Randomised controlled trials (RCTs) that compared porous-coated femoral components with or without hydroxyapatite coating of identical geometry in primary uncemented total hip arthroplasty were eligible for inclusion. Only studies that assessed objective and validated clinical and radiographic outcomes were considered.
Included studies evaluated a varied number of hydroxyapatite-coated and porous-coated hips (range 28 to 318). Follow-up periods ranged from one to 10.5 years. Prostheses used were varied. Most patients were male and their mean age ranged from 45 to 64 years. Outcomes evaluated included: Harris Hip Score; Postel d’Aubigne; and a variety of radiographic outcomes, such as subsidence, radioactive lines and endosteal bone ingrowth (Spot Welds).
Two reviewers independently assessed studies for inclusion. Disagreements were resolved through discussion or referral to a third reviewer.