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Kim J, Bitar R, Gagne O, Palma J, Shaffrey I, Cororaton A, Henry J, Deland J, Ellis S, Demetracopoulos C. Discrepancies Between Intraoperative and Postoperative Ankle Motion Measured for Anterior-Approach Total Ankle Arthroplasty. Foot Ankle Int 2024; 45:426-434. [PMID: 38482821 DOI: 10.1177/10711007241230554] [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] [Indexed: 05/12/2024]
Abstract
BACKGROUND Although intraoperative ankle motion serves as a foundational reference for anticipated motion after surgery and guides the addition of procedures to enhance ankle motion in total ankle arthroplasty (TAA), the relationship between intraoperative and postoperative ankle motion remains unclear. This study aimed to investigate the discrepancy between intraoperative and postoperative ankle range of motion (ROM) following TAAs using the anterior-approach, fixed-bearing systems. METHODS This study retrospectively reviewed 67 patients (67 ankles) who underwent primary TAA at a single institution. Three different types of anterior-approach, fixed-bearing TAA systems were included. Intraoperative fluoroscopy was used to document the maximal dorsiflexion and plantar flexion at the end of the case. Standardized weightbearing maximum dorsiflexion and plantar flexion sagittal radiographs were obtained pre- and postoperatively, following a previously described method. The motion between 3 different time points (preoperative, intraoperative, and postoperative [mean 11.4 months]) was compared using pairwise t tests, and their differences were quantified. RESULTS The mean total tibiotalar ROM was 38.1 degrees (SD 7.8) intraoperatively, and the postoperative total tibiotalar ROM was 24.2 degrees (SD 9.7) (P < .001), indicating that a mean of 65.3% (SD 26.7) of the intraoperative motion was maintained postoperatively. Intraoperative dorsiflexion (mean 11.6 [SD 4.5] degrees) showed no evidence of difference from postoperative dorsiflexion (mean 11.4 [SD 5.8] degrees, P > .99), indicating that a median of 95.6% (interquartile range: 66.2-112) of the intraoperative maximum dorsiflexion was maintained postoperatively. However, there was a significant difference between intraoperative plantarflexion (mean 26.4 [SD 6.3]) and postoperative plantarflexion (12.8 [SD 6.9] degrees, P < .001), indicating a mean 50.6% (SD 29.6) of intraoperative motion maintained in the postoperative assessment. There was an improvement of 2.5 degrees in the total tibiotalar ROM following TAA with statistical significance (P < .043). CONCLUSION This study revealed a significant difference between intraoperative ankle ROM and ankle ROM approximately 1 year after anterior-approach, fixed-bearing TAA, mainly due to plantarflexion motion restriction. Minimal difference in dorsiflexion suggests the importance of achieving the desired postoperative dorsiflexion motion during the surgery using the best possible adjunct procedures. LEVEL OF EVIDENCE Level IV, case series.
