KSRR  
Beta-Tricalcium Phosphate Block for Donor Site Morbidity of the Patella in Anterior Cruciate Ligament Reconstruction Using Bone-Patellar Tendon-Bone Graft
Yuki Kato, MD, PhD, Joverienne Chavez, MD, Shin Yamada, MD, Soichi Hattori, MD, Shuzo Takazawa, MD, and Hiroshi Ohuchi, MD, PhD
Department of Sports Medicine, Kameda Medical Center, Kamogawa, Japan
Correspondence to: Yuki Kato, MD, PhD
Department of Sports Medicine, Kameda Medical Center, 929 Higashicho, Kamogawa 296-8602, Japan
Tel: +81-4-7092-2211, Fax: +81-4-7099-1191
E-mail: kato.yuki.0@kameda.jp
Received: July 31, 2018; Revised: December 16, 2018; Accepted: January 18, 2019; Published online: March 18, 2019.
© Korean Knee Society. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Purpose: This study aimed to investigate anterior knee symptoms in patients who underwent anterior cruciate ligament (ACL) reconstruction using bone-patellar tendon-bone (BPTB) graft followed by implantation of a beta-tricalcium phosphate (β-TCP) block as a bone void filler.
Materials and Methods: We retrospectively reviewed 84 cases of synthetic bone grafting using a β-TCP block for the patellar bone defect in ACL reconstruction with a BPTB autograft. Computed tomography of the operated knee was performed immediately after the surgery to evaluate whether the grafted β-TCP block protruded forward from the anterior surface of the patella. On the basis of the results, the cases were divided into a protrusion group (n=31) and a non-protrusion group (n=53). Anterior knee symptoms at 12 months postoperatively and absorption of the grafted β-TCP block were compared between the two groups.
Results: Except for patellofemoral crepitus, there was no significant difference in anterior knee symptoms between the two groups (p>0.05). The incidence of patellofemoral crepitus was significantly lower in the protrusion group than in the non-protrusion group (p=0.027). The groups showed no significant difference in β-TCP absorption.
Conclusions: The present study demonstrated that the protrusion of β-TCP that was used as a bone void filler had no adverse effects.
Keywords: Knee, Anterior cruciate ligament, Reconstruction, Bone-patellar tendon-bone grafts, Beta-tricalcium phosphate block, Donor site morbidity


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