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Cozzarelli NF, Khan IA, Arshi A, Sherman MB, Lonner JH, Fillingham YA. Return to Sport After Unicompartmental Knee Arthroplasty and Patello-Femoral Arthroplasty. J Arthroplasty 2024; 39:1988-1995.e5. [PMID: 38367903 DOI: 10.1016/j.arth.2024.02.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 01/24/2024] [Accepted: 02/05/2024] [Indexed: 02/19/2024] Open
Abstract
BACKGROUND Data on sports/physical activity participation following unicompartmental knee arthroplasty (UKA) and patello-femoral arthroplasty (PFA) is variable and limited. The purpose of this study was to assess participations, outcomes, and limitations in sports following UKA and PFA. METHODS Patients who underwent UKA and PFA at a single institution from 2015 to 2020 were surveyed on sports participation before and after surgery. Data was correlated with perioperative patient characteristics and outcome scores. Among 776 patients surveyed, 356 (50%) patients responded. Of respondents, 296 (83.1%) underwent UKA, 44 (12.6%) underwent PFA, and 16 (4.5%) underwent both UKA/PFA. RESULTS Activity participation rates were 86.5, 77.3, and 87.5% five years prior, and 70.9, 61.4, and 75% at one year prior to UKA, PFA, and UKA/PFA, respectively. Return to sports rates were 81.6, 64.7, and 62.3% at mean 4.6 years postoperatively, respectively. The most common activities were recreational walking, swimming, cycling, and golf. Patients returned to a similar participation level for low-impact activities, whereas participation decreased for intermediate- and high-impact activities. Patients participating in activities had higher postoperative Knee Injury and Osteoarthritis Outcome Score Joint Replacement (P < .001), 12-Item Short Form Physical Component Score (P = .045) and Mental Component Score (P = .012). Activity restrictions were reported among 25, 36.4, and 25% of UKA, PFA, and UKA/PFA patients, respectively, and were more commonly self-imposed than surgeon-directed. CONCLUSIONS Though UKA patients' postoperative sports participation may improve compared to one year preoperatively, participation for patients surgically treated for isolated osteoarthritis is decreased compared to 5 years preoperatively and varies among patient subsets.
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Affiliation(s)
- Nicholas F Cozzarelli
- Department of Orthopedic Surgery, Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Irfan A Khan
- Department of Orthopedic Surgery, Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Armin Arshi
- Department of Orthopedic Surgery, Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania; Department of Orthopedic Surgery, NYU Langone Health, New York, New York
| | - Matthew B Sherman
- Department of Orthopedic Surgery, Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Jess H Lonner
- Department of Orthopedic Surgery, Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Yale A Fillingham
- Department of Orthopedic Surgery, Rothman Orthopaedic Institute at Thomas Jefferson University, Philadelphia, Pennsylvania
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Hariri M, Hauer G, Smolle M, Sadoghi P, Leithner A, Panzram B, Merle C, Renkawitz T, Walker T. Mobile bearing versus fixed bearing medial unicompartmental knee replacement: an independent two center matched-pairs analysis. Arch Orthop Trauma Surg 2022; 143:3383-3389. [PMID: 36171340 DOI: 10.1007/s00402-022-04629-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 09/18/2022] [Indexed: 12/01/2022]
Abstract
INTRODUCTION The aim of the present study was to compare clinical outcome between patients following fixed-bearing (FB) or mobile-bearing (MB) unicompartmental knee replacement (UKR) for antero-medial knee osteoarthrosis (OA) at two independent orthopedic centers. MATERIALS AND METHODS Matched-pairs were built between 35 patients receiving FB-UKR and 52 patients following MB-UKR regarding age at time of surgery, body mass index (BMI) and range of motion (ROM) preoperatively. Clinical and functional outcome was measured postoperatively by the American Knee Society Score (AKSS-O/AKSS-F), ROM, Tegner Activity Scale (TAS) as well as the Short Form 36 Health Survey (SF-36). RESULTS The average treatment effect of the treated (ATT) after propensity score matching showed a significantly superior ROM in patients following MB-UKR (FB: 118°, MB: 124°). All remaining parameters had no statistically significant differences between both groups involving TAS, AKSS and SF-36. CONCLUSIONS The present study suggests that MB-UKR can provide a greater ROM compared to FB-UKR on comparable patients. The authors believe that both designs are suitable for adequate improvement of clinical outcome and ROM for patients suffering from antero-medial osteoarthrosis of the knee joint. LEVEL OF EVIDENCE Retrospective cohort study, Level IV.