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Affiliation(s)
- Jaeyoung Kim
- Baylor University Medical Center, Dallas, TX, USA
- Hospital for Special Surgery, New York, NY, USA
| | | | | | | | | | | | | | | | - Scott Ellis
- Hospital for Special Surgery, New York, NY, USA
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Caravelli S, Bragonzoni L, Zinno R, Vocale E, Pinelli E, Barone G, Vara G, Di Paolo S, Zaffagnini S, Mosca M. In Vivo Total Ankle Arthroplasty Kinematic Evaluation: A Prospective Radiostereometric Analysis. Biomedicines 2024; 12:705. [PMID: 38672061 PMCID: PMC11048208 DOI: 10.3390/biomedicines12040705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 03/04/2024] [Accepted: 03/19/2024] [Indexed: 04/28/2024] Open
Abstract
Ankle osteoarthritis (OA) represents a significant social burden and is one of the main causes of chronic disability in a rapidly growing part of the world's population. Total ankle arthroplasty (TAA) has become increasingly popular despite the poor results obtained with the first dedicated designs. The purpose of this paper was to evaluate the ankle kinematics, in vivo and under weight-bearing conditions, of a TAA through a dynamic model-based radiostereometric analysis (MB-RSA). The clinical evaluation was performed by administering the American Orthopaedic Foot and Ankle Society ankle-hindfoot score and Short Form-36 questionnaires. The kinematic evaluation was conducted through MB-RSA during the execution of an open kinetic chain and a closed kinetic chain motor task. Double radiographic images of the ankle joint were processed using dedicated software to obtain a 3D reconstruction of the ankle prosthetic components' motion. Eighteen patients (five females) completed the clinical and instrumental preoperative and postoperative evaluations (age 59.1 ± 10.3). All clinical scores showed a marked improvement (p < 0.005). During the closed kinetic chain motor tasks, the ankle showed a total range of motion (ROM) in dorsi-plantarflexion of 19.84°. The parameters in varus-valgus were recorded. Physiological motion can be achieved in TAA, characterized by a wide range of motion and coupling of movements on the three planes. The results of the present work may help to understand the real movement of a widespread TAA model and possibly to improve future designs and instrumentation.
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Affiliation(s)
- Silvio Caravelli
- U.O. Ortopedia Bentivoglio, IRCCS Istituto Ortopedico Rizzoli, 40100 Bologna, BO, Italy; (E.V.); (M.M.)
| | - Laura Bragonzoni
- Dipartimento di Scienze della Qualità della Vita, University of Bologna, 40139 Bologna, BO, Italy; (L.B.); (R.Z.); (E.P.); (G.B.); (S.D.P.)
| | - Raffaele Zinno
- Dipartimento di Scienze della Qualità della Vita, University of Bologna, 40139 Bologna, BO, Italy; (L.B.); (R.Z.); (E.P.); (G.B.); (S.D.P.)
| | - Emanuele Vocale
- U.O. Ortopedia Bentivoglio, IRCCS Istituto Ortopedico Rizzoli, 40100 Bologna, BO, Italy; (E.V.); (M.M.)
| | - Erika Pinelli
- Dipartimento di Scienze della Qualità della Vita, University of Bologna, 40139 Bologna, BO, Italy; (L.B.); (R.Z.); (E.P.); (G.B.); (S.D.P.)
| | - Giuseppe Barone
- Dipartimento di Scienze della Qualità della Vita, University of Bologna, 40139 Bologna, BO, Italy; (L.B.); (R.Z.); (E.P.); (G.B.); (S.D.P.)
| | - Giulio Vara
- U.O. Radiodiagnostica, Ospedale Umberto I, 48022 Lugo, BO, Italy;
| | - Stefano Di Paolo
- Dipartimento di Scienze della Qualità della Vita, University of Bologna, 40139 Bologna, BO, Italy; (L.B.); (R.Z.); (E.P.); (G.B.); (S.D.P.)
| | - Stefano Zaffagnini
- II Clinic of Orthopaedics and Traumatology, IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, BO, Italy;
| | - Massimiliano Mosca
- U.O. Ortopedia Bentivoglio, IRCCS Istituto Ortopedico Rizzoli, 40100 Bologna, BO, Italy; (E.V.); (M.M.)
