Three-dimensional-printed custom-made patellar endoprosthesis for recurrent giant cell tumor of the patella: A case report and review of the literature

Table 1 Literature review of patellectomy for giant cell tumor

Ref.	No. of patients	Ennecking stage	Follow-up (yr)	Reconstruction	Clinical outcomes	Complications
Mercuri et al[17]	4	3	Average 18.5	Not mentioned	All had full motion; no instability; no limping	One local recurrence underwent amputation
Agarwal et al[18]	9	3	Average 5.3	Five had free fascia lata strip graft	Extensor lag of 10°-20°; average active ROM 80°	Benign pulmonary metastasis
Malhotra et al[5]	1	3	3	Patella bone tendon allograft	Knee ROM 80°; no extensor lag; no pain	-
Görmeli et al[19]	1	3	1	Achilles allograft	ROM 110º flexion; strength loss 51.1% in extensor and 21.1% in flexor	-
Tripathy et al[6]	1	3	2	End-to-end repair of quadriceps to the patellar tendon	ROM 130º; normal gait	No local recurrence or distant metastasis

ROM: Range of motion.