title: Quantitative Assessment of Tendon Healing by Using MR T2 Mapping in a Rabbit Achilles Tendon Transection Model Treated with Platelet-rich Plasma.
abstract: OBJECTIVE
  To determine if magnetic resonance (MR) imaging T2 mapping can be used to quantify histologic tendon healing by using a rabbit Achilles tendon transection model treated with platelet-rich plasma (PRP).
  
  
  METHODS
  Experiments were approved by the Institutional Animal Care and Use Committee. The Achilles tendons of 24 New Zealand white rabbits (48 limbs) were surgically transected, and PRP (in the test group) or saline (in the control group) was injected into the transection site. The rabbits were sacrificed 2, 4, 8, and 12 weeks after surgery. Thereafter, T2 mapping and histologic evaluations were performed by using the Bonar scale. A mixed-model multivariate analysis of variance was used to test the effects of time and PRP treatment on the T2 value and Bonar grade, respectively. The correlation between the T2 value and Bonar grade was also assessed by using the Spearman correlation coefficient.
  
  
  RESULTS
  The Bonar scale values decreased in both groups during tendon healing. The T2 value also shortened over time (P < .001 for both groups). The T2 values were positively correlated with the Bonar grade (ρ = 0.78, P < .001). Both the T2 value and Bonar scale value were lower in the PRP group than in the control group at 4, 8, and 12 weeks; however, there was no significant effect of PRP treatment on the T2 value or Bonar grade.
  
  
  CONCLUSIONS
  The T2 value changes reflected histologic tendon healing. While T2 and Bonar grade were lower at all time points in tendons treated with PRP, there was no significant difference between the treatment and control tendons.
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Taisuke
authors: T
authors: Fukawa
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Satoshi
authors: S
authors: Yamaguchi
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Atsuya
authors: A
authors: Watanabe
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Takahisa
authors: T
authors: Sasho
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Ryuichiro
authors: R
authors: Akagi
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Yuta
authors: Y
authors: Muramatsu
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Yorikazu
authors: Y
authors: Akatsu
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Joe
authors: J
authors: Katsuragi
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Jun
authors: J
authors: Endo
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Fumio
authors: F
authors: Osone
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Yasunori
authors: Y
authors: Sato
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Toshiyuki
authors: T
authors: Okubo
authors: From the Department of Orthopaedic Surgery, Graduate School of Medical and Pharmaceutical Sciences (T.F., S.Y., A.W., T.S., R.A., Y.M., Y.A., J.K., J.E., K.T.), and Clinical Research Center (Y.S.), Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; and Department of Radiology, Chiba Medical Center, Teikyo University, Ichihara, Japan (F.O., T.O.).
authors: Kazuhisa
authors: K
authors: Takahashi
mesh_terms: D000125:Achilles Tendon / Q000293:injuries* / Q000502:physiology*; D000818:Animals; D005069:Evaluation Studies as Topic; D005260:Female; D008279:Magnetic Resonance Imaging / Q000379:methods*; D023421:Models, Animal; D053657:Platelet-Rich Plasma; D011817:Rabbits; D012421:Rupture; D014945:Wound Healing