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Dahmen J, Stufkens SA, Kerkhoffs GM. Prospective Outcomes of a Biological Resurfacing Arthroplasty with Fascia Lata Autograft (BioJoint) for the Treatment of Osteoarthritis of the Midtarsal Joint Complex. Cartilage 2024; 15:37-46. [PMID: 37887431 PMCID: PMC10985392 DOI: 10.1177/19476035231206740] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 09/23/2023] [Accepted: 09/25/2023] [Indexed: 10/28/2023] Open
Abstract
OBJECTIVE To determine the clinical, safety, and radiological outcomes after biological resurfacing arthroplasty for the treatment of osteoarthritis (OA) of one or more joints of the midtarsal joint complex. DESIGN All prospectively followed patients with OA to one of or multiple joints of the midtarsal joint complex who were operated with a biological resurfacing arthroplasty with a fascia lata autograft (BioJoint procedure) were included. A total of 7 patients were included (5 males, 2 females), with a median age of 52 (interquartile range [IQR] 44-55) years. The primary outcome was the Numeric Rating Scale (NRS) for pain during walking 2 years postoperatively. Range of motion (ROM), revision rates, and complications were assessed. A postoperative MRI scan was performed to assess progression of OA, graft position and ingrowth, and the degree of bone marrow edema. RESULTS There was a 100% follow-up of the patients (median follow-up: 33 [IQR 26-33] months). The NRS during walking improved from 6 preoperatively to 2 at 2 years postoperatively (P < 0.05). There were no reoperations nor severe complications. The limitations in the ROM remained limited in the majority of the cases. MRI at 2 years of follow-up showed no progression of OA, reduced bone marrow edema, and no loosening of the grafts. CONCLUSION Biological resurfacing arthroplasty with a fascia lata autograft (BioJoint procedure) for OA to one or more joints in the midtarsal joint complex showed clinically relevant pain reduction during walking, improvement in clinical and radiological outcomes, and proved to be safe and durable.
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Affiliation(s)
- Jari Dahmen
- Department of Orthopedic Surgery and Sports Medicine, Amsterdam Movement Sciences, Amsterdam UMC, Location AMC, University of Amsterdam, Amsterdam, The Netherlands
- Academic Center for Evidence Based Sports Medicine (ACES), Amsterdam UMC, Amsterdam, The Netherlands
- Amsterdam Collaboration on Health & Safety in Sports (ACHSS), International Olympic Committee (IOC) Research Center, Amsterdam UMC, Amsterdam, The Netherlands
| | - Sjoerd A.S. Stufkens
- Department of Orthopedic Surgery and Sports Medicine, Amsterdam Movement Sciences, Amsterdam UMC, Location AMC, University of Amsterdam, Amsterdam, The Netherlands
- Academic Center for Evidence Based Sports Medicine (ACES), Amsterdam UMC, Amsterdam, The Netherlands
- Amsterdam Collaboration on Health & Safety in Sports (ACHSS), International Olympic Committee (IOC) Research Center, Amsterdam UMC, Amsterdam, The Netherlands
| | - Gino M.M.J. Kerkhoffs
- Department of Orthopedic Surgery and Sports Medicine, Amsterdam Movement Sciences, Amsterdam UMC, Location AMC, University of Amsterdam, Amsterdam, The Netherlands
- Academic Center for Evidence Based Sports Medicine (ACES), Amsterdam UMC, Amsterdam, The Netherlands
- Amsterdam Collaboration on Health & Safety in Sports (ACHSS), International Olympic Committee (IOC) Research Center, Amsterdam UMC, Amsterdam, The Netherlands
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Kyung MG, Lee DO, Easley ME, Cho J, Lee DY, Jeon JY. Preoperative incongruent subtalar joint predicts less favorable clinical outcome in total ankle arthroplasty. Foot Ankle Surg 2023:S1268-7731(23)00105-4. [PMID: 37301676 DOI: 10.1016/j.fas.2023.06.002] [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: 03/16/2023] [Revised: 05/28/2023] [Accepted: 06/03/2023] [Indexed: 06/12/2023]
Abstract
BACKGROUND This study aimed to determine the clinical effect of incongruent subtalar joint space on total ankle arthroplasty (TAA). METHODS Thirty-four consecutive patients who underwent TAA were grouped according to the status of subtalar joint incongruency. A comparison of clinical and radiographic parameters between groups as well as multiple regression analysis was performed to identify contributing factors to the final functional outcome. RESULTS The final American Orthopaedic Foot and Ankle Society (AOFAS) score was significantly higher in the congruent group compared to that of the incongruent group (p = 0.007). There were no significant differences between the two groups in measured radiographic angles. In multiple regression analysis, the female sex (p = 0.006) and incongruency of the subtalar joint (p = 0.013) were found to be significant contributing factors to the final AOFAS score. CONCLUSIONS A thorough preoperative investigation should be taken into the state of the subtalar joint for TAA.
