Patellar height before and after unicompartmental knee arthroplasty: association with early clinical outcome?

Naal, FD; Neuerburg, C; von Knoch, F; Salzmann, GM; Kriner, M; Munzinger, U

doi:10.1007/s00402-008-0654-2

2009

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Title:: Patellar height before and after unicompartmental knee arthroplasty: association with early clinical outcome?
Document type:: Journal Article
Author(s):: Naal, FD; Neuerburg, C; von Knoch, F; Salzmann, GM; Kriner, M; Munzinger, U
Abstract:: INTRODUCTION: There is paucity of information available concerning the role of patellar height in unicompartmental knee arthroplasty (UKA). The present study was conducted to determine the patellar height before and after UKA and to assess possible effects on the early clinical outcome. MATERIALS AND METHODS: We measured the patellar height before and after UKA in 83 consecutive knees using the Blackburne-Peel (BP) index and Insall-Salvati (IS) ratio and investigated the impact of the patellar height on the clinical outcome 2 years after surgery. RESULTS: BP values significantly decreased from 0.81 before surgery to 0.76 postoperatively (P < 0.001). IS ratios did not significantly decrease from 1.02 to 1.01 (P = 0.108). Lower preoperative BP values were negatively correlated with the postoperative knee extension (r = -0.357, P = 0.026), while higher preoperative BP values were negatively associated with the postoperative Knee Society Score (r = -0.302, P = 0.046). Lower preoperative IS values were negatively correlated with postoperative Knee Scores (r = -0.394, P = 0.019). CONCLUSION: After UKA, the patellar height decreased significantly according to the BP index, but not significantly according to the IS ratio. We found only weak and inconsistent correlations between the patellar height and clinical outcome parameters. Hence, based on the present results, the patellar height seems not to be a strict separate patient-selection criterion for UKA.
Journal title abbreviation:: Arch Orthop Trauma Surg
Year:: 2009
Journal volume:: 129
Journal issue:: 4
Pages contribution:: 541-7
Language:: eng
Fulltext / DOI:: doi:10.1007/s00402-008-0654-2
Pubmed ID:: http://view.ncbi.nlm.nih.gov/pubmed/18512065
Print-ISSN:: 0936-8051
TUM Institution:: Fachgebiet Sportorthopädie (Prof. Imhoff); Institut für Medizinische Statistik und Epidemiologie
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