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Official Journal of the Italian Society of Orthopaedics and Traumatology

  • Systematic Review
  • Open access
  • Published:

Imageless navigation for primary total hip arthroplasty: a meta-analysis study

Abstract

Background

There has been a growing interest in imageless navigation for primary total hip arthroplasty (THA). Its superiority over standard THA is debated. This meta-analysis compared surgical duration, implant positioning, Harris Hip Score and rate of dislocation of imageless navigation versus conventional THA.

Methods

The present study was conducted according to the PRISMA 2020 guidelines. All the clinical trials comparing imageless navigation versus conventional for primary THA were accessed. In January 2022, the following databases were accessed: PubMed, Web of Science, Google Scholar and Embase. No time constraints were used for the search. The outcomes of interest were to compare cup inclination and anteversion, leg length discrepancy, surgical duration, Harris Hip Score and rate of dislocation of imageless navigation versus conventional THA.

Results

Twenty-one studies (2706 procedures) were retrieved. Fifty-two percent of patients were women. There was between-group comparability at baseline in terms of age, body mass index (BMI), visual analogue scale, Harris Hip Score and leg length discrepancy (P > 0.1). Compared with conventional THA, the navigated group demonstrated slightly lower leg length discrepancy (P = 0.02) but longer duration of the surgical procedure (P < 0.0001). Cup anteversion (P = 0.6) and inclination (P = 0.5), Harris Hip Score (P = 0.1) and rate of dislocation (P = 0.98) were similar between the two interventions.

Conclusion

Imageless navigation may represent a viable option for THA.

Background

Total hip arthroplasty (THA) is considered one of the most effective and successful interventions in orthopaedics [1,2,3]. Alignment of the acetabular component and limb length equalization are essential for a successful THA. Cup inclination of 45° ± 10° and cup anteversion of 15° ± 10° are considered the safe zone by most surgeons [4, 5]. Malposition of the acetabular component increases the risk of dislocation, impingement, pelvic osteolysis, acetabular migration and acetabular lining wear [6,7,8,9]. Greater leg length discrepancy is associated with back pain, gait impairment, higher rate of aseptic loosening and patient dissatisfaction [9,10,11,12,13,14].

Imageless navigation system, a computer-assisted procedure, exploits three-dimensional sensors positioned during surgery to detect the anatomical features, limb axes and joint orientation, avoiding exposure to X-rays [15]. Imageless navigated THA is believed to be more accurate than other techniques, as the use of these sensors is believed to overcome parallax or operator pitfalls with fluoroscopy or change in pelvis position during the operation [16, 17]. However, whether imageless navigated THA is superior to the conventional procedure in terms of implant positioning and clinical and functional outcomes remains controversial [18,19,20,21,22]. Several studies have been recently published and had not yet been considered in previous meta-analyses. Therefore, a meta-analysis was conducted to compare imageless navigation versus conventional for primary THA in terms of implant positioning, surgical duration, leg length difference, Harris Hip Score and rate of dislocation.

Material and methods

Eligibility criteria

All the clinical trials comparing imageless navigation versus conventional THA were accessed. Only studies with levels I–III of evidence, according to the Oxford Centre of Evidence-Based Medicine [23], were eligible. Only studies published in peer-reviewed journals were considered. According to the authors’ language capabilities, articles in English, German, Italian, French and Spanish were eligible. Animal, in vitro, biomechanics, computational and cadaveric studies were not eligible. Reviews, opinions, letters and editorials were not considered. Clinical studies which reported data on revision THA were not included. Studies combining the interventions with innovative implants or materials, or experimental rehabilitation programmes, were not considered. Only studies which reported the outcomes of imageless navigation were suitable; other types of navigation methods [e.g. robotic, computed tomography (CT)-based] were not eligible. Only studies which reported quantitative data under the outcomes of interest were eligible.

Search strategy

This systematic review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) 2020 checklist [24]. The PICO algorithm was followed:

  • P (Population): end-stage hip osteoarthrosis;

  • I (Intervention): conventional THA;

  • C (Comparison): imageless navigated THA;

  • O (Outcomes): implant positioning, surgical duration, Harris Hip Score, dislocations.

