The overall range in the data is as follows. After a discectomy, patients lose an average of only about 1.2 weeks of work once activity restrictions are lifted, and about one third return to work within a week (Carragee 1999). Recovery after lumbar fusion is much longer. After minimally invasive fusion, patients need on average about 7 to 8.5 weeks, and after open surgery 11 to 17 weeks, to return to work (Wang 2017). Sick leave can differ by several months between one spine operation and another. The deciding factor is not how many days have passed since the stitches were removed. It is which operation the patient had and which kind of job the patient returns to.
There is no single standard for the length of sick leave after spine surgery. After a discectomy it is mostly 2 to 6 weeks. After lumbar fusion, light work takes about 2 to 3 months and manual work can take 3 to 6 months. The length depends on the type of surgery and the nature of the work, and being back at work does not mean full recovery. The sections below go through the literature behind each set of figures, and explain why finishing sick leave and being fully recovered are two different things.
One point should be made first. The number of weeks listed below are the median ranges found in the medical literature and not a fixed upper limit on a sick leave certificate. Different medical teams are more or less relaxed about activity restrictions after surgery (McGregor 2007). How many days of sick leave can actually be taken is decided by the surgeon in charge, based on imaging, the healing of the wound and bone, and the patient’s job. This article mainly explains the clinical basis for these time ranges.
Length of sick leave after discectomy and decompression
A simple discectomy or decompression falls in the category with relatively short sick leave. Carragee (1999) followed 152 working patients who had no activity restrictions after surgery. On average they lost only about 1.2 weeks of work, as many as 149 of 152 (98%) returned to work, about one third returned within a week, and very early return did not increase the risk of recurrence or repeat surgery. Earlier literature has no sufficient evidence to support long-term restriction of activity after surgery (McGregor 2007), and the latest systematic review also points out that the certainty of evidence that restricting activity after surgery lowers recurrence is low, and that after open discectomy the recurrence rate showed no significant difference with or without restrictions (Mathew 2025).
| Typical length of sick leave | Sick leave ranges from a few days to a few weeks, and recovery is shortest for office and sitting work. |
| Is early return to work safe | Returning to work early once activity restrictions are lifted did not increase the risk of recurrence or repeat surgery (Carragee 1999). Returning to daily activities early is a rehabilitation direction supported by evidence (McGregor 2007). |
| Points to note | An occupational cohort study of surgery for disc herniation (rather than simple excision) found that patients took an average of about 78 days of sick leave, and 95% had returned to work 12 months after surgery (Laasik 2021). This shows that the individual clinical diagnosis and the nature of the work can still make the recovery time very different. |
Length of sick leave after lumbar fusion (minimally invasive and open)
Once the operation involves spinal fusion (fixing the spinal segments and waiting for the bone to heal), the recovery time becomes much longer. A systematic review compared the time to return to work for two surgical approaches and found that return to work was clearly faster after minimally invasive surgery (MIS-TLIF) than after open surgery.
- Average return to work about 7.0 to 8.5 weeks (Wang 2017)
- Median of the most robust study about 7 weeks
- Less soft tissue injury, so the transition period is usually shorter
- Average return to work about 11.0 to 17.1 weeks (Wang 2017)
- Median of the most robust study about 11 weeks
- Involves bone healing, and the overall return-to-work rate at two years is still only 76% (Laurén 2025)
In other words, even among fusion operations, the time to return to work can differ by nearly double depending on the approach. Fusion surgery also does not only mean longer sick leave. Two years after surgery, a considerable proportion of patients have still not returned to work. This is the biggest difference between fusion and a simple discectomy, and it is also why the timeline for returning to work and sport has to be assessed separately for each type of surgery and cannot be summed up in a single number of days.
Suggested sick leave after cervical spine surgery
For cervical spine surgery (such as ACDF, anterior cervical discectomy and fusion, and CDR, cervical disc replacement), the medical profession does not yet have a consistent standard for return to work, and surgeons’ judgements differ quite widely. A survey found that, for non-sedentary or non-office jobs, doctors most often advise patients to return to work from about 6 weeks after surgery. Opinions differed most for laminoplasty, where the recommended recovery period ranged from 6 weeks to 3 months (Camino-Willhuber 2024). Patients after cervical surgery should therefore follow the specific instructions of the doctor in charge strictly, and should not apply the return-to-work timetable for lumbar surgery.
