BACKGROUND: Although many studies have evaluated the success of porous tantalum component in primary and revision cementless total knee arthroplasty (TKA) cases, few studies have reported the breakage of porous tantalum monoblock patella component (PTMP). The purpose of this study was to investigate the radiographic outcomes of breakage of PTMP at short-term follow up. METHODS: This was a retrospective study of 49 consecutive knees in 43 patients who underwent TKA surgery between September 2012 and March 2014. Bone marrow contents/tissue volumes (BMC/TV. mg/cm3) were evaluated using 2-dimensional osteomorphometry software with 2D- multi-detector-row computed tomography (2D-MDCT) to measure fixation of the bone-prosthesis interface with patella at 6, 12, and 24 months after surgery. Clinical follow up was obtained by reviewing each patient at orthopedic record. RESULTS: We experienced a case that resulted in breakage of PTMP without traumatic episode at 26 months after surgery. Relative changes of Bone Mineral Contents per Tissue Volume. (BMC/TV mg/cm3) at ROI. 1 (superior border of the patella) and ROI. 2 (peg of patella) were significantly higher than ROI.3 (inferior border of patella) at 6, 12 and 24 months after surgery (p < 0.001. p < 0.01). Patient with breakage of PTMP has patella baja (Insall- Salvati ratio: 0.72), and the relative change of BMC/TV at ROI.1 and 2 for patients who experienced a breakage of PTMP was higher than any other patients. CONCLUSION: The present study revealed that the use of PTMP should be avoided for patients with patella baja.
BACKGROUND: Although many studies have evaluated the success of porous tantalum component in primary and revision cementless total knee arthroplasty (TKA) cases, few studies have reported the breakage of porous tantalum monoblock patella component (PTMP). The purpose of this study was to investigate the radiographic outcomes of breakage of PTMP at short-term follow up. METHODS: This was a retrospective study of 49 consecutive knees in 43 patients who underwent TKA surgery between September 2012 and March 2014. Bone marrow contents/tissue volumes (BMC/TV. mg/cm3) were evaluated using 2-dimensional osteomorphometry software with 2D- multi-detector-row computed tomography (2D-MDCT) to measure fixation of the bone-prosthesis interface with patella at 6, 12, and 24 months after surgery. Clinical follow up was obtained by reviewing each patient at orthopedic record. RESULTS: We experienced a case that resulted in breakage of PTMP without traumatic episode at 26 months after surgery. Relative changes of Bone Mineral Contents per Tissue Volume. (BMC/TV mg/cm3) at ROI. 1 (superior border of the patella) and ROI. 2 (peg of patella) were significantly higher than ROI.3 (inferior border of patella) at 6, 12 and 24 months after surgery (p < 0.001. p < 0.01). Patient with breakage of PTMP has patella baja (Insall- Salvati ratio: 0.72), and the relative change of BMC/TV at ROI.1 and 2 for patients who experienced a breakage of PTMP was higher than any other patients. CONCLUSION: The present study revealed that the use of PTMP should be avoided for patients with patella baja.
Entities:
Keywords:
2D-MDCT, two-dimensional multi-detector-row computed tomography; 2D-multi-detector-row computed tomography; AP, anteroposterior; BMC/TV, bone mineral contents per tissue volume; BMD, bone mineral density; BMI, body mass index; BV, bone volume; Breakage; CT, computed tomography; PTMP, porous tantalum monoblock patella; Porous tantalum monoblock patella component; ROI, regions of interest; TKA, total knee arthroplasty; TV, total volume; Total knee arthroplasty; UHMWPE, ultra high molecular weight polyethylene)
Authors: William A Manning; Kanishka Ghosh; Alasdair Blain; Lee Longstaff; David John Deehan Journal: Knee Surg Sports Traumatol Arthrosc Date: 2016-03-31 Impact factor: 4.342
Authors: Ivan De Martino; Vincenzo De Santis; Peter K Sculco; Rocco D'Apolito; Joseph B Assini; Giorgio Gasparini Journal: Clin Orthop Relat Res Date: 2015-05-13 Impact factor: 4.176
Authors: Paul F Lachiewicz; Michael P Bolognesi; Robert A Henderson; Elizabeth S Soileau; Thomas Parker Vail Journal: Clin Orthop Relat Res Date: 2012-01 Impact factor: 4.176