title: A randomized clinical trial comparing intralesional bone marrow and steroid injections for simple bone cysts.
abstract: BACKGROUND
  Simple bone cysts are common benign lesions in growing children that predispose them to fracture and are sometimes painful. The purpose of this trial was to compare rates of healing of simple bone cysts treated with intralesional injections of bone marrow with rates of healing of those treated with methylprednisolone acetate.
  
  
  METHODS
  Of ninety patients randomly allocated to treatment with either a bone-marrow or a methylprednisolone acetate injection, seventy-seven were followed for two years. The primary outcome, determined by a radiologist who was blind to the type of treatment, was radiographic evidence of healing. The cyst was judged to be either not healed (grade 1 [a clearly visible cyst] or grade 2 [a cyst that was visible but multilocular and opaque]) or healed (grade 3 [sclerosis around or within a partially visible cyst] or grade 4 [complete healing with obliteration of the cyst]). Patient function was assessed with use of the Activity Scale for Kids, and pain was assessed with the Oucher Scale.
  
  
  RESULTS
  Sixteen (42%) of the thirty-eight cysts treated with methylprednisolone acetate healed, and nine (23%) of the thirty-nine cysts treated with bone marrow healed (p = 0.01). There was no significant difference between the treatment groups (p > 0.09) with respect to function, pain, number of injections, additional fractures, or complications.
  
  
  CONCLUSIONS
  Although the rate of healing of simple bone cysts was low following injection of either bone marrow or methylprednisolone, the latter provided superior healing rates.
authors.affiliation: Department of Surgery, The Hospital for Sick Children, 1218-555 University Avenue, Toronto, ON M5G 1X8, Canada. james.wright@sickkids.ca
authors.forename: James G
authors.initials: JG
authors.lastname: Wright
authors.forename: Suzanne
authors.initials: S
authors.lastname: Yandow
authors.forename: Sandra
authors.initials: S
authors.lastname: Donaldson
authors.forename: Lisa
authors.initials: L
authors.lastname: Marley
mesh_terms: D000893:Anti-Inflammatory Agents / Q000008:administration & dosage*; D001845:Bone Cysts / Q000628:therapy*; D016026:Bone Marrow Transplantation / Q000379:methods*; D002648:Child; D006801:Humans; D015552:Injections, Intralesional; D008775:Methylprednisolone / Q000008:administration & dosage / Q000031:analogs & derivatives*; D000077555:Methylprednisolone Acetate; D011446:Prospective Studies; D016896:Treatment Outcome; D014945:Wound Healing / Q000187:drug effects
chemical_list: D000893:Anti-Inflammatory Agents; D000077555:Methylprednisolone Acetate; D008775:Methylprednisolone