caa a22 4500 605457549 CHVBK 20210128100224.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00167-014-3187-y doi (NATIONALLICENCE)springer-10.1007/s00167-014-3187-y Does proximal tibial osteotomy with a novel osteotomy system obtain coronal plane correction without affecting tibial slope and patellar height? [Elektronische Daten] [Andrew Blackman, Aaron Krych, William Engasser, Bruce Levy, Michael Stuart] Purpose: To determine changes in tibial slope, patellar height, and coronal plane alignment after medial opening wedge proximal tibial osteotomy (PTO) using a modern osteotomy system. Methods: Patients undergoing medial opening wedge PTO for any indication with follow-up until radiographic union were identified. Pre- and post-operative tibial slope (referenced off the anterior tibial cortex, proximal tibial anatomic axis, and posterior tibial cortex), patellar height (Caton-Deschamps, Blackburne-Peel, and Insall-Salvati indices), and coronal plane [mechanical axis and weight-bearing line (WBL) ratio] measurements were taken by two observers and compared. Results: Review of 27 patients demonstrated unchanged tibial slope and slightly decreased patellar height post-operatively (Caton-Deschamps: −0.10±0.09; Blackburne-Peel: −0.11±0.10). Coronal plane measurements showed 6.4°±1.8° mean change in mechanical axis. Mean post-operative WBL ratio was significantly lower (51.6±11.5%) than mean goal WBL ratio (62.2±2.5%). Preoperative mechanical axis >6° varus and osteoarthritis alone as the surgical indication were risk factors for undercorrection >10%. Conclusions: Medial opening wedge PTO using a recently developed instrumentation system was found to have no effect on tibial slope. Patellar height was decreased after osteotomy using this system, although clinical significance of these findings is unknown. Coronal plane undercorrection of 10.6% of the target WBL ratio was seen in the group as a whole, although secondary analysis of these results indicated that patients with medial compartment osteoarthritis and/or preoperative mechanical axis of >6° varus accounted for the majority of the cases of undercorrection. Level of evidence: Retrospective case series, Level IV. Springer-Verlag Berlin Heidelberg, 2014 Proximal tibial osteotomy nationallicence Tibial slope nationallicence Patellar height nationallicence Genu varum nationallicence Blackman Andrew Department of Orthopedic Surgery, Mayo Clinic, 200 1st St, SW, 55905, Rochester, MN, USA aut Krych Aaron Department of Orthopedic Surgery, Mayo Clinic, 200 1st St, SW, 55905, Rochester, MN, USA aut Engasser William Department of Orthopedic Surgery, Mayo Clinic, 200 1st St, SW, 55905, Rochester, MN, USA aut Levy Bruce Department of Orthopedic Surgery, Mayo Clinic, 200 1st St, SW, 55905, Rochester, MN, USA aut Stuart Michael Department of Orthopedic Surgery, Mayo Clinic, 200 1st St, SW, 55905, Rochester, MN, USA aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/12(2015-12-01), 3487-3493 0942-2056 23:12<3487 2015 23 167 https://doi.org/10.1007/s00167-014-3187-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-014-3187-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Blackman Andrew Department of Orthopedic Surgery, Mayo Clinic, 200 1st St, SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- Krych Aaron Department of Orthopedic Surgery, Mayo Clinic, 200 1st St, SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- Engasser William Department of Orthopedic Surgery, Mayo Clinic, 200 1st St, SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- Levy Bruce Department of Orthopedic Surgery, Mayo Clinic, 200 1st St, SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- Stuart Michael Department of Orthopedic Surgery, Mayo Clinic, 200 1st St, SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/12(2015-12-01), 3487-3493 0942-2056 23:12<3487 2015 23 167