Staged bilateral total hip arthroplasty using rough and smooth surface femoral stems with similar design: 10-year survivorship of 48 cases

Figures & data

Figure 1. Kaplan-Meier curve for the Charnley (top curve) and Harvard (bottom curve) femoral stems using revision for aseptic loosening as an endpoint. (Numbers in parentheses indicate the events occurring at that point in time).

Comparison of cement mantle thickness in the Harvard and Charnley groups. Values are the number of hips with cement mantle thickness of greater than 2 mm (%)

	Harvard group	Charnley group
Acetabular region 1	37 (77)	36 (75)
Acetabular region 2	30 (62)	29 (60)
Acetabular region 3	43 (90)	46 (95)
Femoral region 1	43 (90)	44 (92)
Femoral region 2	17(35)	11 (22)
Femoral region 3	12 (25)	14(30)
Femoral region 4	23 (47)	23 (47)
Femoral region 5	28 (57)	26 (55)
Femoral region 6	44 (92)	36 (75)
Femoral region 7	46 (95)	46 (95)

Figure 2. Radiograph showing gross loosening of Harvard femoral stem after 7 years in a patient with bilateral hip arthroplasty (a: Charnley stem, asymptomatic; b: Harvard stem, showing osteolysis and loosening).