Orthogate Subspecialty Journal Scan: Basic Science

Curated critical appraisals of recent high-impact trials and translational evidence in orthopaedic basic science and biomechanics, evaluating gait biomechanics after peroneus longus tendon harvest for anterior cruciate ligament reconstruction, histological and immunohistochemical effects of preoperative subacromial autologous conditioned plasma injections for degenerative supraspinatus tears, and biomechanical fixation properties of suture anchor versus transtibial pull-out techniques for posterior medial meniscus root repairs.

Featured Basic Science Studies This Edition (October 2026)
Level II Basic Science

1. Altered gait biomechanics after peroneus longus tendon harvest for anterior cruciate ligament reconstruction : truth or myth?

Authors: Kotian R, Ajoy S, Panduranga R, Visweswara R, Galagali D et al. | Journal: The bone & joint journal (Jan 2026) | View Source / DOI

Situation

To evaluate the impact of peroneus longus tendon (PLT) harvest on gait biomechanics following anterior cruciate ligament (ACL) reconstruction, addressing scarce long-term literature through computerized spatiotemporal parameter (STP) analysis and functional ambulation profiling over time.

Background

Peroneus longus tendon autograft is an emerging alternative for anterior cruciate ligament reconstruction; however, concerns regarding donor-site ankle morbidity and gait alterations persist, with no prior long-term studies providing objective computerized gait analysis.

Assessment & Findings
  • Study Design & Cohort: This prospective cohort study evaluated 31 patients (23 males and eight females). The mean age was 32.61 years (SD 10.60), with a mean clinical follow-up of 18.34 months (SD 6.25). Mean baseline parameters included height 160.23 cm (SD 8.08), weight 72.39 kg (SD 10.95), and BMI 28.32 kg/m2 (SD 4.74). Computerized gait analysis was performed preoperatively and postoperatively at six months and one year to evaluate spatiotemporal parameters and Functional Ambulation Profile (FAP) scores using repeated measures analysis of variance with Bonferroni post-hoc testing (p < 0.05 considered statistically significant).
  • Biomechanical & Spatiotemporal Outcomes: Cadence, FAP score, single-leg support time, step time, and velocity increased significantly over different time intervals (p < 0.001). Conversely, no significant differences were observed across time intervals for stride length, double support time, stance time, or swing time.
Recommendation & Practice Takeaway

Clinical Pearl: While peroneus longus tendon harvest demonstrates overall functional gait improvement after ACL reconstruction, it causes subtle gait alterations, notably prolonged single-leg support time. Although compensatory mechanisms preserve functional ambulation, these changes warrant careful consideration in athletic cohorts, and integrating targeted postoperative ankle rehabilitation may help reduce potential long-term biomechanical effects.

Level II Basic Science

2. Preoperative subacromial autologous conditioned plasma (ACP) injections and histological and immunohistochemical findings in degenerative supraspinatus tendon tears - results of a prospective comparative cohort study.

Authors: Werner A, Linke C, Krenn V, Linke P | Journal: Journal of shoulder and elbow surgery (Oct 2026) | View Source / DOI

Situation

To evaluate the association of preoperative subacromial autologous conditioned plasma (ACP) injections with histological and immunohistochemical characteristics of degenerative supraspinatus tendons at the time of arthroscopic rotator cuff repair.

Background

Degenerative supraspinatus tendon quality is a key determinant of healing after repair, with advanced histological degeneration linked to increased retear rates. Although platelet-rich plasma is widely utilized intraoperatively, the role of preoperative biological tissue preconditioning remains poorly defined.

