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Calliess T, Christen B, Theus-Steinmann C. [The combination of partial knee arthroplasties in knee osteoarthritis with an intact anterior cruciate ligament - a future model?]. ORTHOPADIE (HEIDELBERG, GERMANY) 2024; 53:255-264. [PMID: 38451274 DOI: 10.1007/s00132-024-04482-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/12/2024] [Indexed: 03/08/2024]
Abstract
BACKGROUND Preserving both cruciate ligaments in knee prosthetics enables approximately physiological joint kinematics. In this way, faster rehabilitation and a higher return-to-sports rate can be achieved. Accordingly, there are considerations to preserve both cruciate ligaments by combining two partial prostheses in the case of symptomatic bicompartmental (BiCom) knee osteoarthritis. METHODS This article summarizes the literature on BiCom arthroplasty and describes our own experiences from 54 consecutive cases with robotic-assisted technology. RESULTS According to current data, BiCom arthroplasty shows good clinical results, without being able to demonstrate a clear advantage over conventional TKA. The revision risk is slightly increased in the short-term interval, which could be positively addressed with robotic-assistance. The disadvantages are the increased implant costs and the risk of subsequent osteoarthritis. Accordingly, patients who may potentially take advantage of this treatment must be critically selected.
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Affiliation(s)
- Tilman Calliess
- articon Spezialpraxis für Gelenkchirurgie, Berner Prothetikzentrum, Salem-Spital, Schänzlistrasse 39, 3013, Bern, Schweiz.
| | - Bernhard Christen
- articon Spezialpraxis für Gelenkchirurgie, Berner Prothetikzentrum, Salem-Spital, Schänzlistrasse 39, 3013, Bern, Schweiz
| | - Carlo Theus-Steinmann
- articon Spezialpraxis für Gelenkchirurgie, Berner Prothetikzentrum, Salem-Spital, Schänzlistrasse 39, 3013, Bern, Schweiz
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Baba R, Ohkoshi Y, Maeda T, Suzuki K, Iwadate A, Iwasaki K, Onodera T, Kondo E, Iwasaki N. The Influence of Patello-Femoral Overstuffing After Modular Unlinked Bicompartmental Knee Arthroplasty (BiKA) for Medial Tibio-Femoral and Patello-Femoral Osteoarthritis of the Knee. J Arthroplasty 2024; 39:638-644. [PMID: 37633506 DOI: 10.1016/j.arth.2023.08.069] [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: 04/26/2023] [Revised: 08/18/2023] [Accepted: 08/19/2023] [Indexed: 08/28/2023] Open
Abstract
BACKGROUND The factors affecting results after bicompartmental knee arthroplasty (BiKA) have not been fully elucidated. This major ligament-preserving procedure may be more susceptible to overstuffing of the patello-femoral (PF) joint than the major ligament-sacrificing total knee arthroplasty. Currently, we investigated the effect of PF overstuffing after BiKA on its clinical outcome. METHODS There were 71 patients (74 knees) who underwent modular unlinked BiKA at our clinic who had a follow-up of 5 to 9 years. Final follow-up results were assessed by evaluating knee range of motion, the 2011 Knee Society Score (2011KSS), Japanese Knee Osteoarthritis Measure, and radiological findings. The degree of postoperative PF overstuffing was evaluated by computed tomography and magnetic resonance images for 55 knees, and the correlation between the degree of overstuffing and postoperative clinical results were examined. RESULTS Overall clinical results improved significantly after surgery without any revision cases. The X-ray measurements showed the improved coronal alignments and the appropriate implant installation angles. Higher degree of postoperative PF overstuffing caused by insufficient amount of osteotomy on the anterior surface of the femur correlated with worse postoperative total 2011KSS at 2 years after surgery (Spearman's rank correlation coefficient (rs) = -0.387, P = .004), as opposed to no correlation at the time of the final follow-up (Spearman's rank correlation coefficient = 0.068, P = .623). CONCLUSION Modular unlinked BiKA provided patients with a high level of satisfaction and functional improvement over 5 to 9 years postoperatively. However, because PF overstuffing affects initial patient satisfaction, the amount of osteotomy should be determined carefully during the surgery.
