Clinical efficacy and safety of closed reduction versus in situ internal fixation for valgus-impacted femoral neck fractures: A meta-analysis.

OBJECTIVES

In this meta-analysis, we discuss the clinical efficacy of closed reduction with in situ fixation for valgus-impacted femoral neck fractures (VIFNFs) by contrasting postoperative functional recovery and complication profiles.

MATERIALS AND

METHODS

We performed a systematic literature search in PubMed, Embase, Web of Science, the Cochrane Library, and ScienceDirect for publications up to October 2025. The search targeted original studies which directly compared the surgical outcomes of closed reduction and in situ internal fixation for valgus-impacted femoral neck fractures. Search terms included combinations of: valgus-impacted (or valgus impaction), femoral neck fracture, in situ, reduction, and internal fixation. Pooled data were analyzed using mean differences (MD) with 95% confidence intervals (CIs) for continuous outcomes and risk differences (RD) with 95% CIs for dichotomous outcomes.

RESULTS

The final analysis included a total of 447 patients extracted from five studies that met the predetermined inclusion criteria. The meta-analysis demonstrated that the closed reduction group exhibited a statistically significant reduction in postoperative femoral neck shortening (FNS) compared with the in situ fixation group (MD: 4.05; 95% CI: 2.68 ~ 5.42; p < 0.00001). For the caput-collum-diaphysis (CCD) angle, the closed reduction group showed a borderline significant improvement relative to the in situ fixation group (MD: 9.79; 95% CI: 0.19 ~ 19.39; p = 0.05). The in situ fixation group was associated with a substantially lower reoperation rate (RD: -0.08; 95% CI: -0.16 ~ -0.01; p = 0.04). No statistically significant intergroup differences were detected for the Harris Hip Score (HHS) (MD: -4.13; 95% CI: -9.37 ~ 1.11; p = 0.12), incidence of femoral head necrosis (RD: -0.05; 95% CI: -0.14 ~ 0.05; p = 0.36), or fixation failure rate (RD: -0.05; 95% CI: -0.17 ~ 0.06; p = 0.37).

CONCLUSION

Closed reduction yields a statistically significant advantage in reducing postoperative FNS and a borderline significant benefit in maintaining the CCD. In contrast, in situ fixation is associated with a lower reoperation rate. The two strategies show comparable outcomes for the HHS, femoral head necrosis incidence, and fixation failure rate. Thus, surgical approach should be individualized based on patient-specific profiles.