Assessment & Findings
  • Study Design & Protocol: In this prospective comparative cohort study of fifty-four patients undergoing arthroscopic repair of isolated, degenerative full-thickness supraspinatus tendon tears, the intervention group (n = 24) received three preoperative subacromial ACP injections (two in one patient) within 3 to 4 weeks before surgery, with the final injection administered no more than 1 week preoperatively. A control group (n = 30) received no preconditioning. Lateral tendon edge biopsies were harvested intraoperatively to evaluate co-primary endpoints (Bonar score and semiquantitative degeneration score) alongside exploratory immunostaining (Ki-67, CD31, CD45/LCA).
  • Histological & Immunohistochemical Outcomes: The ACP group showed lower Bonar scores (6.5 ± 2.0 vs 8.2 ± 1.3, mean difference -1.7, 95% CI -2.7 to -0.7, adjusted P = .044) and lower degeneration scores (1.7 ± 0.8 vs 2.2 ± 0.6, mean difference -0.5, 95% CI -0.9 to -0.1, adjusted P = .044) compared with controls. CD31 immunostaining was higher in the ACP group but not significant after correction for multiple testing (adjusted P = .100). Ki-67, CD45/LCA, reparative changes, and necrotic tissue proportions did not differ between groups.
Recommendation & Practice Takeaway

Clinical Pearl: While preoperative subacromial ACP injections were associated with statistically lower Bonar and degeneration scores in degenerative supraspinatus tendons, the observed differences were small and the Bonar score reduction remained below the predefined minimal clinically important difference, leaving the clinical relevance of preoperative biological preconditioning unconfirmed.

Level II Basic Science

3. Suture Anchor Technique Shows Superior Biomechanical Properties Compared With Transtibial Pull-Out for Posterior Medial Meniscus Root Repairs: A Systematic Review.

Authors: Meng C, Cheng Q, Liu M, Xu J, Hou P et al. | Journal: Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association (Jul 2026) | View Source / DOI

Situation

To compare the biomechanical properties between transtibial pull-out (TP) and suture anchor (SA) techniques for treating posterior medial meniscal root tears (PMMRTs).

Background

Posterior medial meniscal root tears compromise load distribution and accelerate joint degeneration. Selecting an optimal surgical repair technique requires rigorous biomechanical comparison between suture anchor and transtibial pull-out constructs regarding displacement, load to failure, and contact kinematics.

Assessment & Findings
  • Study Selection & Cohort: A systematic search across PubMed, Embase, and Cochrane databases for comparative cadaveric and animal biomechanical studies published before April 20, 2025 identified 7 biomechanical studies comprising 165 porcine knee joints and 44 human cadaver knee joints. Quality assessment was conducted using the Biomechanics Objective Basic science Quality Assessment Tool.
  • Biomechanical Performance: Suture anchor repair was significantly superior to transtibial pull-out for initial load, failure load, contact area, and structural stiffness (P < .05). In clinical failure load testing (defined as 3-mm displacement), the SA group (48.6-74.0 N) was significantly higher than the TP group (19.9-56.7 N) (P < .001). Under cyclic loading, 5 studies showed significantly smaller displacement in the SA group (P < .01), whereas 3 studies found no significant differences in initial and failure displacements. Contact pressure was comparable in 2 out of 3 studies, but contact area was larger in the SA group in 2 studies (P < .05).
  • Failure Modes: Suture cutout from the meniscus was the most common known failure mode for both techniques: 56% in the TP group and 52% in the SA group. In the TP group, remaining known failures were suture-related (44%, including elongation and breakage). In the SA group, additional known failure modes included suture elongation (19%) and suture eyelet breakage (7%), with 22% of failures uncategorized in original studies.
Recommendation & Practice Takeaway

Clinical Pearl: Compared with transtibial pull-out, suture anchor repair for posterior medial meniscal root tears provides superior cyclic displacement resistance, higher initial and ultimate failure loads, greater stiffness, and larger tibiofemoral contact area. However, because suture cutout through the meniscus represents the most frequent failure mechanism in both techniques, surgeons must optimize stitch geometry and suture-meniscus interface security regardless of fixation construct.

Orthogate Weekly Journal Scan is curated and synthesized by ORION (Orthopaedic Research, Intelligence & Operations Navigator) for orthopaedic surgeons, fellows, and residents. Evidence synthesized under the clinical direction of Christian Veillette, MD, MSc, FRCSC.