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Affiliation(s)
- Min Gyu Kyung
- Department of Orthopedic Surgery, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 03080, Republic of Korea.
| | - Dong-Oh Lee
- Department of Orthopedic Surgery, SNU Seoul Hospital, 237 Gonghang-daero, Gangseo-gu, Seoul, Republic of Korea.
| | - Mark E Easley
- Department of Orthopedic Surgery, Duke University Medical Center, PO Box 2950, Durham, NC 27710, USA.
| | - Jaeho Cho
- Department of Orthopedic Surgery, Hallym University College of Medicine Chuncheon Sacred Heart Hospital, Republic of Korea.
| | - Dong Yeon Lee
- Department of Orthopedic Surgery, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul 03080, Republic of Korea; Department of Orthopedic Surgery, Seoul National University College of Medicine, Seoul, Republic of Korea.
| | - Ji Young Jeon
- Department of Radiology, Gil Medical Center, Gachon University College of Medicine, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon 21565, Republic of Korea.
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Davies H, Jennison T, Dalgleish J, Taher S, Chadwick C, Blundell C, Davies M. Response to "Letter Regarding: Subtalar Arthrodesis Union Rates With and Without Adjacent Ankle Arthrodesis". Foot Ankle Int 2023; 44:168. [PMID: 36756983 DOI: 10.1177/10711007221146979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Examination of the Impact of Strength and Velocity of the Knee and Ankle on Gait Speed in Community-Dwelling Older Adults. Healthcare (Basel) 2022; 10:healthcare10102093. [PMID: 36292540 PMCID: PMC9602105 DOI: 10.3390/healthcare10102093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 09/25/2022] [Accepted: 10/18/2022] [Indexed: 11/22/2022] Open
Abstract
The muscle strength of the knee extension and plantarflexion plays a crucial role in determining gait speed. Recent studies have shown that no-load angular velocity of the lower limb joints is essential for determining gait speed. However, no reports have compared the extent to which lower limb functions, such as knee extension strength, knee extension velocity, plantarflexion strength, and plantarflexion velocity, impact gait speed in a single study. Therefore, this study aimed to examine the relative importance of maximum strength and no-load angular velocity on gait speed. Overall, 164 community-dwelling older adults (72.9 ± 5.0 years) participated in this study. We measured the gait speed and lower limb function (the strength and velocity of knee extension and plantarflexion). Strength was measured with a hand-held dynamometer, and velocity with a gyroscope. A multiple regression analysis was performed with gait speed as the dependent variable and age, sex, and lower-limb function as independent variables. Plantarflexion velocity (β = 0.25) and plantarflexion strength (β = 0.21) were noted to be significant predictors of gait speed. These findings indicate that no-load plantarflexion velocity is more important than the strength of plantarflexion and knee extensions as a determinant of gait speed, suggesting that improvement in plantarflexion velocity may increase gait speed.