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Affiliation(s)
- Mustafa Hariri
- Clinic for Orthopaedics, University of Heidelberg, Schlierbacher Landstrasse 200a, 69118, Heidelberg, Germany
| | - Georg Hauer
- Department of Orthopaedics and Trauma, Medical University of Graz, Graz, Austria
| | - Maria Smolle
- Department of Orthopaedics and Trauma, Medical University of Graz, Graz, Austria
| | - Patrick Sadoghi
- Department of Orthopaedics and Trauma, Medical University of Graz, Graz, Austria
| | - Andreas Leithner
- Department of Orthopaedics and Trauma, Medical University of Graz, Graz, Austria
| | - Benjamin Panzram
- Clinic for Orthopaedics, University of Heidelberg, Schlierbacher Landstrasse 200a, 69118, Heidelberg, Germany
| | - Christian Merle
- Clinic for Orthopaedics, University of Heidelberg, Schlierbacher Landstrasse 200a, 69118, Heidelberg, Germany
| | - Tobias Renkawitz
- Clinic for Orthopaedics, University of Heidelberg, Schlierbacher Landstrasse 200a, 69118, Heidelberg, Germany
| | - Tilman Walker
- Clinic for Orthopaedics, University of Heidelberg, Schlierbacher Landstrasse 200a, 69118, Heidelberg, Germany.
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D'Ambrosi R, Anghilieri FM, Corona K, Mariani I, Valli F, Ursino N, Hirschmann MT. Similar rates of return to sports and BMI reduction regardless of age, gender and preoperative BMI as seen in matched cohort of hypoallergenic and standard Cobalt Chromium medial unicompartmental knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 2022; 30:890-898. [PMID: 33550449 DOI: 10.1007/s00167-021-06467-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 01/20/2021] [Indexed: 11/30/2022]
Abstract
PURPOSE To compare the rate of return to sports and body mass index (BMI) reduction in patients who underwent surgery for unicompartmental knee arthroplasty (UKA) with either Cobalt-Chromium (CoCr) alloy UKA or with hypoallergenic UKA, stratified by age, gender and BMI. METHODS Two consecutive cohorts of patients with a total of 172 UKA and a minimum 2-year follow-up period were prospectively included in this comparative study. The first cohort consisted of 136 consecutive series of standard Cobalt-Chromium (CoCr Group). The second cohort consisted of 36 consecutive mobile-bearing hypoallergenic Titanium Niobium Nitride UKA, (TiNbN Group). The clinical evaluation was based on the University of California, Los Angeles (UCLA) activity scores and the High-Activity Arthroplasty Score (HAAS) evaluated on the day before surgery (T0) and after a minimum follow-up of 12 months (T1) and 24 months (T2). Radiographic evaluation performed at T2 included the femoral component position in varus/valgus, the tibial component in varus/valgus and the anteroposterior slope. RESULTS No statistical differences were found between the groups at each follow-up, as shown by the UCLA and HAAS score (n.s.). Both groups showed a statistically significant improvement (p < 0.05) at each follow-up.. Both groups showed a statistically significant BMI reduction between T0 and T2 (p < 0.05). Radiographic analysis revealed no statistical differences between the two groups in terms of the three measures after the final follow-up (n.s.). All the subgroups showed a significant (p < 0.05) rate of return to sport if compared with the preoperative value (T2 versus T0), except for male in TiNbN group. CONCLUSIONS Both TiNbN and CoCr medial mobile-bearing UKA enabled patients to return to sports after the final follow-up, regardless of age, BMI, gender and metal sensitivity. These findings inform shared decision making and can help to manage patient expectations after surgery, in particular, in active patients with an overt metal allergy, a specific hypoallergenic implant should be considered the gold standard implant in partial knee replacement surgery. LEVEL OF EVIDENCE Cohort Study, Level III. REGISTRATION researchregistry6250- www.researchregistry.com .
