Multicentric and prospective study of the Summit cementless stem.
We assess early clinical and radiographic results of a multicentric and prospective study of 485 Summit porous-coated stems implanted in 5 hospitals. Of the patients, 171 had a hydroxyapatite (HA) coating and 314 had non-HA porous-coated stems. The mean follow-up was 4.2 years (range 2.5-6 years). The median size of the stem was 5. A standard femoral offset stem was used in 366 hips (75.5%) and a high femoral offset in 119 hips (24.5%). Dislocation was the most frequent postoperative complication (16 hips). Clinical results according to the Harris scale were 30.17 points (range 10-52) before surgery and 95 points (range 90-100) at the last follow-up evaluation. All stems were radiographically osseointegrated. Femoral stem position was neutral in 395 hips (81.4%), and femoral canal filling was related with implant position. No stem subsidence greater than 5 mm has been found in any hip. No osteolysis was found around the femoral stem. No differences have been found between HA coating and non-HA porous-coated stems. Although the present follow-up in this series is too short to allow definite conclusions, the Summit stem with and without HA coating has provided excellent short-term results.
Orthopaedic Department, Hospital La Paz, Madrid, Spain. gcimbrelo@yahoo.es
Eduardo
E
García-Cimbrelo
Antonio
A
Bru-Pomer
Boris
B
García-Benítez
Moisés
M
Hernández-Blanco
Javier
J
Vaquero
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D020099:Coated Materials, Biocompatible; D005260:Female; D005269:Femur / Q000601:surgery*; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013997:Time Factors; D016896:Treatment Outcome; D055815:Young Adult
D020099:Coated Materials, Biocompatible