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Affiliation(s)
- Rikiya Baba
- Department of Orthopedic Surgery, Hakodate Orthopedics Clinic, Hakodate, Japan; Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Yasumitsu Ohkoshi
- Department of Orthopedic Surgery, Hakodate Orthopedics Clinic, Hakodate, Japan
| | - Tatsunori Maeda
- Department of Orthopedic Surgery, Hakodate Orthopedics Clinic, Hakodate, Japan
| | - Ko Suzuki
- Department of Orthopedic Surgery, Hakodate Orthopedics Clinic, Hakodate, Japan
| | - Akane Iwadate
- Department of Orthopedic Surgery, Hakodate Orthopedics Clinic, Hakodate, Japan
| | - Koji Iwasaki
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Tomohiro Onodera
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Eiji Kondo
- Centre for Sports Medicine, Hokkaido University Hospital, Sapporo, Japan
| | - Norimasa Iwasaki
- Department of Orthopaedic Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
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Imhoff AB, Bartsch E, Becher C, Behrens P, Bode G, Cotic M, Diermeier T, Falk H, Feucht MJ, Haupt U, Hinterwimmer S, Holz J, Hutter R, Kaiser R, Knoblauch T, Nebelung W, Niemeyer P, O’Donnel T, Pagenstert G, Patzer T, Rose T, Rupp MC, Tischer T, Venjakob AJ, Vogt S, Pogorzelski J. The lack of retropatellar resurfacing at index surgery is significantly associated with failure in patients following patellofemoral inlay arthroplasty: a multi-center study of more than 260 patients. Knee Surg Sports Traumatol Arthrosc 2022; 30:1212-1219. [PMID: 33811265 PMCID: PMC9007771 DOI: 10.1007/s00167-021-06544-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Accepted: 03/18/2021] [Indexed: 11/24/2022]
Abstract
PURPOSE To evaluate the clinical outcomes of patients with a minimum 2-year follow-up following contemporary patellofemoral inlay arthroplasty (PFIA) and to identify potential risk factors for failure in a multi-center study. METHODS All patients who underwent implantation of PFIA between 09/2009 and 11/2016 at 11 specialized orthopedic referral centers were enrolled in the study and were evaluated retrospectively at a minimum 2-year follow-up. Clinical outcomes included the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score, the Knee Injury and Osteoarthritis Outcome Score (KOOS), the Tegner Scale, the visual analogue scale (VAS) for pain, and subjective patient satisfaction. Pre- and perioperative risk factors were compared among failures and non-failures to determine potential risk factors. RESULTS A total of 263 patients (85% follow-up rate) could be enrolled. The mean age at the time of index surgery was 49 ± 12 years with a mean postoperative follow-up of 45 ± 18 months. The overall failure rate was 11% (28 patients), of which 18% (5 patients) were patients with patella resurfacing at index surgery and 82% (23 patients) were patients without initial patella resurfacing. At final follow-up, 93% of the patients who did not fail were satisfied with the procedure with a mean transformed WOMAC Score of 84.5 ± 14.5 points, a mean KOOS Score of 73.3 ± 17.1 points, a mean Tegner Score of 3.4 ± 1.4 points and a mean VAS pain of 2.4 ± 2.0 points. An increased BMI was significantly correlated with a worse postoperative outcome. Concomitant procedures addressing patellofemoral instability or malalignment, the lack of patellofemoral resurfacing at the index surgery and a high BMI were significantly correlated with failure in our patient cohort. CONCLUSION Patellofemoral inlay arthroplasty shows high patient satisfaction with good functional outcomes at short-term follow-up and thus can be considered a viable treatment option in young patients suffering from isolated patellofemoral arthritis. Patellar resurfacing at index surgery is recommended to decrease the risk of failure. LEVEL OF EVIDENCE Retrospective case series, Level IV.