Office work and manual work: differences in sick leave and return to work
Even after the same operation, the type of job the patient returns to often influences the length of sick leave more than the operation itself. Two-year follow-up data after lumbar fusion show this:
Jobs that involve carrying heavy loads, long periods of standing or frequent bending and twisting need a longer recovery and transition period. Office or sitting work allows the earliest return, but its difficulty is whether the patient can tolerate sitting for long periods. The staged return-to-work criteria and loading thresholds differ between the two types of work.
How the length of sick leave before surgery affects return to work after surgery
Another factor that is often overlooked but has a lasting effect is how long the patient was already on sick leave before surgery. A Danish study of 678 patients who had lumbar disc surgery found that 83% of those operated on within three months returned to work, but only 50% of patients with more than three months of sick leave before surgery did so (Andersen 2017). Overall, about 72% of patients returned to work within a year. The data show that delaying surgery is closely linked to poorer work rehabilitation outcomes.
Time off work before surgery and return-to-work rate
- Sick leave before surgery of 3 months or less: about 83% returned to work
- Sick leave before surgery of more than 3 months: only about 50% returned to work (Andersen 2017)
- Long time off work itself weakens the patient’s fitness and confidence about returning to work
Residual pain after returning to work and recovery progress
- In patients with residual pain six months after lumbar fusion, the improvement in quality of life (QOL) is affected, and this can last as long as 24 months
- Among 208 patients, 28.8% (60 patients) were in the group with residual pain (Endo 2024)
- Returning to work is a functional milestone and does not mean the pain has gone completely
Finishing sick leave and going back to work is not the same as full recovery. After lumbar fusion, about a quarter of patients are still troubled by residual low back pain six months after surgery. This slows the improvement in quality of life, and the effect can last until two years after surgery (Endo 2024). After returning to work, the patient should therefore keep up core muscle and posture training, increase the physical load step by step, and should not stop the rehabilitation programme because the condition seems better.
Sick leave certificates, sickness allowance and physiotherapy arrangements in Hong Kong
In Hong Kong, sick leave after spine surgery is issued by the doctor in charge according to the type of surgery. Some points in the system and in practice are worth knowing beforehand:
Hong Kong rules on sick leave certificates and sickness allowance
- A sick leave certificate must be issued by a registered medical practitioner, Chinese medicine practitioner or dentist, and must state clearly the number of days the employee is unfit for work
- Sick leave of 4 or more consecutive days is needed to qualify for the statutory sickness allowance
- The daily sickness allowance is four fifths of the average daily wages in the preceding 12 months (see the Labour Department, Employment Ordinance, Cap. 57)
Common home rehabilitation practice and preparation
- In the first two to six weeks after surgery, family members or a home physiotherapist help the patient practise rising onto the side using the log-roll technique, and control how long each period of sitting lasts
- For fusion patients, residual pain is often more obvious after sitting for a long time (Endo 2024), so bending down to lift heavy objects should be avoided in daily life
- Shortly before returning to work, actual work movements can be simulated at home, and the physiotherapist assesses whether fitness has reached the standard needed for work
For official information, the Labour Department’s guidance on sickness allowance under the Employment Ordinance (Cap. 57) is the official basis for sick leave certificates, the rule on four consecutive days of sick leave and the calculation of the allowance. The Hospital Authority’s 智友站 (Smart Patient website) provides patient education on care after discharge and rehabilitation after surgery. In clinical practice, the most common misunderstanding is that manual workers think that they can carry heavy loads as usual once sick leave ends. In fact, a functional load-bearing assessment must be passed before returning to this kind of job, and the patient should not simply return to work because the sick leave has finished.
When to ask a physiotherapist for help
The answer to when the patient can return to work has never been a fixed number of days. Nova Health’s registered physiotherapists first find out the nature of the patient’s work (sitting, standing or carrying) and the type of surgery (excision compared with fusion), and then refer to the time ranges from clinical evidence: a few weeks after excision, about two to three months after fusion for light work and as long as three to six months for manual work. Patients in manual work must pass a functional load-bearing assessment before returning, and should not return to the job simply because the sick leave has ended. In a home physiotherapy assessment, the most common situation is that the patient takes being able to go to work to mean full recovery and suddenly stops the rehabilitation exercises. The therapist reminds the patient that returning to work is a milestone in functional recovery, that residual low back pain after surgery (especially in fusion patients after long periods of sitting) is very common, and that core muscle and posture training must continue after returning to work, with the physical load raised step by step. For the timing of bone healing in fusion cases, see the recovery timeline after spine surgery.