The rationale for cementless total hip replacement.
Current cementing techniques of distal plugging, pulsatile water cleaning of the canal, and retrograde filling with PMMA in a low-viscous state prepared using porosity reduction techniques and then pressurized have been shown to give excellent results at 10 or more years after operation. However, physical and aging characteristics of PMMA do not guarantee that those results will hold up in the 20- to 30-year time frame. Fifteen-year experience with bony ingrowth systems indicate the development of a durable interface without PMMA, although the interface does appear more vulnerable to attack by the biologic reaction to HMWPE debris. Bone remodeling appears more favorable around proximally fixed bone ingrowth prostheses than around distally fixed prostheses. Softening of the physical characteristics of the stem tip may reduce the incidence of thigh pain. Patients with high activity potential and a life expectancy of greater than 25 years should be strongly considered for a proximally fixed bone ingrowth or ongrowth prosthesis.
Hungerford
D S
DS
Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland.
Jones
L C
LC
D000328:Adult; D000368:Aged; D016723:Bone Remodeling; D001862:Bone Resorption / Q000209:etiology / Q000503:physiopathology; D005500:Follow-Up Studies; D005544:Forecasting; D006622:Hip Prosthesis; D006801:Humans; D008768:Methylmethacrylates; D008875:Middle Aged; D010014:Osteolysis / Q000209:etiology / Q000503:physiopathology; D011095:Polyethylenes; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013997:Time Factors
D008768:Methylmethacrylates; D011095:Polyethylenes