title: Rebound growth after hemiepiphysiodesis: An animal-based experimental study of incidence and chronology.
abstract: Rebound growth after hemiepiphysiodesis may be a normal event, but little is known about its causes, incidence or factors related to its intensity. The aim of this study was to evaluate rebound growth under controlled experimental conditions. A total of 22 six-week-old rabbits underwent a medial proximal tibial hemiepiphysiodesis using a two-hole plate and screws. Temporal growth plate arrest was maintained for three weeks, and animals were killed at intervals ranging between three days and three weeks after removal of the device. The radiological angulation of the proximal tibia was studied at weekly intervals during and after hemiepiphysiodesis. A histological study of the retrieved proximal physis of the tibia was performed. The mean angulation achieved at three weeks was 34.7° (standard deviation (sd) 3.4), and this remained unchanged for the study period of up to two weeks. By three weeks after removal of the implant the mean angulation had dropped to 28.2° (sd 1.8) (p < 0.001). Histologically, widening of the medial side was noted during the first two weeks. By three weeks this widening had substantially disappeared and the normal columnar structure was virtually re-established. In our rabbit model, rebound was an event of variable incidence and intensity and, when present, did not appear immediately after restoration of growth, but took some time to appear.
authors.affiliation: Hospital Universitari Son Espases, Crta de Valldemosa 79, 07120 Palma de Mallorca, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Corominas-Frances
authors.affiliation: Hospital Universitari Son Espases, Crta de Valldemosa 79, 07120 Palma de Mallorca, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Sanpera
authors.affiliation: Hospital Universitari Son Espases, Crta de Valldemosa 79, 07120 Palma de Mallorca, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Saus-Sarrias
authors.affiliation: Hospital Son Llatzer, Crta de Manacor km4. 07198 Palma de Mallorca, Spain.
authors.forename: S
authors.initials: S
authors.lastname: Tejada-Gavela
authors.affiliation: Hospital Universitari Son Espases, Crta de Valldemosa 79, 07120 Palma de Mallorca, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Sanpera-Iglesias
authors.affiliation: Hospital Universitari Son Espases, Crta de Valldemosa 79, 07120 Palma de Mallorca, Spain.
authors.forename: G
authors.initials: G
authors.lastname: Frontera-Juan
mesh_terms: D000818:Animals; D001846:Bone Development / Q000502:physiology*; D004838:Epiphyses / Q000502:physiology / Q000503:physiopathology / Q000601:surgery*; D005260:Female; D006132:Growth Plate / Q000502:physiology / Q000601:surgery*; D023421:Models, Animal; D019637:Orthopedic Procedures / Q000295:instrumentation; D010027:Osteotomy / Q000379:methods; D011184:Postoperative Period; D011446:Prospective Studies; D011817:Rabbits; D011859:Radiography; D013977:Tibia / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*
keywords: Angular deformity; Animal; Hemiepiphysiodesis; Rebound growth