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Jennison T, Dalgleish J, Taher S, Chadwick C, Blundell C, Davies M, Davies H. Subtalar Arthrodesis Union Rates With and Without Adjacent Ankle Arthrodesis. Foot Ankle Int 2022; 43:1295-1299. [PMID: 35869646 DOI: 10.1177/10711007221110873] [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] [Indexed: 02/01/2023]
Abstract
BACKGROUND Subtalar arthrodesis is the surgical procedure commonly performed to treat subtalar arthritis. Subtalar arthrodesis may have a higher nonunion rate if there is a preexisting adjacent joint arthrodesis. The aim of this retrospective cohort study was to compare the subtalar arthrodesis union rate of patients with native tibiotalar joints to that of patients with prior tibiotalar arthrodesis. The secondary aim was to assess risk factors for nonunion. METHODS A retrospective cohort study of consecutive patients that underwent a subtalar arthrodesis in a single center between 2010 and 2020. The primary outcome of union was determined based on bridging callus on radiographs and clinical symptoms. If there was uncertainty, then a nonweightbearing CT was acquired. Chi-squared test and Mann-Whitney tests compared differences in demographics and risk factors for nonunion between groups. A logistical regression model was performed to determine risk factors for nonunion. RESULTS Eighteen patients had an adjacent ankle arthrodesis and 53 patients did not. The successful subtalar arthrodesis union rate in those with a preexisting ankle joint arthrodesis (44.4%) was approximately half that in those without an ankle joint arthrodesis (86.8%) (P < .001). On multivariate logistic regression, an adjacent ankle arthrodesis was the only significant risk factor for nonunion. The odds ratio of nonunion of the subtalar joint with an adjacent ankle arthrodesis present was 4.90 (95% CI 1.02-23.56) compared to a subtalar arthrodesis with a native ankle joint. In addition, 9.4% of patients without an ankle arthrodesis underwent a revision subtalar arthrodesis compared with 44.4% of those with an adjacent ankle arthrodesis (P = .001). CONCLUSION In our study, we found that patients undergoing a subtalar arthrodesis with an adjacent ankle arthrodesis have a significantly increased risk of nonunion compared with those undergoing a subtalar arthrodesis with a native ankle. Patients with a previously fused ankle need counseling about the high risk of nonunion and potential additional surgery.
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Affiliation(s)
- Toby Jennison
- Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - James Dalgleish
- Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Suhib Taher
- Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Carolyn Chadwick
- Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Chris Blundell
- Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Mark Davies
- Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
| | - Howard Davies
- Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, United Kingdom
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Changes in ankle and foot kinematic after fixed-bearing total ankle replacement. J Biomech 2022; 136:111060. [DOI: 10.1016/j.jbiomech.2022.111060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 02/14/2022] [Accepted: 03/21/2022] [Indexed: 11/18/2022]
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Dahmen J, Altink JN, Vuurberg G, Wijdicks CA, Stufkens SAS, Kerkhoffs GMMJ. Clinical efficacy of the Ankle Spacer for the treatment of multiple secondary osteochondral lesions of the talus. World J Orthop 2022; 13:178-192. [PMID: 35317406 PMCID: PMC8891659 DOI: 10.5312/wjo.v13.i2.178] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 11/18/2021] [Accepted: 01/06/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The Ankle Spacer was developed as a joint-sparing alternative to invasive end-stage surgeries. Currently, there are no clinical studies on the Ankle Spacer.
AIM To describe the operative technique and the clinical efficacy of the Ankle Spacer for the treatment of multiple, cystic osteochondral lesions of the talus in patients with failed prior operative treatment.
METHODS This is a prospective study during which patients were assessed preoperatively, at 2- and 6 wk, and at 3, 6, 12 and 24 mo postoperatively. Patients with multiple, cystic or large (≥ 15 mm) osteochondral lesions of the talus after failed prior surgery were included. The primary outcome measure was the numeric rating scale (NRS) for pain during walking at 2 years postoperatively. Secondary outcome measures included the NRS in rest and during stair climbing, the American Orthopaedic Foot and Ankle Society Hindfoot Score, the Foot and Ankle Outcome Score, the Short- Form 36 physical and mental component scale, and the Range of Motion (ROM). Radiographic evaluations were conducted to evaluate prosthetic loosening and subsidence. Revision rates and complications were also assessed.
RESULTS Two patients underwent an Ankle Spacer implantation on the talus. The NRS during walking improved from 6 and 7 preoperatively to 2 and 2 points postoperatively at 2 years, in patient 1 and 2, respectively. The other patient-reported outcome measures also improved substantially. There were no re-operations nor complications. Radiological imaging showed no loosening of the implant and no change of implant position.
