title: Tissue growth into porous primary and revision femoral stems.
abstract: The authors studied 45 uncemented porous-coated femoral stems from 45 patients: 35 primary total hip arthroplasties and 10 revisions of either cemented (7) or uncemented (3) femoral components. Histologic sections were examined quantitatively for type, amount, and distribution of tissue ingrowth; these findings were correlated with clinical and radiographic data. Fibrous tissue ingrowth predominated in both groups. Of the primary arthroplasty group, the grade of bone ingrowth in 8 specimens was none, 14 minimal, 6 moderate, and 7 more extensive. In the revision cases, the grade of bone ingrowth in 5 was none, 3 minimal, and 2 moderate. Bone ingrowth was seen more frequently in the distal porous coating, particularly in the revision cases, and most often where direct stem-endosteal canal contact had occurred. While bone ingrowth can occur in uncemented revision stems, it generally appears less abundantly than in primary total hip arthroplasty.
authors.affiliation: Department of Orthopaedic Surgery, Tulane University School of Medicine, New Orleans, LA 70112.
authors.forename: S D
authors.initials: SD
authors.lastname: Cook
authors.forename: R L
authors.initials: RL
authors.lastname: Barrack
authors.forename: K A
authors.initials: KA
authors.lastname: Thomas
authors.forename: R J
authors.initials: RJ
authors.lastname: Haddad
mesh_terms: D000328:Adult; D000368:Aged; D002484:Cementation; D005260:Female; D006622:Hip Prosthesis / Q000379:methods; D006801:Humans; D008297:Male; D008875:Middle Aged; D016348:Osseointegration / Q000502:physiology*; D010003:Osteoarthritis / Q000473:pathology* / Q000601:surgery; D012086:Reoperation