Influence of mini approach instrumentation on component alignment in unicondylar knee replacement.

Dr Vinod Kumar, Dr Deepak Gupta, Dr Ananya Sharma
Department of Orthopaedics, MAMC and Lok Nayak Hospital, New Delhi 110002.

AIM- to evaluate the accuracy of placements of implants using mini approach instrumentation.
Methods- It was an Interventional Prospective Clinical Study in thirty-three knees of primary Symptomatic Medial compartment osteoarthritis having full thickness articular cartilage loss with or without bone loss in the medial compartment. On AP views, the alignments of the femoral and tibial components were measured. On lateral views, flexion/extension of the femoral and tibial component was. A 7° posterior–inferior tilt of the tibial component was taken as neutral. Tilting beyond this gave a positive value, whereas tilting less than this was negative.

Summary- Position of varus/ valgus femoral component (recommended range of alignment as 10° varus to 10° valgus) was within acceptable ranges in all the patients with a mean of 4.21° varus (SD:2.98°, range:3.3° valgus to 8.6° varus).
Position of flexion/ extension femoral component (recommended range of alignment as 5° extension to 10° flexion) was within acceptable ranges in 72.73% of knees with a mean of 7.21° flexion (SD:4.3°, range:1.2° flexion to 14.4° flexion). Posterior fit of femoral component with proposed acceptable range of 0 to 4 mm posterior overhang was achieved in all patients except three with mean: 0.73 mm overhang (range 1 mm short to 2.5 mm overhang). Medial/ lateral fit of femoral component was achieved in 54.55% of knees with the mean femoral component placement was 0.82 mm lateral (range: 1 mm medial to 5 mm lateral). Position of varus/valgus tibial component (recommended range of alignment as 5° varus to 5° valgus) was achieved in 54.55% patients with mean alignment of 5.8° varus (SD:3.89°, range:3° valgus to 13.2° varus).
Superior/ Inferior tilt of tibial component (recommended range of alignment from 5° superior tilt to 5° inferior tilt) was achieved in 72.73% of the knees with mean tibial alignment was 3.6° superior tilt. Anterior fit of tibial component of all except three patient, were within the acceptable range (flush or <5mm short). Posterior fit of tibial component was 0.2 mm short (range: 3 mm short to 2 mm overhang). This was achieved in 72.73% of patients. Medial fit of tibial component was 0.4 mm short (range: 2 mm short to flush). Nine patients were outside the acceptable range of medial fit of tibial component. Lateral fit of tibial component of all patients were within the acceptable range. Meniscal bearings were placed centrally in all the patients.

Conclusion- Components of UKR i.e. Femoral component, Tibial component and Meniscal bearing can be placed with high accuracy using mini-approach instrumentation. In this study, two implant position namely Femoral central position and Tibia varus alignment had maximum error rate. This can be attributed to technical errors and learning surgical curve.