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Affiliation(s)
- Andreas B. Imhoff
- Department of Orthopedic Sports Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Eva Bartsch
- Department of Orthopedic Sports Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Christoph Becher
- ATOS Clinic Heidelberg, Bismarckstr. 9-15, 69115 Heidelberg, Germany
| | - Peter Behrens
- Orthodok, Tonndorfer Hauptstraße 71, 22045 Hamburg, Germany
| | - Gerrit Bode
- Department of Orthopedics, University Hospital of Freiburg, Hugstetter Str. 55, 79106 Freiburg, Germany
| | - Matthias Cotic
- Department of Orthopedic Sports Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Theresa Diermeier
- Department of Orthopedic Sports Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Holger Falk
- Gelenkzentrum Rhein-Main, Frankfurter Straße 94, 65239 Hochheim am Main, Germany
| | - Matthias J. Feucht
- Department of Orthopedic Sports Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Ulrich Haupt
- Orthomotion, City Clinic Thun, Marktgasse 17, 3600 Thun, Switzerland
| | | | | | - René Hutter
- Department of Orthopedics, Kantonspital Graubünden, Loëstrasse 99, 7000 Chur, Switzerland
| | - René Kaiser
- Orthocentrum, Hansastr. 1-3, 20149 Hamburg, Germany
| | - Tobias Knoblauch
- Gelenkzentrum Leipzig, Richard-Lehmann-Str. 21, 04275 Leipzig, Germany
| | - Wolfgang Nebelung
- Department of Sport Orthopedics, St. Vinzenz Hospital, Schloßstr. 85, 40477 Düsseldorf, Germany
| | - Philipp Niemeyer
- Department of Orthopedics, University Hospital of Freiburg, Hugstetter Str. 55, 79106 Freiburg, Germany
| | - Turlough O’Donnel
- Center for Orthopaedics, Beacon Hospital, Sandyford, Dublin 18, Dublin, Ireland
| | - Geert Pagenstert
- Knee Institute Basel, CLARAHOF Clinic of Orthopaedic Surgery, MERIAN-ISELIN-Hospital, Swiss Olympic Medical Center, Föhrenstr. 2, 4054 Basel, Switzerland
| | - Thilo Patzer
- Orthopädie-Zentrum, Schön Klinik, Am Heerdter Krankenhaus 2, 40549 Düsseldorf, Germany
| | - Tim Rose
- Gelenkzentrum Leipzig, Richard-Lehmann-Str. 21, 04275 Leipzig, Germany
| | - Marco C. Rupp
- Department of Orthopedic Sports Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
| | - Thomas Tischer
- Department of Orthopedics, University Hospital of Rostock, Doberanerstr. 142, 18057 Rostock, Germany
| | - Arne J. Venjakob
- Department of Sport Orthopedics, St. Vinzenz Hospital, Schloßstr. 85, 40477 Düsseldorf, Germany
| | - Stephan Vogt
- Department of Sports Orthopedics, Hessing Stiftung, Hessingstr. 17, 86199 Augsburg, Germany
| | - Jonas Pogorzelski
- Department of Orthopedic Sports Medicine, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675 Munich, Germany
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Benignus C, Meier M, Best R, Beckmann J. [When nothing else works: patellofemoral joint arthroplasty]. SPORTVERLETZUNG-SPORTSCHADEN 2021; 35:227-233. [PMID: 34883522 DOI: 10.1055/a-1523-9937] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Patellofemoral joint replacement is the best treatment option available for isolated patellofemoral arthritis. Especially young patients should be operated on with bone-sparing techniques that also preserve the soft tissues, since these patients are very likely to be revised at some point in their lifetime. Correct patient selection is important for the success of surgery and should include a meticulous clinical examination and imaging. Special attention should be paid to additional pathologies that may also need to be addressed. For the trochlea, there are two different options for treatment with the inlay and onlay system. The retropatellar surface should be replaced. Patellofemoral joint replacement is still rarely performed, so treatment in specialised centres is recommended. National joint registry data show high revision rates, while data from centres show promising results.
