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Tomasz Poboży

Are Routine Movement Restrictions Necessary After Hip Replacement?

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Tomasz Poboży

Polish version: Czy po endoprotezie biodra potrzebne są rutynowe ograniczenia ruchu?

After primary posterior-approach total hip arthroplasty, should patients routinely avoid flexion beyond 90°, adduction across the midline and internal rotation for six weeks? A large randomised trial in The Journal of Arthroplasty found no detectable reduction in dislocation risk from this set of precautions when the posterior capsule and soft tissues were repaired.

Why does this study matter?

Routine hip precautions are a longstanding component of care after posterior-approach total hip arthroplasty (THA). They can make everyday activities harder, increase fear of movement and delay recovery of confidence, while their effect on dislocation has remained uncertain. The trial by Yadav and colleagues is valuable particularly because of its randomised design and large sample: 1,133 patients were analysed.

Research question and methods

This prospective randomised trial was conducted at Rush University Medical Center and affiliated surgical centres in the United States. All patients underwent a posterior approach with posterior soft-tissue repair. After surgery, they were allocated to one of two groups:

  • No routine restrictions: 567 patients, with no prohibitions on specific movements or activities.
  • Standard precautions: 566 patients, instructed to avoid hip flexion >90°, adduction across the midline and internal rotation for six weeks.

The primary outcome was dislocation. Complications, revisions, Hip disability and Osteoarthritis Outcome Score for Joint Replacement (HOOS JR) and return to work were also assessed. Mean follow-up was 1.3 years. Adherence to precautions at six weeks was 92.9% in the restricted group.

Main findings

  • There were 10 dislocations overall (0.88%): four without restrictions and six with precautions.
  • The difference was not statistically significant: OR 0.60; 95% CI 0.17–2.17; p = 0.547.
  • There were no differences in 90-day complications or revisions.
  • HOOS JR was statistically higher without restrictions at six weeks (76.78 versus 74.48; p = 0.028) and at 3–6 months (84.60 versus 81.54; p = 0.015).
  • At one year, the HOOS JR difference was not significant (87.74 versus 85.64; p = 0.107).
  • Return-to-work rates did not differ significantly.

Clinical interpretation for an orthopaedic surgeon

The result is specific: after primary posterior-approach THA with capsular repair and standard soft-tissue reconstruction, six weeks of routine conventional precautions did not produce a detectable reduction in dislocation risk. It is not a statement that movement never needs to be restricted after THA.

Early HOOS JR differences favoured unrestricted movement and were statistically significant, but their magnitude was small. They should not automatically be interpreted as a large clinical functional advantage. The more notable finding was the absence of an observed protective effect of precautions, with a very low overall dislocation rate.

Limitations

  • The trial was conducted within one specialist clinical system.
  • Dislocations were uncommon, resulting in a wide confidence interval for the effect.
  • The findings concern primary posterior-approach THA with capsular repair. They should not automatically be applied to revision surgery, absent soft-tissue repair or other high-risk situations.
  • Anatomy, muscle control, the indication for surgery, implant characteristics and neurological factors may still affect instability risk.

Implications for practice and remaining uncertainty

The study strengthens the argument against prescribing the same automatic set of restrictions to every patient after uncomplicated primary posterior-approach THA with appropriate soft-tissue repair. It may support more individualised postoperative care.

It does not establish that all movement-related advice can be abandoned for every patient. Intraoperative instability, revision surgery, particular implant designs, neurological disorders and other risk factors may require different recommendations.

References

Yadav AS, Potluri AS, Dandamudi S, Singh H, DeBenedetti A, Behery OA, Levine BR. Do Hip Precautions Matter After Posterior Approach Total Hip Arthroplasty With Capsular Repair? A Randomized Control Trial. J Arthroplasty. 2026;41(9 Suppl 1):S324-S328. Published online 27 April 2026; issue publication September 2026. DOI: 10.1016/j.arth.2026.04.080. PMID: 42055222. The full text is openly available from The Journal of Arthroplasty.

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For Doctors and Physiotherapists · Research Updates, Literature and Evidence-Based Medicine

Content prepared by: Tomasz Poboży - orthopaedic surgeon.

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