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Antero-Posterior Translation of Mobile-Bearing in Mobile-Bearing Unicompartmental Knee Arthroplasty ePoster Presentation Takahiro Arakawa, MD, JAPAN Kenichi Kono, MD, PhD, JAPAN Tetsuya TOMITA, MD, PhD, JAPAN Shuji Taketomi, MD, PhD, JAPAN Ryota Yamagami, MD, JAPAN Kohei Kawaguchi, MD, PhD, JAPAN Tomofumi Kage, JAPAN Ryo Murakami, MD, JAPAN Hiroshi Inui, PhD, JAPAN Sakae Tanaka, MD, PhD, JAPAN
Combined Single-Shot Infiltration Between the Popliteal Artery and Capsule of the Knee and Adductor Canal Block with Bupivacaine, Dexmedetomidine, and Dexamethasone for Total Knee Arthroplasty: A Propensity-Matched Analysis ePoster Presentation David Freccero, MD, UNITED STATES Aneesh V Samineni, BA, UNITED STATES Seroos Salavati, MD, UNITED STATES
Total Knee Arthroplasty Outcomes Following Anterior Cruciate Ligament Reconstruction ePoster Presentation Brian Rao, BS, UNITED STATES Alex C. Dibartola, MD, MPH, UNITED STATES Eric Milliron, BS, UNITED STATES Parker Cavendish, BS, UNITED STATES James C. Kirven, BS, UNITED STATES Spencer E. Talentino, MD, UNITED STATES Charles Qin, MD, UNITED STATES Ryan H. Barnes, MD, UNITED STATES Robert A. Duerr, MD, UNITED STATES Christopher C. Kaeding, MD, UNITED STATES Robert A Magnussen, MD, MPH, UNITED STATES David C. Flanigan, MD, UNITED STATES
Intra- And Inter-Operator Reliability Assessment Of A Novel Extramedullary Accelerometer-Based Smart Cutting-Guide For Total Knee Arthroplasty: An In-Vivo Study ePoster Presentation Stefano Zaffagnini, MD, Prof., ITALY Domenico Alesi, MD, ITALY Arcangelo Russo, MD, ITALY Mirco Lo Presti, MD, ITALY Iacopo Sassoli, MD, ITALY Matteo La Verde, MD, ITALY Giulio Maria Marcheggiani Muccioli, MD, PhD, Associate Professor, ITALY
Efficacy of Functional Alignment Technique In Robotic-Arm Assisted Total Knee Arthroplasty ePoster Presentation Masashi Tamaki, MD, PhD, JAPAN Yuki Yamauchi, MD,PhD, JAPAN Seishiro Higa, MD, JAPAN Tomoyuki Shimakawa, MD, JAPAN Yuki Isobe, MD, JAPAN Teruya Ishibashi, MD,PhD, JAPAN Shoji Konda, PhD, JAPAN Tetsuya Tomita, M.D.,Ph.D , JAPAN
Effect of Restricted Kinematic Alignment Total Knee Arthroplasty on Coronal Plane Alignment Of The Ankle Joint ePoster Presentation Bartosz Michał Maciąg, MD, POLAND Marcin Łapiński, MD, POLAND Tomasz Mrozek, MD, POLAND Adrian Góralczyk, MD, POLAND Maciej Swiercz, MD, POLAND Grzegorz Maciąg, POLAND Krystian Żarnovsky, POLAND Olga Adamska, POLAND Artur Stolarczyk, MD, PhD, POLAND
Anatomical distribution of radiological OA Influences the Outcome of TKA ePoster Presentation Johanna Elliott, MB, BS, B.Med Sci, Master Science, GERMANY
Subtalar Joint Compensation using Full-length Standing Lower Extremity Anteroposterior Radiograph after Total Knee Arthroplasty for Varus Osteoarthritis in Nara Medical University Hospital with 2-year Follow-up ePoster Presentation Jerre Co De Guzman, MD, PHILIPPINES Munehiro Ogawa, MD, PhD, JAPAN Yusuke Ozaki, MD, JAPAN Yasuhito Tanaka, Prof., JAPAN Yuki Nishimura, MD, JAPAN Maria Elizabeth Mercado, MD, MAS, PHILIPPINES
Factors Associated With Failure and Survivorship Following Unicompartmental Knee Arthroplasty: A Single-Center Experience ePoster Presentation Anirudh K Gowd, MD, UNITED STATES Johannes F. Plate, MD, PhD, UNITED STATES Asher Lichtig, MD, UNITED STATES Orhan Yanmis, MD, UNITED STATES Gary G. Poehling, MD, UNITED STATES
Use of Tibial Stem for Patients with Morbid Obesity in Total Knee Arthroplasty ePoster Presentation José Eduardo Flores Naranjo, MD, MEXICO Adrian Aziz Cortes De La Fuente, MD, MEXICO Octavio Martinez Montiel, MD, MEXICO Fernando Martinez Zuñiga, MD, MEXICO
Does Robotic Assisted Unicompartmental Knee Arthroplasty Restore Native Jointline More Accurately Than With Conventional Instruments? ePoster Presentation Ashok Kumar Podhili Subramani, MS, INDIA Shantanu S. Patil, MBBS, MS(Orth), INDIA SAWAN PAWAR, MBBS MS (ORTH), INDIA Kalaivanan Kanniyan, MBBS MS Orth, INDIA karthik jayachandran, MS, INDIA PICHAI SURYANARAYAN, MBBS MS ORTH, INDIA

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Influence of Mini Approach Instrumentation on Component Alignment In Unicondylar Knee Replacement

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Influence of Mini Approach Instrumentation on Component Alignment In Unicondylar Knee Replacement

Influence of Mini Approach Instrumentation on Component Alignment In Unicondylar Knee Replacement

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