In January 2022, the following databases were accessed: PubMed, Web of Science, Google Scholar and Embase. No time constraints were set for the search. The following keywords were used for the database search: hip, osteoarthritis, pain, replacement, arthroplasty, prosthesis, lower limb, leg discrepancy, anteversion, inclination, radiological, complications, dislocations, Harris Hip Score, PROMs, patient reported outcome measures.

Selection and data collection

Two authors (F.M. and F.C.) independently performed the database search. Titles and abstract of interest were screened. The full text of the articles of interest was accessed. The bibliography of the full-text articles was also screened for inclusion. Disagreements were debated, and the final decision was taken by N.M.

Data items

Data extraction was performed by two authors independently (F.M. and F.C.) (Table 1). The following generalities and patient demographics were collected: author and year, journal, study design, number of procedures, number of women, mean age and BMI, type of intervention and surgical approach. The following data were retrieved at last follow-up: mean cup inclination and anteversion, surgical duration, leg length discrepancy, Harris Hip Score [25] and rate of dislocation.

Table 1 Typology of data extracted at baseline, baseline and last follow-up (FU), and last FU

Methodological quality assessment

The risk of bias assessment was performed by two authors (F.M. and F.C.) independently. The Cochrane risk of bias tool (The Nordic Cochrane Collaboration, Copenhagen) was used. The following biases were evaluated: selection, detection, attrition, reporting, other source of biases.

Synthesis methods

The statistical analyses were performed by the main author (F.M.). For descriptive statistics, IBM SPSS version 25 was used. The Shapiro–Wilk test was performed to investigate data distribution. For parametric data, mean and standard deviation were evaluated. For non-parametric data, median and interquartile ranges were evaluated. Mean difference (MD) effect measure was adopted to assess baseline comparability. Student’s t-test and Mann–Whitney U test were performed for parametric and non-parametric data, with P values > 0.1 considered satisfactory. For the meta-analyses, Review Manager 5.3 software (The Nordic Cochrane Collaboration, Copenhagen) was used. For continuous data, the inverse variance with MD effect measure was adopted, while the Mantel–Haenszel method with odds ratio (OR) effect measure was used for dichotomic data. Heterogeneity was investigated using the Higgins I2 and χ2 tests. If χ2 < 0.05 and I2 > 75%, high heterogeneity was found. A fixed method effect model was used as default; if high heterogeneity was found, a random effect model was used. The confidence interval (CI) was set at 95% in all comparisons. Overall P values of < 0.05 were considered statistically significant.

Results

Study selection

The literature search resulted in 1456 articles. After removal of duplicates (N = 433), a further 984 articles were not eligible: non-comparative clinical trial (N = 571), study design (N = 219), experimental material/protocols (N = 84), other type of navigation system (N = 77), short length of follow-up (N = 18), not peer reviewed (N = 11) or language limitations (N = 4). Additionally 18 studies were excluded as they missed quantitative data under the endpoints of interest. Finally, 21 studies were included: 10 randomized clinical trials (RCTs) and 3 prospective and 8 retrospective cohort trials (Fig. 1). The time interval covered by the studies was from 2005 to 2018.

Fig. 1
figure 1

Flow chart of the literature search

Methodological quality assessment

The risk of bias graph evidenced moderate risk of selection bias, which arose from the retrospective nature of 8/21 of included studies (Fig. 2). Given the lack of blinding methods by most of the included studies, the risk of detection bias was moderate. Attrition and reporting biases were also moderate, as was the risk of other biases.

Fig. 2
figure 2

Methodological quality assessment

Risk of publication bias

To evaluate the risk of publication bias, the funnel plot of the most commonly reported outcome (cup anteversion) was evaluated. The plot evidenced fair symmetrical disposition of the referral points, which may indicate moderate risk of publication bias. However, most of the referral points are contained within the range of acceptability (Fig. 3).

Fig. 3
figure 3

Funnel plot of the most reported outcome (cup anteversion)

Study characteristics and results of individual studies

Overall, 2706 procedures were retrieved, of which 52% were in women. The mean age was 64.0 ± 4.2 years. The mean BMI was 27.7 ± 1.8 kg/m2. There was between-group comparability at baseline in terms of age, BMI, Harris Hip Score and leg length discrepancy (P > 0.1). Generalities and patient baseline of the included studies are shown in greater detail in Table 2.

