Low back pain (LBP) is one of the most common types of work-related musculoskeletal disorders (MSDs) (1, 2). LBP is an important public health subject with high prevalence and a considerable negative physical, psychological, social, and economic impact (3–5). In general, this disorder due to the duration of pain includes three categories: acute (less than 6 weeks), subacute (from 6 to 12 weeks), and chronic (more than 12 weeks) (6, 7).

The peak of LBP is in the third decade of life, and its incidence increases to 60–65 years and then gradually decreases (8, 9). Nearly more than half of the general population will experience LBP care at some point in their lives (10). The prevalence of LBP among the general population is estimated to be from 15% to 45% (11). Thirty-seven percent of LBP is related to occupations in which professionals are exposed to prolonged periods of standing, such as healthcare workers (3). LBP can be caused by various components of the spine, abdominal structures, or pelvic organ (12). Among healthcare workers, nurses have a high incidence of LBP (13) due to physical and emotional factors (14). Considering the prolonged standing, unpleasant physical conditions, and movement limitations during surgery (15), the prevalence of LBP was reported in 70.6% of operating room personnel (16) and most other parts of the hospital (17).

The purpose of this research was to determine the frequency of LBP and clinical features among operating room staff at Shiraz University of Medical Sciences. The findings of this research will be presented to hospital administrators and operating room directors, who will be able to design suitable initiatives to prevent, control and reduce the recurrence of low back pain in operating room staff.

A total of 385 operating room personnel working in six hospitals affiliated with Shiraz University of Medical Sciences were studied. Table 1 shows the frequency distribution of the demographic characteristics of the population under study. Among 385 participants, 240 (62.3%) were women. The mean and standard deviation of the age was 33.25 ± 7 7.96. Besides, the majorities of participants were undergraduates (85.7%) and married (57.4%).

The prevalence of LBP was reported at 75%. Therefore, it was found that the prevalence of LBP in hospitals varied, and the highest prevalence (84.2%) was in the hospital of burn and plastic (Table 2). Also, the highest prevalence of LBP was in married (61.05%) people.

Table 3 shows the clinical characteristics of low back pain in the participants of this study. Most participants had a normal body mass index (BMI) (73.2%), work experience of less than 10 years (60.3%), rotating shifts (71.7%), and standing physical condition (54%). In addition, in 67.71% of participants, low back pain occurred less than 10 years after the start of work, and 81.40% of total low back pain was acute low back pain in nature. Sixty-seven percent of the patients reported pain only in the lumbar region, and according to the type of pain, intermittent pain was the most frequent, with 32.28%. Another criterion evaluated in this study was the severity of pain in the patients. Furthermore, transient mild pain that resolves spontaneously without using analgesics or rest was the highest, with 60.35%. The relationship between participant demographic information and clinical characteristics of low back pain showed that only sex (p-value = 0.023) and marital status (p-value = 0.017) had a significant relationship with pain area (Table 4).

The present study was performed to evaluate the prevalence of LBP and its clinical characterization in operating room personnel of six hospitals affiliated with Shiraz University of Medical Sciences. This study’s results showed a high prevalence of low back pain (75%) in operating room personnel. LBP is one of the most common work-related MSDs (19), which has many detrimental consequences for the healthcare system and its personnel (20).

LBP had a high prevalence among participants. In a study conducted by Choobineh et al. to investigate the prevalence of MSDs in the Shiraz operating room nurses, it was found that more than half of the participants had LBP during the past year, which was the most prevalent among other MSDs (18). High prevalence can be attributed to working in a stressful operating room environment and specific activities. In another study, Trinkoff et al. reported LBP as the most common musculoskeletal disorder in nurses at the University of Maryland, USA (21). The prevalence of LBP was higher in women, indicating the impact of the female sex on the development of low back pain (8).

The other additional results of this study revealed differentiated pain duration. Consistent with this finding, 167 patients had acute LBP and a few suffered from chronic LBP. In the study by La Torre et al., LBP was identified as the most important musculoskeletal disorder among operating room nurses in Rome, and acute LBP was the most prevalent (23). The high prevalence of acute LBP in these studies may be in terms of the heavy and risky transient activity during surgical operations, such as stretching and specific physical postures in operating room personnel. Besides, in a study conducted by Barkhordari et al. to evaluate the prevalence of LBP in nurses of hospitals in Yazd, the duration of pain in LBP patients was in two-thirds cases less than two weeks and in others at least two weeks during the past 12 months (24).

Other results of this study indicated the absence of work in one-third of the affected people. Moreover, about two-thirds of patients did not see a doctor. Among those who were referred to a physician, most people underwent diagnostic or therapeutic measures. Drug therapy and X-rays were the most prevalent diagnostic modality among these measures. In a similar study, Bejia et al. reported the prevalence of LBP in more than half of Monastir Tunisian hospital staff. About one-quarter of patients in this study suffered from chronic low back pain. Thus, it was found that most patients needed medical care, and about half of them needed radiologic diagnoses. Hence, in a significant number of participants, LBP led to absence from work (25). Regarding the high rate of chronic LBP in the study of Bejia compared to the present study, there may be an increased need for patients with medical care and radiological diagnoses, as well as an increased absence of work related to this type of LBP.

Another notable result of this study was determining the severity of LBP and its impact on participants’ daily life activities. The results showed that more than half of the patients had transient and permanent mild pain, about two-fifths of them had moderate pain that prevented heavy physical activity or heavy work, and only a few suffered severe pain that prevented them from doing their daily activities. In a study conducted by Awosan et al. to investigate the prevalence of LBP among healthcare workers in Sokoto, Nigeria, most participants experienced LBP after work. Among the patients, about half had mild pain, a significant number had moderate pain, and a small number had severe pain (26). By comparing the results of the Awosan study and the present study, it was found that most patients had mild pain. High-risk activities are probably the reason for increased pain over time, while rest leads to decreased pain intensity and less progression towards chronic forms.

The present study showed a high prevalence of low back pain among the operating room personnel. By examining the different factors and characteristics of participants, there was a significant relationship among LBP, education level, and marital status. Therefore, more attention is needed to these cases, and the increase in awareness among operating room staff via taking classes and courses has partly reduced the prevalence of the disorder.