CONCLUSION The Ankle Spacer showed clinically relevant pain reduction during walking, improvement in clinical outcomes as assessed with PROMs, and no complications or re-operations. This treatment option may evolve as a joint-sparing alternative to invasive end-stage surgeries.
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Affiliation(s)
- Jari Dahmen
- Department of Orthopedic Surgery, Amsterdam UMC, Location AMC, Amsterdam 1105AZ, Netherlands
| | - J Nienke Altink
- Department of Orthopedic Surgery, Amsterdam UMC, Location AMC, Amsterdam 1105AZ, Netherlands
| | - Gwendolyn Vuurberg
- Department of Orthopedic Surgery, Amsterdam UMC, Location AMC, Amsterdam 1105AZ, Netherlands
| | - Coen A Wijdicks
- Department of Orthopedic Research, Arthrex, Naples, FL 34108, United States
| | - Sjoerd AS Stufkens
- Department of Orthopedic Surgery, Amsterdam UMC, Location AMC, Amsterdam 1105AZ, Netherlands
| | - Gino MMJ Kerkhoffs
- Department of Orthopedic Surgery, Amsterdam UMC, Location AMC, Amsterdam 1105AZ, Netherlands
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Lullini G, Caravaggi P, Leardini A, Ortolani M, Mazzotti A, Giannini S, Berti L. Retrospective comparison between a two- and three-component ankle arthroplasty: clinical and functional evaluation via gait analysis. Clin Biomech (Bristol, Avon) 2020; 80:105180. [PMID: 32992079 DOI: 10.1016/j.clinbiomech.2020.105180] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 08/11/2020] [Accepted: 09/11/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND Total ankle arthroplasty is intended to restore physiological joint function in case of severe ankle arthritis. However, little is known about the functional outcome associated to different prosthesis designs. The aim of this retrospective study was to compare clinical and functional outcomes via gait analysis of two ankle prostheses designed to preserve ankle ligamentous isometry. METHODS Two groups of twenty patients who underwent ankle arthroplasty using either a three-component or a two-component prosthesis, were clinically evaluated, both pre-operatively and at minimal 2-year follow-up, by means of the AOFAS score. The spatio-temporal parameters, along with the kinetics and kinematics of the lower limb joints were also assessed at follow-up via gait analysis. The non-parametric Kruskal-Wallis test was used to assess differences in functional data between the two patient groups and with respect to those from a control group of 20 healthy subjects. FINDINGS All AOFAS scores significantly improved from pre-operative to post-operative assessment in both patient groups (P < 0.05). Most spatio-temporal and functional parameters in the patients were worse than those in the control group, but no significant differences were observed between the two arthroplasty groups. INTERPRETATION Both patient groups showed improved clinical outcome at follow-up, with a few differences in gait parameters. However, neither of the two groups achieved normal locomotion patterns. Since both prostheses were designed to preserve ligamentous isometry, the choice of one implant over the other should be due to preferences in the surgical approach and to other patient-specific factors.
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Affiliation(s)
- Giada Lullini
- Movement Analysis Laboratory and Functional-Clinical Evaluation of Prostheses, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Paolo Caravaggi
- Movement Analysis Laboratory and Functional-Clinical Evaluation of Prostheses, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy.
| | - Alberto Leardini
- Movement Analysis Laboratory and Functional-Clinical Evaluation of Prostheses, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Maurizio Ortolani
- Movement Analysis Laboratory and Functional-Clinical Evaluation of Prostheses, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Antonio Mazzotti
- Clinica Ortopedica e Traumatologica, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Sandro Giannini
- Clinica Ortopedica e Traumatologica, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Lisa Berti
- Movement Analysis Laboratory and Functional-Clinical Evaluation of Prostheses, IRCCS Istituto Ortopedico Rizzoli & Università di Bologna, Bologna, Italy
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