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[Patellofemoral inlay implants-an innovation in patellofemoral joint arthroplasty?]. DER ORTHOPADE 2021; 50:136-142. [PMID: 33355685 DOI: 10.1007/s00132-020-04059-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Isolated arthrosis of the patellofemoral joint is a rare and complex disease. After conservative therapy has been exhausted, the orthopedist has various soft-tissue and bone reconstructive procedures as well as cartilage regenerative procedures at his hands. In cases of failed or unsatisfactory therapy, patellofemoral arthroplasty continues to be controversially discussed as an alternative therapy. A closer look at these studies reveals promising results with the correct indication and patient selection. The different prosthesis designs provide good postoperative results while considering general and specific risks. The current generation of patellofemoral inlay prostheses shows high patient satisfaction with significant improvements in knee function and pain relief in mid-term outcomes. However, a relatively high revision rate must be considered.
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7
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Patella alta and patellar subluxation might lead to early failure with inlay patello-femoral joint arthroplasty. Knee Surg Sports Traumatol Arthrosc 2019; 27:685-691. [PMID: 29785448 DOI: 10.1007/s00167-018-4965-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 04/27/2018] [Indexed: 10/16/2022]
Abstract
PURPOSE With the growing interest in resurfacing procedures, several new implants have been recently introduced for isolated patello-femoral joint arthroplasty (PFA). However, not much data are available for these new techniques or about the right indications for each type of implant. METHODS Out of a retrospective cohort of 20 inlay PFA, 11 PFA with an elevated Insall-Salvati index and an increased patello-femoral congruence angle showed an initial satisfactory result, but presented thereafter with recurrent pain and "clunk" phenomena. They were all revised after a median time of 25 months (range 8-28 months) into an onlay technique PFA and analyzed for their failure mode and revision technique. RESULTS Clinical symptoms such as clunking, as well as abraded areas craniolateral of the inlay implant found intraoperatively, were the main observations of this study. The modified Insall-Salvati index (mISI) was significantly higher in the revised knees compared to the unrevised (median 1.8 versus 1.6; p = 0.041). VAS and KSS significantly improved after revision (median VAS reduction in pain of 4.0 points, median KSS improvement of 20.0 points; p < 0.05). CONCLUSION Patients with high-normal patellar height index or patella alta, as well as a craniolateral type of arthritis with additional lateralization, should be considered contra-indicated for an inlay technique PFA. They could be considered for a PFA system reaching further proximal into the distal femur. An onlay PFA can be an option for early revision of failed inlay implants. The clinical relevance of this study is that patella alta and patellar subluxation are more difficult to adjust for with an inlay PFJ component. LEVEL OF EVIDENCE Level IV.