Table 2 Generalities and patient baseline of the included studies; RCT, randomized clinical trial

Results of syntheses

Three studies compared the surgical duration [20, 26, 33]. The final effect was not significant (P = 0.1), indicating no difference between the two groups (Fig. 4).

Fig. 4
figure 4

Meta-analysis of the comparison: surgical duration

Cup anteversion has been evaluated by 15 studies [5, 18, 20, 27,28,29,30,31,32, 35,36,37,38]. The final effect was not significant (P = 0.6), indicating no difference between the two groups (Fig. 5).

Fig. 5
figure 5

Meta-analysis of the comparison: cup anteversion

Cup inclination has been evaluated by 14 studies [18, 20, 26,27,28,29,30,31,32, 35,36,37,38]. The final effect was not significant (P = 0.5), indicating no difference between the two groups (Fig. 6).

Fig. 6
figure 6

Meta-analysis of the comparison: cup inclination

Six studies compared leg length discrepancy [17, 26, 27, 32,33,34]. Leg length discrepancy was lower in the navigated group (MD −0.56; 95% CI −1.04 to −0.08; P = 0.02; Fig. 7).

Fig. 7
figure 7

Meta-analysis of the comparison: leg length discrepancy

Three studies compared the Harris Hip Score [17, 22, 33]. The final effect was not significant (P = 0.1), indicating no difference between the two groups (Fig. 8).

Fig. 8
figure 8

Meta-analysis of the comparison: Harris Hip Score

The rate of dislocation has been compared by four studies [17, 21, 26, 38]. The final effect was not significant (P = 0.98), indicating no difference between the two groups (Fig. 9).

Fig. 9
figure 9

Meta-analysis of the comparison: dislocation

Discussion

According to the endpoints evaluated in the present study, imageless navigation was not superior to the standard technique for primary THA. Although leg length discrepancy was significantly lower in imageless navigated THA, given its minimal difference, the clinical relevance of this finding is limited. Cup positioning, surgical duration, Harris Hip Score and rate of dislocation were similar between the two procedures. Snijders et al. [39] compared 255 versus 259 patients who underwent navigated versus freehand THA, respectively. The authors reported that navigated THA is more precise and exhibits an improved cup positioning accuracy [39] compared with the freehand group. Similarly, a meta-analysis on the accuracy of cup positioning revealed that imageless THA is preferable to traditional methods [40]. The present study found no evidence of greater accuracy implant in positioning in favour of the navigated THA. The present study expanded the focus also to other endpoints (implant positioning, surgical duration, Harris Hip Score, dislocations), but found no difference between the two modalities. These findings call into question the benefit of imageless THA, especially in terms of cost.

Although all the studies reported a longer surgical duration in the imageless navigated THA, the comparison was weighted by the high level of heterogeneity, and no statistically difference was found between the two groups. Imageless navigated THA is more time demanding, especially during the pre-operative phases [26]. The first incision is performed to place the optical tracking arrays in the iliac crest [26]. Additional time is required to position, drape and prep the patient again. Further, pelvic and acetabulum registration are the last steps which precede the beginning of the surgery [26]. In contrast, in conventional THA, the skin incision identified the start of the operation time [26]. This meta-analysis found similar cup anteversion between the two procedures. Several authors reported similar cup anteversion between the two THA groups [22, 27, 28]. Gurgel et al. [27] reported a greater anteversion of 17° in the THA navigated group compared with 15° of the conventional group. In contrast, Kalteis et al. [29] found 14° of anteversion in the imageless navigated group and 24° in the conventional THA group. Similar considerations can be made for cup inclination. Two authors reported approximately 3° of difference between the THA groups [28, 29]. Other authors reported similar cup positioning, with less than 0.5° of difference in inclination [30, 35, 37]. In contrast, Mainard et al. [32] reported a cup inclination of 44° in the imageless navigated cohort compared with 53° in the conventional THA. Leg length discrepancy was similar between the two techniques. However, given the high heterogeneity and the narrow spread of the result, the clinical relevance of this finding is uncertain. Leg length difference represents the absolute value of the difference between lines drawn through the inferior aspects of both lesser trochanters and the trans-ischial tuberosity line in the anteroposterior radiography of the lower pelvis [26, 41,42,43]. Licini et al. [17] reported an average leg length difference of 0.3 cm in the imageless navigated cohort versus 1.8 cm for the conventional THA, showing that leg length discrepancy was lower in the THA navigated group. However, they found no difference in patients’ perception of limb-length equality [17]. Similar results were evidenced by Manzotti et al. [33]. Although the mean pre-operative leg length discrepancy was similar between the two groups, the conventional THA showed a difference of +2.6 cm on early post-operative evaluation [33]. In contrast, other authors found no relevant difference between the two cohorts [26, 27, 34]. Three studies investigated the Harris Hip Score [17, 22, 33]. All studies agreed that the two techniques provide a similar Harris Hip Score at last follow-up [17, 22, 33]. Similar considerations can be made regarding the rate of dislocation, with no difference between imageless navigated and conventional THA [17, 26, 38].