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Affiliation(s)
| | - Filippo Maria Anghilieri
- Dipartimento di Scienze Biomediche per la Salute, Università degli Studi di Milano, Milan, Italy
| | - Katia Corona
- Dipartimento di Medicina e Scienze della Salute Vincenzo Tiberio, Università degli Studi del Molise, Campobasso, Italy
| | - Ilaria Mariani
- Institute for Maternal and Child Health, IRCCS "Burlo Garofolo", Trieste, Italy
| | | | | | - Michael Tobias Hirschmann
- Department of Orthopaedic Surgery and Traumatology Kantonsspital, Baselland (Bruderholz, Liestal, Laufen), Liestal, Switzerland
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Monti L, Franchi E, Ursino N, Mariani I, Corona K, Anghilieri FM, D’Ambrosi R. Hypoallergenic unicompartmental knee arthroplasty and return to sport: comparison between Oxidized Zirconium and Titanium Niobium Nitride. ACTA BIO-MEDICA : ATENEI PARMENSIS 2022; 93:e2022160. [PMID: 35775764 PMCID: PMC9335424 DOI: 10.23750/abm.v93i3.12677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Accepted: 02/08/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND The present study aims to compare the rate of return to sports in patients who underwent surgery for mobile-bearing UKA with either hypoallergenic TiNbN or with oxidized zirconium alloy implants. METHODS The records of two consecutive cohorts for a total of 90 hypoallergenic implants were prospectively analysed. The first cohort consisted of 41 consecutive series of medial mobile-bearing hypoallergenic TiNbN UKA, whereas the second cohort consisted of 49 consecutive medial fixed-bearing hypoallergenic Uni Oxinium.The clinical evaluation involved evaluating each patient's University of California, Los Angeles (UCLA) activity scoresand the High-Activity Arthroplasty Score(HAAS). Each patient was clinically evaluated on the day before surgery (T0), then after a minimum follow-up period of 12 months (T1), and finally after 24 months (T2). Results:The only pre-operative difference between the two groups involved pre-operative BMI with significantly higher BMI in TiNbN Group (p<0.001). Both groups reported significant improvement at each follow-up compared with the previous and also at the final follow up with respect to UCLA and HAAS (p<0.05), except for UCLA in TiNbN between T1 and T2(p>0.05). Moreover, BMI improved significantly at the final follow up, but only in TiNbN group (p<0.05). CONCLUSIONS Both TiNbN and Oxinium UKA procedures enabled patients to return to an acceptable level of sports activity with excellent radiographic outcomes after the final follow up regardless of the age, gender, BMI, and bearing type.
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Affiliation(s)
| | | | - Nicola Ursino
- IRCCS Istituto Ortopedico Galeazzi, Via Galeazzi 4, 20161, Milan, Italy
| | - Ilaria Mariani
- Institute for Maternal and Child Health – IRCCS “Burlo Garofolo” – Trieste, Italy
| | - Katia Corona
- Università degli Studi del Molise, Dipartimento di Medicina e Scienze della Salute Vincenzo, Tiberio, Campobasso, Italy
| | - Filippo Maria Anghilieri
- Dipartimento di Scienze Biomediche per la Salute, Università degli Studi di Milano, Milan, Italy
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Morris BL, Ayres JM, Reinhardt D, Tarakemeh A, Mullen S, Schroeppel JP, Vopat BG. Unicompartmental knee arthroplasty: A PearlDiver study evaluating complications rates, opioid use and utilization in the Medicare population. J Exp Orthop 2021; 8:103. [PMID: 34750676 PMCID: PMC8575771 DOI: 10.1186/s40634-021-00390-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 08/17/2021] [Indexed: 11/15/2022] Open
Abstract
PURPOSE Despite increased utilization of unicompartmental knee arthroplasty (UKA) for unicompartmental knee osteoarthritis, outcomes in Medicare patients are not well-reported. The purpose of this study is to analyze practice patterns and outcome differences between UKA and TKA in the Medicare population. It is hypothesized that UKA utilization will have increased over the course of the study period and that UKA will be associated with reduced opioid use and lower complication rates compared to TKA. METHODS Using PearlDiver, the Humana Claims dataset and the Medicare Standard Analytic File (SAF) were analyzed. Patients who underwent UKA and TKA were identified by CPT codes. Postoperative complications were identified by ICD-9/ICD-10 codes. Opioid use was analyzed by the number of days patients were prescribed opioids postoperatively. Survivorship was defined as conversion to TKA. RESULTS In the Humana dataset, 7,808 UKA and 150,680 TKA patients were identified. 8-year survivorship was 87.7% (95% CI [0.861,0.894]). Postoperative opioid use was significantly higher after TKA (186.1 days) compared to UKA (144.7 days) (p < 0.01, Δ = 41.1, 95% CI = [30.41, 52.39]). In the SAF dataset, 20,592 UKA patients and 110,562 TKA patients were identified. Survivorship was highest in patients > 80 years old and lowest in patients < 70 years old. In both datasets, postoperative complication rates were higher in TKA patients compared to UKA patients in nearly all categories. CONCLUSIONS UKA represents an increasingly utilized treatment for osteoarthritis in the Medicare population and may be comparatively advantageous to TKA due to reduced opioid use and complication rates after surgery. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Brandon L Morris
- Department of Orthopedic Surgery, University of Kansas Medical Center, 3901 Rainbow Bvld, Kansas City, KS, 66160, USA
| | - Jack M Ayres
- Department of Orthopedic Surgery, University of Kansas Medical Center, 3901 Rainbow Bvld, Kansas City, KS, 66160, USA.
