible to blind patients or surgeons to the type of surgery, but the team treating them and the people assessing their outcomes were unaware of which surgical procedure they had undergone. This trial was well-conducted, and we can have confidence in the findings.
What did it find?
- At three months people who received nail fixation had a better average Disability Rating Index (DRI) score (44.2, 95% confidence interval [CI] 40.8 to 47.6) compared with people who received a locking plate (52.6, 95% CI 49.3 to 55.9). This resulted in a clinically meaningful adjusted difference of 8.8 points (95% CI 4.3 to 13.2). The DRI is a 100-point scale, from 0 (no disability) to 100 (complete disability).
- At six months people in the nail fixation group had lower average DRI scores (29.8, 95% CI 26.0 to 33.7) compared with the locking plates group (33.8, 95% CI 29.7 to 37.9) but the adjusted difference of 4.0 between the groups was not clinically meaningful (95% CI ‑1.6 to 9.0).
- At twelve months DRI scores were similar in the nail fixation (23.1, 95% CI 18.9 to 27.2) and locking plate (24.0, 95% CI 19.7 to 28.3) groups. Again the adjusted difference of 1.9 was not clinically significant (95% CI ‑3.2 to 6.9).
- There was no difference by 12 months in scores for quality of life (measured using the EuroQol Health-Related Quality-of-Life 3-Level score, EQ-5D-3L) or pain or function (Olerud-Molander Ankle Score, OMAS).
What does current guidance say on this issue?
There is no guidance on surgical technique for distal tibial fractures which do not involve the ankle joint.
What are the implications?
This UK-based trial suggests that disability, quality of life and pain up to 12 months after surgery are similar for nail fixation and locking plate fixation in people with an acute distal tibial fracture.
Practical considerations such as the type of fracture or soft tissue damage may still influence the surgeon’s judgment regarding the choice of surgery; it would be useful to understand the reasons given for changing approaches in this trial. Some people were excluded from the trial because they expressed a strong preference for one operation over the other. This suggests that there may be other factors for surgeons to consider when discussing the options with their patients to reach a shared decision about how best to proceed.
In the interim, it is useful to know that – contrary to expectations – long-term outcomes were similar.
Citation and Funding
Costa M, Achten J, Griffin J et al. Effect of locking plate fixation vs intramedullary nail fixation on 6-month disability among adults with displaced fracture of the distal tibia. The UK FixDT randomized clinical trial. JAMA. 2017;318(18):1767-76.
This project was funded by the NIHR Health Technology Assessment Programme (project number 11/136/04) and was supported by the NIHR Oxford Biomedical Research Centre and the NIHR Collaboration for Leadership in Applied Health Research and Care Oxford at Oxford Health National Health Service (NHS) Foundation Trust.
Most non-articular fractures of the lower tibia need surgical fixation, but the best method of fixation remains unclear. The two main types of fixation are either a medullary rod or a plate with screws.
The large randomised trial of adults with lower tibial fractures compared the clinical outcomes between the two modes of fixation. Although the Disability Rating Index was significantly superior in patients treated by a medullary rod at three months, there was no difference in any outcome measure by six months.
As both methods produce similar outcomes, surgeons may select a method based on other factors such as those relating to local soft-tissues.
Michael Pearse, Clinical Senior Lecturer and Consultant Orthopaedic Surgeon, Imperial College London