The present study has some limitations. The limited number of clinical studies and relative limited number of procedures included for analysis represent the most important limitation. Further, the retrospective design of 38% (8 of 21) [5, 17, 19, 20, 26, 33, 34, 38] of the included studies is another important limitation. Given the limited available data in the literature, the analyses were conducted irrespective of the surgical access and the type of implant. The description of the surgical technique and post-operative rehabilitation was adequate in most of studies, whereas the sample size was often too small, and the eligibility criteria were barely reported and often biased in many of the included studies. Few studies reported data on the hip function and quality of life on long-term follow-up, and few reported the mean blood loss and the need for transfusion, which we suggest are other variables to investigate. Future high-quality studies are required to define the advantages of imageless navigation for THA. Given the lack of quantitative data, we were unable to include the rate of aseptic loosening, infection, impingement or component wear in our analysis. Optimal patient demographics at baseline is crucial to obtain reliable results. Patient selection is fundamental to conduct such studies and to minimize the risk of selection bias. Uncontrolled acute disease, such as infections or neoplasms, may have great influence on the outcome and generate heterogeneous results. The analyses were conducted irrespective of the surgical access (anterior, anterolateral, lateral, posterolateral, posterior) [44, 45]. This may generate inconsistencies [8, 14, 46]. Muscular damage or detachment, capsular repair and capsulotomy may have an influence on the surgical outcome [47,48,49]; however, given the lack of available data, these points were not possible to analyse separately. Given the lack of available data, surgical exposure (minimally or standard invasive), type of implant, cementation and post-operative protocol were not considered for analysis [9, 50,51,52]. Future investigations should overcome these limitations. For a better understanding of the potential of navigation surgery in imageless THA, future studies should investigate further radiological parameters, such as the femoral and acetabular offset as well as stem alignment. High-quality studies with longer follow-up would also be beneficial to investigate range of motion, reason for revision surgery and factors influencing the learning curve.

Conclusion

Imageless navigation may represent a viable option for primary THA. Compared with conventional THA, the navigated THA group demonstrated slightly lower leg length discrepancy but longer duration of the surgical intervention. Cup positioning, Harris Hip Score and dislocation rates were similar between the two interventions.

Availability of data and materials

The datasets generated during and/or analysed during the current study are available throughout the manuscript.

Abbreviations

THA:

Total hip arthroplasty

MD:

Mean difference

OR:

Odds ratio

CI:

Confidence interval

RCTs:

Randomized clinical trials

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FM: conception and design, interpretation of the data, drafting, final approval; NM: supervision, revision, final approval; FO: supervision, final approval; JE: conceptualisation, revision, final approval; FH: supervision, final approval; FC: drafting, final approval. All authors have agreed to the final version to be published and agree to be accountable for all aspects of the work. All authors read and approved the final manuscript.

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Migliorini, F., Cuozzo, F., Oliva, F. et al. Imageless navigation for primary total hip arthroplasty: a meta-analysis study. J Orthop Traumatol 23, 21 (2022). https://doi.org/10.1186/s10195-022-00636-9

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