| | - Daniel Reinhardt
- Department of Orthopedic Surgery, University of Kansas Medical Center, 3901 Rainbow Bvld, Kansas City, KS, 66160, USA
| | - Armin Tarakemeh
- Department of Orthopedic Surgery, University of Kansas Medical Center, 3901 Rainbow Bvld, Kansas City, KS, 66160, USA
| | - Scott Mullen
- Department of Orthopedic Surgery, University of Kansas Medical Center, 3901 Rainbow Bvld, Kansas City, KS, 66160, USA
| | - J Paul Schroeppel
- Department of Orthopedic Surgery, University of Kansas Medical Center, 3901 Rainbow Bvld, Kansas City, KS, 66160, USA
| | - Bryan G Vopat
- Department of Orthopedic Surgery, University of Kansas Medical Center, 3901 Rainbow Bvld, Kansas City, KS, 66160, USA
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Otoshi A, Kumagai K, Yamada S, Nejima S, Fujisawa T, Miyatake K, Inaba Y. Return to sports activity after opening wedge high tibial osteotomy in patients aged 70 years and older. J Orthop Surg Res 2021; 16:576. [PMID: 34583736 PMCID: PMC8477492 DOI: 10.1186/s13018-021-02718-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 09/13/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The purpose of this study was to evaluate return to sports (RTS) after opening wedge high tibial osteotomy (OWHTO) in elderly patients and associated factors affecting RTS. METHODS Seventy-four patients (mean age 68 years) who underwent OWHTO were enrolled. Clinical outcomes were evaluated using the Knee Society Score (KSS). Patients were asked regarding types of sports activities and their levels of participation within preoperative 1 year and postoperative 1 year. Levels of participation in sports and recreational activities were examined using the Tegner activity scale. The outcomes were compared between two age groups (≥ 70 years vs. < 70 years). RESULTS Of the 74 patients overall, 59 participated in at least one sport preoperatively, and 55 returned to sports postoperatively (RTS 93%). The KSS knee score and function score were significantly improved after surgery in both age groups (P < 0.05), but no significant differences were found between the age groups. The Tegner activity scales for ≥ 70 years and < 70 years were 2.9 ± 1.1 and 4.0 ± 1.9 preoperatively (P < 0.01) and 2.7 ± 1.2 and 3.3 ± 1.4 postoperatively (P = 0.16), respectively. RTS was reported by 24 of 25 (96.0%) in the age < 70 years group and 31 of 34 (91.2%) in the age ≥ 70 years group. Majority of age ≥ 70 years participated in low-impact sports preoperatively and returned to the same impact level postoperatively. CONCLUSIONS The rate of RTS after OWHTO was high in patients aged 70 years and older with low-impact level. OWHTO is a preferred surgical option for elderly patients who desire RTS.
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Affiliation(s)
- Akio Otoshi
- Department of Orthopaedic Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Ken Kumagai
- Department of Orthopaedic Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan.
