Weekly injection of teriparatide for bone ingrowth after cementless total knee arthroplasty.
To compare bone mineral density (BMD) in patients with or without weekly injection of teriparatide to promote bone ingrowth after cementless total knee arthroplasty (TKA).



Records of 8 men and 32 women (mean age, 75.6 years) who underwent cementless TKA for medial knee osteoarthritis with (n=20) or without (n=20) once-weekly subcutaneous/hypodermic injection of teriparatide for 48 weeks were reviewed. BMD and bone volume/total volume (BV/TV) of the bone-prosthesis interface of the proximal tibia in 6 regions of interest (ROI) were assessed at 3, 6, 9, and 12 months using multi-detector computed tomography.



Patients with or without weekly injection of teriparatide after cementless TKA were comparable in terms of baseline characteristics and pre- and post-operative knee range of motion and Knee Society knee and function scores. In ROI 1 (medial), ROI 3 (anteromedial), and ROI 4 (posteromedial), the BV/TV increased throughout the postoperative period in patients with weekly injection of teriparatide and declined after 6 months in patients without weekly injection of teriparatide. These 3 ROIs of the 2 groups differed significantly only in BMD at 6, 9, and 12 months. In ROI 2 (lateral), ROI 5 (anterolateral), and ROI 6 (posterolateral), both BV/TV and BMD showed a decreasing trend, and these 3 ROIs of the 2 groups did not differ significantly.



Weekly injection of teriparatide after cementless TKA promoted bone ingrowth mostly in the medial aspect of the bone-prosthesis interface.
Department of Orthopaedic Surgery, Toho University School of Medicine, Tokyo, Japan.
T
T
Kaneko
Department of Orthopaedic Surgery, Toho University School of Medicine, Tokyo, Japan.
T
T
Otani
Department of Orthopaedic Surgery, Toho University School of Medicine, Tokyo, Japan.
N
N
Kono
Department of Orthopaedic Surgery, Toho University School of Medicine, Tokyo, Japan.
Y
Y
Mochizuki
Department of Orthopaedic Surgery, Toho University School of Medicine, Tokyo, Japan.
T
T
Mori
Ratoc System Engineering Co. Ltd., Tokyo, Japan.
N
N
Nango
Department of Orthopaedic Surgery, Toho University School of Medicine, Tokyo, Japan.
H
H
Ikegami
Department of Orthopaedic Surgery, Toho University School of Medicine, Tokyo, Japan.
Y
Y
Musha
D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee; D015519:Bone Density; D050071:Bone Density Conservation Agents / Q000008:administration & dosage*; D004334:Drug Administration Schedule; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D012189:Retrospective Studies; D019379:Teriparatide / Q000008:administration & dosage*
D050071:Bone Density Conservation Agents; D019379:Teriparatide
arthroplasty, replacement, knee; bone density; teriparatide