Research
1. Total Number of Publications
According to PubMed search data, Carl Haasper has approximately 130 PubMed-indexed publications over the past 25 years[1]. This aligns with his profile noting “over a hundred” Medline-listed papers[2]. These publications span from 2004 (his first indexed paper) through 2025, reflecting an active research career primarily in orthopaedic surgery and trauma. The total output (~130 papers) underscores a robust publication record in peer-reviewed journals.
2. Publications per Year (Time Series Trend)
Over the last two decades, Haasper’s publication activity shows a clear temporal trend. Early in his career (mid-2000s) he published only 1–5 papers per year, but this output increased sharply around 2007–2013. His most prolific years were 2012 (22 papers) and 2013 (23 papers)[3], coinciding with extensive trauma research and clinical studies during his tenure at Hannover Medical School. After 2014, productivity declined to a steadier pace of ~2–7 publications annually[4]. Notably, 2014 marked a transition with 12 papers, after which output stabilized at a lower rate, possibly reflecting a greater focus on clinical leadership roles. By 2020–2023 he averaged 2–4 papers per year[5,6]. Overall, the time series indicates an initial growth and peak in academic output followed by a tapering in recent years.
3. Frequency Distribution of Journals
Haasper’s ~130 publications are distributed across numerous journals, with a concentration in a few key outlets. The most frequent venue is Der Unfallchirurg (a German orthopaedic trauma journal), reflecting his background in trauma surgery. Der Unfallchirurg alone accounts for roughly 10 or more of his papers (e.g. contributions in 2006, 2009, 2010, 2012, 2014, 2019)[7][8]. Many of these were co-authored studies on injury prevention, accident analysis, and orthopedic techniques (often published in German)[9][10].
Beyond that, Haasper has published widely in international orthopedic journals. Notable examples include multiple papers in the Journal of Arthroplasty (hip/knee replacement research, ~3 papers) and in Knee Surgery, Sports Traumatology, Arthroscopy (KSSTA) (~3 papers, focusing on knee cartilage and arthroplasty)[11][12]. He also contributed to Joints (two review articles on knee revision implants in 2017 and 2019)[13][14]. Other journals appear once or twice in his bibliography: for instance, the Bone & Joint Journal (BJJ)[15], Journal of Orthopaedic Research[16], International Orthopaedics[17], and an orthopedic specialty open-access journal (e.g. World Journal of Orthopedics, as indicated by a 2015 article on obesity in arthroplasty). This distribution shows Haasper’s work spanning both German-language surgical journals and high-impact international journals, with trauma and joint surgery being the dominant themes.
4. Citation Metrics and Estimated h-Index
Haasper’s publications have garnered a significant number of citations, indicating their influence in the field. According to his academic profile and Google Scholar data, his total citation count exceeds 4,000, and his h-index is in the mid-30s[18]. Specifically, Web of Science reports an h-index of 27, while Google Scholar (which captures a broader range of citations) reports an h-index of about 35[18]. This means he has ~35 papers with at least 35 citations each – a solid indicator of impact in orthopaedic and trauma research.
These metrics reflect both highly cited individual papers and consistent citation accrual across many works. For instance, his total Web of Science citations ~2,000 (excluding self-citations) versus ~4,200 citations on Google Scholar illustrate the difference in coverage[18]. The h-index in the 30s is noteworthy for an orthopaedic surgeon-scientist, suggesting that numerous publications (particularly those in the early 2010s) have become well-cited in the literature. Overall, Haasper’s citation profile indicates strong academic influence, with a mixture of clinical studies and reviews contributing to his citation count. (It’s worth noting that his work is primarily academic; minimal citations in patents or policy documents have been noted[19][20], signifying that his impact is largely within the scientific and medical community.)
5. Most Important Publication
Evaluating Carl Haasper’s most important publication involves considering citation count, journal prestige (impact factor), and topical relevance. One standout is a 2014 paper on rotating-hinge knee prostheses in the Bone & Joint Journal (BJJ)[15]. Co-authored with T. Gehrke and D. Kendoff, this article (“The role of hinges in primary total knee replacement”) addressed best practices for constrained knee implants. It is published in a top-tier orthopaedics journal (Bone & Joint Journal has a high impact factor) and has accrued over 100 citations to date, making it one of Haasper’s most cited works[21][22]. The paper’s high citation count suggests it filled an important knowledge gap regarding when to use hinged knee replacements in primary total knee arthroplasty. Its conclusions – that hinges should be reserved for select indications (ligament insufficiency, severe deformity, etc.) – have been widely referenced in subsequent studies[23]. By citation impact and clinical significance, this 2014 hinge knee study emerges as a key publication in Haasper’s career.
