Publications by authors named "Rainer Siebold"

Purpose: To evaluate mid- to long-term clinical outcomes after arthroscopic bucket-handle meniscal tear (BHMT) repair and to assess the impact of concurrent anterior cruciate ligament reconstruction (ACLR).

Methods: A comparative retrospective case series with blinded outcome assessment was conducted. All consecutive patients treated with arthroscopic BHMT repair with or without concurrent ACLR between 2001 and 2021 were eligible for inclusion.

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Purpose: The optimal treatment approach for the complex pathology of meniscal insufficiency and coexisting full-thickness cartilage defects remains unclear. The purpose of this study was to evaluate the viability, safety, and efficacy of this combined surgical approach at medium-term follow-up.

Methods: This is a single-centre longitudinal study with blinded outcome assessment.

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Background: Matrix-associated autologous chondrocyte implantation (ACI) is a well-established treatment for cartilage defects. High-level evidence at midterm follow-up is limited, especially for ACI using spheroids (spherical aggregates of ex vivo expanded human autologous chondrocytes and self-synthesized extracellular matrix).

Purpose: To assess the safety and efficacy of 3-dimensional matrix-associated ACI using spheroids to treat medium to large cartilage defects on different locations in the knee joint (patella, trochlea, and femoral condyle) at 5-year follow-up.

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Purpose: To report second-look arthroscopic assessment after all-arthroscopic autologous chondrocyte implantation (ACI) for articular cartilage defects at the patella.

Methods: A second-look arthroscopy after all-arthroscopic ACI using chondrospheres (ACT3D) was performed in 30 patients with 30 full-thickness retropatellar cartilage defects. The mean time from ACI to second-look arthroscopy was 14.

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Article Synopsis
  • There's no clear, standardized definition of returning to sport (RTS) after an ACL injury, leading to disagreements on how to guide recovery and reintegration into activities.
  • The Panther Symposium gathered international ACL experts to create consensus statements outlining a clear definition of RTS, a progression framework, and clinical guidance on testing and decision-making.
  • The consensus emphasizes the need for a criteria-based approach incorporating physical, psychological, and contextual factors for RTS, while calling for further research on optimal testing and recovery methods.
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Article Synopsis
  • Treatment strategies for ACL injuries are evolving, based on low-level evidence, leading to a consensus meeting with 66 international experts to explore operative versus nonoperative management.
  • The meeting resulted in 13 statements regarding ACL treatment, with 11 reaching consensus—9 unanimously supported and 2 having strong consensus.
  • Key findings recommend early anatomic ACL reconstruction for active individuals involved in dynamic sports to prevent further injuries, while nonoperative treatment is suitable for those returning to lower-risk activities.
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According to recent anatomic studies, the anterior cruciate ligament (ACL) appears to be a flat, "ribbon-like" structure, with a thin, oval-shaped insertion on the femur and a C-shaped tibial insertion. According to this anatomy, we describe an ACL-reconstruction technique that aims to approximate this natural anatomy. The basic principle of this technique is not to use conventional round tunnels but create tunnel shapes that resemble more closely the original ACL insertion sites.

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Purpose: The aim of this study was to investigate the effect of product dose in autologous chondrocyte implantation (ACI) for the treatment of full-thickness cartilage defects of the knee and to assess its influence on clinical and morphological mid-term outcome.

Methods: Seventy-five patients were included in this single-blind, randomised, prospective, controlled clinical trial. Patients were assigned randomly to three different dose groups [low (3-7 spheroids/cm), medium (10-30 spheroids/cm), or high (40-70 spheroids/cm)] and assessed using standardised clinical and morphological scoring systems (KOOS, IKDC, MOCART) for 4 years following the intervention.

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Aim: Cartilage defects of the patella are considered as a problematic entity. Purpose of the present study was to evaluate the outcome of patients treated with autologous chondrocyte implantation (ACI) for cartilage defects of the patella in comparison to patient with defects of the femoral condyles.

Patients And Methods: 73 patients with a follow-up of 5 years have been included in this subgroup analysis of the randomized controlled clinical trial (RCT).

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Background: Autologous chondrocyte implantation (ACI) is an established method for treating cartilage defects in the knee of adult patients. However, less is known about its effectiveness in adolescents.

Hypothesis: Third-generation matrix-associated ACI (MACI) using spheroids (co.

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In October 2017, the International Olympic Committee hosted an international expert group of physical therapists and orthopaedic surgeons who specialize in treating and researching pediatric anterior cruciate ligament (ACL) injuries. The purpose of this meeting was to provide a comprehensive, evidence-informed summary to support the clinician and help children with ACL injury and their parents/guardians make the best possible decisions. Representatives from the following societies attended: American Orthopaedic Society for Sports Medicine; European Paediatric Orthopaedic Society; European Society for Sports Traumatology, Knee Surgery, and Arthroscopy; International Society of Arthroscopy, Knee Surgery and Orthopaedic Sports Medicine; Pediatric Orthopaedic Society of North America; and Sociedad Latinoamericana de Artroscopia, Rodilla, y Deporte.

