BACKGROUND: Bone morphogenetic proteins (BMPs) have the potential to improve incorporation of allograft bone in revision surgery. This could result in improved fixation and graft incorporation. PATIENTS AND METHODS: We evaluated the effect of mixing OP-1 (BMP-7) with morselized allograft in hip revisions. In a case-control study, 20 acetabular revisions (10 in the study group, 10 controls) and 41 femoral revisions (11 in study group, 30 controls) were done using impaction allografting. The migration of the cups and stems was studied with radiostereometric analysis (RSA) for up to 5 years. Changes of bone mineral density around the femoral component were measured with dual energy X-ray adsorptiometry for 2 years. Bone remodeling and the extent of radiolucent lines were evaluated on conventional radiographs after 5 years. The clinical results were documented using Harris hip score. RESULTS: In the cup study, there was no significant difference in implant migration between the study and control groups. 4 sockets in the study group were classified as radiographically loose after 5 years and 2 of them were revised after 5 years. After 2 years, the stems in the study group showed slightly increased posterior tilt (0.3 degrees , p = 0.03). 1 stem in the study group loosened and was revised during the third year of observation. INTERPRETATION: The sample size and study design in our evaluation did not allow any firm conclusions. Absence of any trend to improved fixation and early revisions in the study group prompted us to stop recruitment to this study.
BACKGROUND: Bone morphogenetic proteins (BMPs) have the potential to improve incorporation of allograft bone in revision surgery. This could result in improved fixation and graft incorporation. PATIENTS AND METHODS: We evaluated the effect of mixing OP-1 (BMP-7) with morselized allograft in hip revisions. In a case-control study, 20 acetabular revisions (10 in the study group, 10 controls) and 41 femoral revisions (11 in study group, 30 controls) were done using impaction allografting. The migration of the cups and stems was studied with radiostereometric analysis (RSA) for up to 5 years. Changes of bone mineral density around the femoral component were measured with dual energy X-ray adsorptiometry for 2 years. Bone remodeling and the extent of radiolucent lines were evaluated on conventional radiographs after 5 years. The clinical results were documented using Harris hip score. RESULTS: In the cup study, there was no significant difference in implant migration between the study and control groups. 4 sockets in the study group were classified as radiographically loose after 5 years and 2 of them were revised after 5 years. After 2 years, the stems in the study group showed slightly increased posterior tilt (0.3 degrees , p = 0.03). 1 stem in the study group loosened and was revised during the third year of observation. INTERPRETATION: The sample size and study design in our evaluation did not allow any firm conclusions. Absence of any trend to improved fixation and early revisions in the study group prompted us to stop recruitment to this study.
Authors: Jorgen Baas; Marianne Vestermark; Thomas Jensen; Joan Bechtold; Kjeld Soballe; Thomas Jakobsen Journal: Bone Date: 2017-01-07 Impact factor: 4.398
Authors: Gerjon Hannink; Ester Piek; Jose M A Hendriks; Peter M Van der Kraan; B Willem Schreurs; Pieter Buma Journal: Int Orthop Date: 2008-01-16 Impact factor: 3.075
Authors: Vasilis Zampelis; Magnus Tägil; Lars Lidgren; Hanna Isaksson; Isam Atroshi; Jian-Sheng Wang Journal: J Orthop Surg Res Date: 2013-07-31 Impact factor: 2.359