From the Field: August 2026
A curated look at what’s worth reading across sports performance, biomechanics, and athlete health — with a few notes from us on why each topic caught our attention.Mahomes is cleared, practicing fully, and probably not playing until Week 1
Multiple outlets, August 2026
Kansas City Chiefs QB Patrick Mahomes tore the ACL and LCL in his left knee on December 14 last season and had surgery the next day. He's been fully cleared to play since early August, taking 11-on-11 reps with the first team in a brace, with head coach Andy Reid saying he's doing everything he normally does. Despite the optimism, however, Mahomes won't appear in the August 15 preseason opener, and may sit all three preseason games — the first missed preseason of his career. The target for his on-field return is Denver on September 14. → Read More
LigaSys take: Reid drew the distinction himself: cleared for practice is not the same as ready for games. Nine months post-op on a repaired ACL and LCL, with a brace on, taking full reps — and the club still won't spend him on August snaps. Worth noting for anyone tempted to interpret "cleared" as "recovered."
Fatigue concentrates at the ankle while the rest of the leg looks fine
Frontiers in Psychology, June 2026
Twelve collegiate gridiron football players completed landing tasks at baseline, after physical fatigue, and after combined physical and cognitive fatigue, the latter induced by cycling to exhaustion while performing a Stroop task. Mixed fatigue produced less ankle dorsiflexion and more inversion at the moment of peak ground reaction force, and a greater peak inversion angle across the landing. Hip and knee kinematics, joint range of motion, inter-joint coordination, peak vGRF, loading rate, and leg stiffness were all unchanged. The authors interpret this as trained athletes compensating well enough to hold global performance steady while the deficit concentrates distally. Small single-site sample, all male, lab conditions. → Read the study
LigaSys take: Every load-monitoring metric in this study stayed flat while the ankle drifted into a worse position. That's an uncomfortable truth. If your fatigue picture comes from force plates and total body kinematics, the athlete in the fourth quarter registers as fine. The authors' own recommendation is to watch joint-level kinematics rather than global indicators, which is easier to say than to do on a sideline.
Ankle braces produce compensation up the kinetic chain
European Journal of Sport Science, July 2026
Twenty badminton players performed forecourt lunges under four bracing conditions while researchers captured kinematics and kinetics. An elastic ankle brace did reduce ankle inversion angle as expected, but produced involuntary compensatory adjustments in the knee varus angle and loading at initial contact. A sleeve-type knee brace increased knee varus angle and varus moments while reducing hip eversion moments. Both supports highlight inter-joint effects in the lower-limb kinetic chain. → Read the study
LigaSys take: A brace doesn't act on one joint in isolation. It changes how the whole limb coordinates, and the study found effects propagating in both directions along the chain. Worth reading closely if you're making bracing decisions over a season, because subconscious compensation and protective reflexes can propagate otherwise invisible injury risk.
Chronic ankle instability shows up as a whole-leg problem
Journal of Orthopaedic Surgery and Research, July, 2026
A meta-analysis of 17 EMG studies covering 757 participants found that people with chronic ankle instability activate the peroneus longus significantly less than healthy controls after initial contact during single-leg landings. Gluteus medius and biceps femoris activation were also reduced, while soleus and rectus femoris activation increased. The authors interpret the pattern as reduced lateral and proximal stabilization paired with a compensatory stiffening strategy. Note that it's currently posted as an unedited early-access manuscript. → Read the meta-analysis
LigaSys take: The peroneals are the body's own defense against inversion, and this quantifies how much that defense degrades once instability sets in. The proximal findings are the part to note for practitioners: the authors argue rehab should extend to hip and landing mechanics rather than stopping at the ankle. Heterogeneity was high for several muscles, so treat the effect sizes with some care.
Sex differences in ankle sprains: real anatomy, missing research
BMC Sports Science, Medicine and Rehabilitation, July, 2026
Researchers at the University of Virginia Center for Applied Biomechanics reviewed 116 articles on how sex affects the mechanism, risk factors, and incidence of lateral ankle sprains in sex-similar sports. Postural sway and instability came through as more prominent risk factors in female athletes; previous sprain history, joint laxity, BMI, and hip strength in males. Relative to all ankle injuries, females sustained significantly more lateral sprains. The paper concludes by saying that although sex differences do encompass differential lateral ligament complex geometries, there is a paucity of research exploring how these differences translate to sprain risk. → Read the review
LigaSys take: Sex does influence the morphology of the lateral ligament complex, and almost nobody has done the work of connecting those anatomical differences to injury thresholds or mechanisms. That's a named, specific gap in a field that isn't short of papers, and it's worth watching over the next few years.
LigaSys is developing Smart Ligament™ systems — reactive wearable hardware designed to sense dangerous joint motion and respond mechanically in real time. If you're working on athlete availability and performance outcomes, we'd like to hear from you.