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In October 2017, the International Olympic Committee hosted an international expert group of physiotherapists and orthopaedic surgeons who specialise in treating and researching paediatric ACL injuries. Representatives from the American Orthopaedic Society for Sports Medicine, European Paediatric Orthopaedic Society, European Society for Sports Traumatology, Knee Surgery & Arthroscopy, International Society of Arthroscopy Knee Surgery and Orthopaedic Sports Medicine, Pediatric Orthopaedic Society of North America and Sociedad Latinoamericana de Artroscopia, Rodilla y Deporte attended. Physiotherapists and orthopaedic surgeons with clinical and research experience in the field, and an ethics expert with substantial experience in the area of sports injuries also participated.

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In October 2017, the International Olympic Committee hosted an international expert group of physiotherapists and orthopaedic surgeons who specialise in treating and researching paediatric anterior cruciate ligament (ACL) injuries. Representatives from the American Orthopaedic Society for Sports Medicine, European Paediatric Orthopaedic Society, European Society for Sports Traumatology, Knee Surgery and Arthroscopy, International Society of Arthroscopy Knee Surgery and Orthopaedic Sports Medicine, Pediatric Orthopaedic Society of North America, and Sociedad Latinoamericana de Artroscopia, Rodilla y Deporte attended. Physiotherapists and orthopaedic surgeons with clinical and research experience in the field, and an ethics expert with substantial experience in the area of sports injuries also participated.

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The management of anterior cruciate ligament (ACL) injuries in the skeletally immature and adolescent patient remains an area of controversy in sports medicine. This study, therefore, summarizes and discusses the current evidence related to treating pediatric and adolescent patients who sustain an ACL injury. The current literature identifies a trend towards ACL reconstruction as the preferred treatment option for ACL injuries in the young, largely justified by the risk of further structural damage to the knee joint.

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Background: This study was conducted to assess the efficacy and safety of the three dose levels of the three-dimensional autologous chondrocyte implantation product chondrosphere® in the treatment of cartilage defects (4-10 cm) of knee joints. We hereby report the safety results for a 36-month post-treatment observation period.

Methods: This was a prospective phase II trial with a clinical intervention comprising biopsy for culturing spheroids and their subsequent administration (level of evidence: I).

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Purpose: To analyze the clinical outcome and cartilage regeneration after all-arthroscopic Autologous Chondrocyte Implantation (ACI) using chondrospheres® (ACT3D) for the treatment of full-size articular cartilage lesions at the knee.

Methods: Thirty consecutive patients treated by all-arthroscopic ACI for full-size articular cartilage lesions in an otherwise healthy knee were enrolled. The defects were located on the femoral condyles (n = 18), in the trochlea (n = 7) and at the patella (n = 5).

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Background: Although autologous chondrocyte implantation (ACI) has been established as a standard treatment for large full-thickness cartilage defects, the effect of different doses of autologous chondrocyte products on structural outcomes has never been examined.

Hypothesis: In ACI, the dose level may have an influence on medium-term magnetic resonance morphological findings after treatment.

Study Design: Randomized controlled trial; Level of evidence, 1.

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Purpose: To analyse the clinical, rotational and radiological (MRI) results of paediatric anatomical "C-shaped" double-bundle (DB) anterior cruciate ligament (ACL) reconstruction with anteromedial and posteromedial bundle compared to single-bundle (SB) ACL reconstruction.

Methods: Between 2008 and 2014, 57 consecutive patients received a paediatric ACL reconstruction with open physis and were allocated into two groups, according to the surgical procedure. Transepiphyseal SB technique was used until 2012 and DB consecutively thereafter.

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Purpose: To report arthroscopic second look as well as clinical results after arthroscopic autologous chondrocyte implantation (ACI) for articular cartilage repair at the knee joint.

Methods: A second-look assessment after arthroscopic ACI using spheroides was performed in 41 patients with 57 full-size articular cartilage defects of the knee. The median time from ACI to second-look arthroscopy was 10 (6-72) months.

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Article Synopsis
  • The study aimed to investigate the morphology of the tibial anterior cruciate ligament (ACL) using histological methods on cadaveric knees.
  • The research involved analyzing sections of the tibial ACL insertion, revealing specific anatomical details, such as the sizes and relationships with surrounding structures like the medial tibial spine and lateral meniscus.
  • The findings indicated a unique 'duck-foot-like' shape of the bony tibial ACL insertion and offer insights that could enhance the understanding and techniques used in anatomical ACL reconstruction.
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Purpose: The aim of this study was to evaluate hip muscle flexion strength in patients who underwent anterior cruciate ligament (ACL) reconstruction with patellar or hamstrings tendon graft and compare them with healthy controls.

Methods: Sixty-eight male ACL deficient patients who underwent reconstruction (36 patients with hamstrings tendon graft and 32 patients with patellar tendon graft; randomized selection of type of graft) in our department, between July 2011 and July 2012, were enrolled in this randomised prospective study. Also 64 healthy male weekend athletes participated in the study as a control group.

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