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Narkbunnam R, Electricwala AJ, Huddleston JI, Maloney WJ, Goodman SB, Amanatullah DF. Suboptimal patellofemoral alignment is associated with poor clinical outcome scores after primary total knee arthroplasty. Arch Orthop Trauma Surg 2019; 139:249-254. [PMID: 30483917 DOI: 10.1007/s00402-018-3073-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND Proper patellofemoral alignment is an important goal in total knee arthroplasty (TKA). Acceptable patellar alignment is defined as patellar tilt less than or equal to 5° and patellar displacement less than or equal to 5 mm. Previous studies reported an incidence of post-operative patellar malalignment in TKA from 7 to 35%. However, correlation between patellar malalignment and clinical outcome after TKA remains unclear. The purpose of the present study was to evaluate the effect of patellar tilt and displacement on the clinical outcome of TKA. METHODS A retrospective review of 138 primary TKAs with a minimum of 2 year follow-up is reported. Pre-operative and post-operative mechanical axis, patellar tilting angle and patellar displacement were measured. Clinical outcomes were evaluated by the knee functional scores including the Knee Society Score (KSS), Knee injury and Osteoarthritis Outcome Score (KOOS), and Western Ontario McMaster University Osteoarthritis Index (WOMAC) at final follow-up. RESULTS Forty-two (30%) primary TKAs had suboptimal patellofemoral alignment with a patellar tilt angle greater than 5° or lateral patellar displacement of more than 5 mm. There was no statistical difference in pre-operative mechanical axis, pre-operative patellar tilt angle, or pre-operative lateral patellar displacement between the primary TKAs with proper patellofemoral alignment and those with suboptimal alignment. Patients with post-operative patellar tilt or displacement had clinically significant reductions in KSS, KOOS, and WOMAC when compared with patients without post-operative patellar tilt or displacement. The odds of having a fair or poor post-operative result, an odds ratio of 3.4 (95% CI 1.6-7.2) for KSS, 6.4 (95% CI 2.9-14.2) for KOOS, and 5.9 (95% CI 2.6-13.5) for WOMAC, were associated with suboptimal patellofemoral alignment. CONCLUSION Establishing proper patellofemoral alignment remains an essential goal of primary TKA. There is a strong association between suboptimal post-operative patellofemoral alignment and poor clinical outcome scores after primary TKA.
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Affiliation(s)
- Rapeepat Narkbunnam
- Siriraj Hospital, Mahidol University, 27 Serivilla Soi 2, Sirnakarin Road, Pravate, Bangkok, 10250, Thailand
| | | | - James I Huddleston
- Stanford University Medical Center Outpatient Center, 450 Broadway St., M/C 6342, Redwood City, CA, 94063, USA
| | - William J Maloney
- Stanford University Medical Center Outpatient Center, 450 Broadway St., M/C 6342, Redwood City, CA, 94063, USA
| | - Stuart B Goodman
- Stanford University Medical Center Outpatient Center, 450 Broadway St., M/C 6342, Redwood City, CA, 94063, USA
| | - Derek F Amanatullah
- Stanford University Medical Center Outpatient Center, 450 Broadway St., M/C 6342, Redwood City, CA, 94063, USA.
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Steinbrück A, Schröder C, Woiczinski M, Glogaza A, Müller PE, Jansson V, Fottner A. A lateral retinacular release during total knee arthroplasty changes femorotibial kinematics: an in vitro study. Arch Orthop Trauma Surg 2018; 138:401-407. [PMID: 29188420 DOI: 10.1007/s00402-017-2843-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Lateral retinacular release (LRR) is a common procedure during total knee arthroplasty (TKA), especially if patellar maltracking is observed intraoperatively. The impact of LRR on patellofemoral kinematics is well-examined, but the influence on femorotibial kinematics requires more elucidation. Therefore, the aim of this study was to evaluate the effects of LRR on femorotibial kinematics in vitro. MATERIALS AND METHODS A fixed bearing TKA was implanted in six human knee specimens. Femorotibial kinematics were measured dynamically through the use of a custom-constructed knee rig which flexes the knee from 20° to 120° under weight bearing conditions. Measurements were performed before and after LRR. LRR was performed completely including transection of synovium, retinaculum and tractus fibers. For the registration of tibiofemoral kinematics a 3-dimensional-ultrasound-based motion analysis system was used. RESULTS LRR revealed a significant reduction of femoral rollback at the lateral compartment (9.4 ± 5.0 vs 7.8 ± 9.4 mm; p < 0.01), whereas the present decrease of femoral rollback at the medial compartment was not significant (3.4 ± 4.7 vs 2.3 ± 5.9 mm; p = 0.34). Accordingly, LRR significantly reduced internal rotation of the tibia (0.8°; p < 0.01). CONCLUSION The results suggest that LRR significantly decreases lateral femoral rollback as well as internal rotation of the tibia, probably by changing the tension of the iliotibial band. When performing a LRR in clinical routine, surgeons should be aware of altering not only patellofemoral kinematics but also the femorotibial kinematics.
