PURPOSE: The objective of this study was to compare the outcome of constrained and unconstrained primary total knee arthroplasty (TKA) in the management of the valgus deformity. METHODS: This is a retrospective review of patients with type II valgus knee who underwent primary TKA from 1999 to 2011. There were fifty patients in Group 1 who underwent varus-valgus constrained TKA. They were matched with another fifty patients in Group 2 who underwent unconstrained TKA. RESULTS: The mean joint line shift was significantly higher in Group 1 (+8 mm, SD 6 mm) than in Group 2 (+2 mm, SD 3 mm) (p = 0.03). At 2 years, there was no difference in anterior-posterior stability and mediolateral stability according to the Knee Society Score, and patients in Group 2 reported significantly better mean function score of 66.2 (SD 9.3) (mean 48, SD 7.1 in Group 1) (p = 0.002). Two patients (6 %) in Group 1 underwent revision surgery--one for a broken central peg and the other for aseptic loosening. Three patients (2 %) in Group 2 underwent revision surgery--two for global instability and one for poly wear. The estimated survivorship time was 8.3 years for constrained TKA and 12.0 for unconstrained TKA. CONCLUSION: Constrained TKA was associated with more significant joint line changes for the management of valgus arthritic knee, when compared with unconstrained TKA. LEVEL OF EVIDENCE: Retrospective study, Level III.
PURPOSE: The objective of this study was to compare the outcome of constrained and unconstrained primary total knee arthroplasty (TKA) in the management of the valgus deformity. METHODS: This is a retrospective review of patients with type II valgus knee who underwent primary TKA from 1999 to 2011. There were fifty patients in Group 1 who underwent varus-valgus constrained TKA. They were matched with another fifty patients in Group 2 who underwent unconstrained TKA. RESULTS: The mean joint line shift was significantly higher in Group 1 (+8 mm, SD 6 mm) than in Group 2 (+2 mm, SD 3 mm) (p = 0.03). At 2 years, there was no difference in anterior-posterior stability and mediolateral stability according to the Knee Society Score, and patients in Group 2 reported significantly better mean function score of 66.2 (SD 9.3) (mean 48, SD 7.1 in Group 1) (p = 0.002). Two patients (6 %) in Group 1 underwent revision surgery--one for a broken central peg and the other for aseptic loosening. Three patients (2 %) in Group 2 underwent revision surgery--two for global instability and one for poly wear. The estimated survivorship time was 8.3 years for constrained TKA and 12.0 for unconstrained TKA. CONCLUSION: Constrained TKA was associated with more significant joint line changes for the management of valgus arthritic knee, when compared with unconstrained TKA. LEVEL OF EVIDENCE: Retrospective study, Level III.
Authors: Adolph V Lombardi; Kathleen L Dodds; Keith R Berend; Thomas H Mallory; Joanne B Adams Journal: J Bone Joint Surg Am Date: 2004 Impact factor: 5.284
Authors: F Iacono; G F Raspugli; D Bruni; G Filardo; S Zaffagnini; W F Luetzow; M Lo Presti; I Akkawi; G M Marcheggiani Muccioli; M Marcacci Journal: Knee Surg Sports Traumatol Arthrosc Date: 2013-12-22 Impact factor: 4.342
Authors: Chia Liang Ang; Stephanie Fook; Shi Lu Chia; Pak Lin Chin; Ngai Nung Lo; Seng Jin Yeo Journal: Knee Surg Sports Traumatol Arthrosc Date: 2013-09-22 Impact factor: 4.342
Authors: Dinu Vermesan; Ilie Trocan; Radu Prejbeanu; Dan V Poenaru; Horia Haragus; Damian Gratian; Massimo Marrelli; Francesco Inchingolo; Monica Caprio; Raffaele Cagiano; Marco Tatullo Journal: J Clin Med Res Date: 2014-12-29