| | - Shunsuke Yamada
- Department of Orthopaedic Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Shuntaro Nejima
- Department of Orthopaedic Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Takahiro Fujisawa
- Department of Orthopaedic Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Kazuma Miyatake
- Department of Orthopaedic Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Yutaka Inaba
- Department of Orthopaedic Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
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D'Ambrosi R, Nuara A, Mariani I, Corona K, Mogos S, Catellani F, Hantes M, Ursino N. Return to physical activity and change in body mass index after hypoallergenic medial mobile-bearing unicompartmental knee arthroplasty. J Orthop Traumatol 2021; 22:36. [PMID: 34536139 PMCID: PMC8449751 DOI: 10.1186/s10195-021-00598-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 09/01/2021] [Indexed: 12/13/2022] Open
Abstract
Background The primary purpose of the present prospective study was to consecutively analyse the outcomes of the return to sports activity of patients with positive patch tests undergoing a medial mobile-bearing titanium niobium nitride (TiNbN) unicompartmental knee arthroplasty (UKA). The secondary purpose was to ascertain if a higher grade of physical activity leads to a reduction in the body mass index (BMI) of the patients. Material and methods Forty-one patients with positive skin patch tests were included in this prospective study. The clinical evaluation consisted of the University of California, Los Angeles (UCLA) activity scale and the High-Activity Arthroplasty Score (HAAS). Each patient was evaluated the day before surgery (T0), after 12.37 ± 0.70 months (T1), and on the day of the final follow-up, after 67.03 ± 18.2 months (T2). Furthermore, the BMI of each patient was analysed before surgery and during the final follow-up. Results The UCLA and HAAS mean preoperative values ranged from 3.68 ± 1.1.7 and 6.15 ± 0.76 to 6.1 ± 0.76 and 10.34 ± 1.3, respectively, at T1 (p < 0.0001) and to the final values of 6.34 ± 0.62 and 11.0 ± 8.9, respectively, at T2 (UCLA: T2 versus T1: p = 0.132; T2 versus T0: p < 0.0001; HAAS: T2 versus T1: p = 0.0027; T2 versus T0: p < 0.001). BMI ranged from a preoperative value of 27.97 ± 3.63 to a final value of 26.84 ± 3.11 (p < 0.0001). The only differences within the subgroups concerned patients with BMI ≥ 28, showing a superior HAAS at each follow-up (p < 0.05). A positive correlation was found between BMI and HAAS at T0 and T2 (p < 0.05). Conclusions This is the first study to evaluate the rate of the return to sports activities and change in BMI following hypoallergenic UKA. The majority of patients reduced their weight following UKA and improved their physical activity, showing outcomes that were comparable to the standard cobalt–chrome (CoCr) prostheses, regardless of gender, age, BMI and implant size. Level of evidence IV – Prospective Cohort Study. Trial registration researchregistry5978—Research Registry www.researchregistry.com Supplementary Information The online version contains supplementary material available at 10.1186/s10195-021-00598-4.
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Affiliation(s)
| | - Alessandro Nuara
- IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.,Dipartimento Di Scienze Biomediche Per La Salute, Università Degli Studi Di Milano, Milan, Italy
| | - Ilaria Mariani
- Institute for Maternal and Child Health-IRCCS "Burlo Garofolo", Trieste, Italy
| | - Katia Corona
- Dipartimento Di Medicina E Scienze Della Salute Vincenzo Tiberio, Università Degli Studi del Molise, Campobasso, Italy
| | - Stefan Mogos
- Foișor Orthopaedics Hospital, Bucharest, Romania
| | | | - Michael Hantes
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Thessalia, University Hospital of Larissa, Larissa, Greece
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Abstract
Osteoarthritis of the medial compartment, where the lateral compartment and patella-femoral joint are relatively spared, is a common orthopaedic presentation. Most frequently, the treatment of choice would be a total knee replacement, which involves removing healthy joint surfaces in such patients. Arthroscopic debridement in the osteoarthritic knee has fallen out of favour due to poor clinical results. A trend has developed towards less invasive surgery with uni-compartmental knee replacement (UKR) and high tibial osteotomy (HTO) gaining increasing popularity. Surgeons differ in their relative indications and contraindications to performing these procedures. Total knee replacement (TKR) continues to have the lowest overall revision rate of the available options. Growing evidence demonstrates more favourable patient-reported outcome measures in UKR and HTO patients, compared to TKR. Knee joint distraction (KJD) has been demonstrated as an alternative method of treatment in such patients.
Cite this article: EFORT Open Rev 2021;6:113-117. DOI: 10.1302/2058-5241.6.200102
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Affiliation(s)
- Daniel J McCormack
- Department of Orthopaedics, University Hospitals of Leicester NHS Trust, Leicester, UK
| | - Darren Puttock
- Department of Orthopaedics, University Hospitals of Leicester NHS Trust, Leicester, UK
| | - Steven P Godsiff
- Department of Orthopaedics, University Hospitals of Leicester NHS Trust, Leicester, UK
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