Another notable publication is his 2022 article in EMBO Molecular Medicine on microRNA-19 and osteoporosis[24]. While more recent (and thus fewer citations so far), it appeared in a very high-impact journal, highlighting Haasper’s involvement in translational research beyond clinical surgery. Additionally, an influential 2014 study on knee cartilage repair (microfracture technique) in Knee Surgery, Sports Traumatology, Arthroscopy is often highlighted[11]. Haasper’s role there was as a commentary author, it underscores his expertise in sports orthopaedics.
Considering the criteria collectively, the 2014 BJJ hinge knee paper stands out for combining high citations, a respected journal, and direct relevance to orthopaedic surgical practice. Its prominence is further supported by the fact that it was authored with leaders in the field (Gehrke, Kendoff) and has influenced both research and surgical decision-making globally.
6. Authorship Roles and Collaborations
Carl Haasper’s publication record shows a diversity of authorship roles and extensive co-authorships. In many early papers he is the first author, indicating he led the research or writing. For example, several of his 2010–2014 papers list “Haasper C.” as the first author[25][26], including both German-language articles and international studies. As his career progressed, Haasper also took on the last author (senior author) role, guiding work by junior colleagues. An instance is a 2014 International Orthopaedics study where Haasper is the last author in a multi-center team, suggesting he oversaw the project on infection diagnostics[17]. This balance of first- and last-author positions demonstrates that Haasper evolved from performing research himself to mentoring and leading research teams.
In terms of collaborations, Haasper has worked with a broad network of co-authors, spanning Germany and international centers. He frequently co-authored with Christian Krettek (a renowned trauma surgeon at Hannover) during his early trauma research[27], and with Dietmar Otte (a traffic accident researcher) on injury mechanism studies. Later, during his fellowship at Hamburg’s ENDO-Klinik, he collaborated with Thorsten Gehrke and Daniel Kendoff, producing influential arthroplasty papers[22]. His co-authors also include specialists like Akos Zahar (infection surgery), Maurilio Marcacci (knee reconstruction)[28], and others from Europe and the US, reflecting multidisciplinary and international research efforts. Many publications are multi-author works – for example, a German accident prevention consensus had 15 authors including Haasper[29] – indicating his ability to contribute to large collaborative studies.
Overall, Haasper’s bibliography suggests he has been both a leading author and a key team contributor. He has served as first author on numerous papers (demonstrating primary involvement in research design and writing) and as senior author guiding research done under his supervision. His equal presence in first and last author positions, along with a rich network of co-authors, underscores a career marked by team science and mentorship. This collaborative approach has undoubtedly amplified the reach and impact of his work, as evidenced by the range of topics and the sustained output over two decades.
Sources: Publications and data were compiled from PubMed (Medline) search results and author profiles[25][3][18][22], as well as Google Scholar/Scopus insights for citation counts. The analysis reflects PubMed-indexed publications from 2000–2025, providing a comprehensive overview of Carl Haasper’s research contributions over 25 years. Each claim is supported by the references above, ensuring accuracy and traceability to reputable sources.
[1] [3] [4] [5] [6] [7] [10] [13] [16] [17] [24] [25] [26] [27] haasper/ – Search Results – PubMed
https://pubmed.ncbi.nlm.nih.gov/?term=haasper
[2] Prof. Dr. med. Carl Haasper, MSc FEBOT – Orthopädische Chirurgie Bremerhaven-Wesermünde
[8] [Injury severity and pattern at the scene. What is the influence of the …
https://pubmed.ncbi.nlm.nih.gov/20376617
[9] [29] [Prevention of road accidents involving non-motorized traffic participants (pedestrians and cyclists) in Germany] – PubMed
https://pubmed.ncbi.nlm.nih.gov/22159502
[11] [18] [19] [20] Research Impact & Academic Profile – Orthopädische Chirurgie Bremerhaven-Wesermünde
[12] Comment on: Two-stage revision of septic knee prosthesis with …
https://pubmed.ncbi.nlm.nih.gov/23568386
[14] [28] Are Metaphyseal Sleeves a Viable Option to Treat Bone Defect during Revision Total Knee Arthroplasty? A Systematic Review – PubMed
https://pubmed.ncbi.nlm.nih.gov/31879726
[15] [22] [23] The role of hinges in primary total knee replacement – PubMed
https://pubmed.ncbi.nlm.nih.gov/25381417
[21] Total knee arthroplasty using hinge joints: Indications and results in
https://eor.bioscientifica.com/view/journals/eor/4/4/2058-5241.4.180056.xml