title: Activity level in young patients with primary total hip arthroplasty: a 5-year minimum follow-up.
abstract: Increased activity level after total hip arthroplasty (THA) is considered a risk factor for early prosthetic failure in young patients. Forty-one primary total hip arthroplasties in 34 patients were evaluated. Walking activity was measured using a pedometer to record gait cycles. Patients completed a University of California, Los Angeles (UCLA) activity questionnaire. Linear wear rates were measured. Mean ages at surgery and final follow-up were 42 and 50.3 years, respectively (mean gait cycles per year, 1.2 million; mean UCLA score, 6; mean linear wear, 0.16 mm/y). Increased body mass index and age correlated with decreased gait cycles per year. Patients with systemic disease were less active than patients with localized hip conditions. Femoral head diameter was a predictor of linear wear. The average gait cycles per year and wear rate for this population do not appear accelerated relative to average values reported in older populations.
authors.affiliation: Department of Orthopaedic Surgery, The University of Minnesota, Minneapolis, Minnesota, USA.
authors.forename: V Franklin
authors.initials: VF
authors.lastname: Sechriest
authors.forename: Richard F
authors.initials: RF
authors.lastname: Kyle
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Marek
authors.forename: Jesse D
authors.initials: JD
authors.lastname: Spates
authors.forename: Khaled J
authors.initials: KJ
authors.lastname: Saleh
authors.forename: Michael
authors.initials: M
authors.lastname: Kuskowski
mesh_terms: D000328:Adult; D000367:Age Factors; D019644:Arthroplasty, Replacement, Hip; D015992:Body Mass Index; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D011095:Polyethylenes; D011446:Prospective Studies; D011475:Prosthesis Failure; D012189:Retrospective Studies; D012307:Risk Factors; D012727:Sex Characteristics; D016138:Walking / Q000502:physiology
chemical_list: D011095:Polyethylenes