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Affiliation(s)
- Arnd Steinbrück
- Department of Orthopedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Campus Grosshadern, Marchioninistr. 15, 81377, Munich, Germany.
| | - Christian Schröder
- Department of Orthopedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Campus Grosshadern, Marchioninistr. 15, 81377, Munich, Germany
| | - Matthias Woiczinski
- Department of Orthopedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Campus Grosshadern, Marchioninistr. 15, 81377, Munich, Germany
| | - Alexander Glogaza
- Department of Orthopedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Campus Grosshadern, Marchioninistr. 15, 81377, Munich, Germany
| | - Peter E Müller
- Department of Orthopedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Campus Grosshadern, Marchioninistr. 15, 81377, Munich, Germany
| | - Volkmar Jansson
- Department of Orthopedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Campus Grosshadern, Marchioninistr. 15, 81377, Munich, Germany
| | - Andreas Fottner
- Department of Orthopedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich (LMU), Campus Grosshadern, Marchioninistr. 15, 81377, Munich, Germany
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Baumann F, Krutsch W, Worlicek M, Kerschbaum M, Zellner J, Schmitz P, Nerlich M, Tibesku C. Reduced joint-awareness in bicruciate-retaining total knee arthroplasty compared to cruciate-sacrificing total knee arthroplasty. Arch Orthop Trauma Surg 2018; 138:273-279. [PMID: 29124363 DOI: 10.1007/s00402-017-2839-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Indexed: 12/17/2022]
Abstract
PURPOSE There is rising impact of patient-reported outcome (PRO) measurement in joint arthroplasty over the past years. Bicruciate-retaining implants have shown more physiologic knee kinematics and provide superior proprioceptive capacities. The aim of this study was to evaluate if the functional properties of this new implant design lead to improved PRO results after total knee arthroplasty (TKA). METHODS This prospective, controlled trial compares PRO of bicruciate-retaining total knee arthroplasty (BCR-TKA) to unicondylar knee arthroplasty (UKA) and standard posterior-stabilized total knee arthroplasty (PS-TKA). We evaluated 102 patients (34 patients in each group) 18 months postoperatively after knee arthroplasty. Primary outcome measure was the Forgotten Joint Score (FJS). RESULTS The BCR-group showed the same level of joint awareness as the UKA-group (p = 0.999). The second control group of PS-TKA patients had a lower mean score value in the FJS compared to the BCR-group (p = 0.035) and UKA-group (p = 0.031). There was no correlation of age, gender, body mass index (BMI) and the FJS. No relevant floor- or ceiling effects occurred. CONCLUSIONS This study found reduced joint awareness for BCR-TKA compared to a standard total knee arthroplasty. The score values of the BCR-group were equal to the UKA-group. Further prospective, randomized studies to investigate long-term survivorship of bicruciate-retaining implants are needed. LEVEL OF EVIDENCE Level II.
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Affiliation(s)
- Florian Baumann
- Department of Trauma Surgery, Regensburg University Medical Center, 93042, Regensburg, Germany.
| | - Werner Krutsch
- Department of Trauma Surgery, Regensburg University Medical Center, 93042, Regensburg, Germany
| | - Michael Worlicek
- Department of Trauma Surgery, Regensburg University Medical Center, 93042, Regensburg, Germany
| | - Maximilian Kerschbaum
- Department of Trauma Surgery, Regensburg University Medical Center, 93042, Regensburg, Germany
| | - Johannes Zellner
- Department of Trauma Surgery, Regensburg University Medical Center, 93042, Regensburg, Germany
| | - Paul Schmitz
- Department of Trauma Surgery, Regensburg University Medical Center, 93042, Regensburg, Germany
| | - Michael Nerlich
- Department of Trauma Surgery, Regensburg University Medical Center, 93042, Regensburg, Germany
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