Table 8. Synthesis of the main findings for Pattelar tendon.
Study Pain Outcomes Function Outcomes Performance / RTS Tendon Structure / Physiology Safety / Adherence
(Abat et al., 2016) Pain not separated from VISA-P. VISA-P ↑ in both arms. USGET+ECC higher success (72.4% vs 36.1%, χ2=10.3, p=0.001). Subgroup Δ (VISA-P<90): MD +10.1 (95% CI 6.3–13.8, p<0.001). Subgroup Δ (≥90): MD +29.2 (95% CI 13.4–24.7, p<0.001). RTS not directly assessed. “Healed” defined as VISA-P ≥90; 50% healed at 28–56 d with USGET (2–4 sessions). At 42 d: 58.7% healed (USGET) vs 12.5% (Electro-physio), p<0.01. Not assessed. No AEs; withdrawals NR.
(Bahr et al., 2006) VAS0–10 during tests ↓ in both at 12m (all p<0.01); no between-group diff. VISA-P ≈30→70 by 12m in both; no between-group diff (ANOVA p=0.87). No jump/leg-press between-group diff; both ↑ strength to 12m. RTS distributions similar at 12m. Not assessed. One post-op quad pain; 25% ECC knees crossed to surgery.
(Biernat et al., 2014) Pain reflected by VISA-P. VISA-P ↑ with ECC (85→90 at 24w, p<0.05 vs control). Control ~NS. Jump height / power: NS. RTS NR. US: trend to fewer morph changes / neovasc in ECC. No AEs; no dropouts.
(Breda et al., 2021) Pain during tendon-specific exercise at 24w: PTLE 2 vs EET 4; diff=2 (95% CI 1–3), p=0.006. VISA-P: BL 55 both. 24w: PTLE 84 vs EET 75 (p=0.023). MCID (≥13): 87% vs 77% (NS). RTS: 24w 43% (PTLE) vs 27% (EET) (NS). Imaging collected; results in supplement. Satisfaction “excellent” higher with PTLE (38% vs 10%, p=0.009). No serious AEs.
(Cannell et al., 2001) VAS0–10 ↓ both arms over 12w (p<0.01); NS between groups. No VISA used. RTS: 90% (drop squat) vs 67% (leg ext/curl) at 12w (NS). Strength: quads NS; hamstrings ↑ both (p<0.001). Not assessed. All completed ≥55/60 sessions; no AEs.
(Cunha et al., 2012) VAS0–10: ECC-with-pain and ECC-pain-free both ↓ at 8w/12w (p<0.05); NS between groups. VISA-P ↑ both (p<0.05); NS between groups. RTS NR. Not assessed. 17→14 completed.
(Frohm et al., 2007) VAS0–10: Device 4→0 (p=0.003); Decline 5→1 (p=0.008); NS between groups. VISA-P: Device 49→86; Decline 36→75 (both p<0.001). One-leg triple hop ↑ both (p<0.001). RTS: majority resumed. Not reported. No AEs; full adherence.
(Jonsson and Alfredson, 2005) VAS0–100: ECC 73→23 (p<0.005); CONC 74→68 (NS). VISA-P: ECC 41→83 (p<0.005); CONC 41→37 (NS). RTS: 9/10 tendons (ECC) satisfied & returned by 12w; 0/9 (CONC); all CONC later needed surgery/sclerosing. ~32m FU: ECC VAS ~18; VISA-P ~88.5. Not assessed. CONC had dropouts due to pain; ECC tolerated.
(Kongsgaard et al., 2009) VAS0–10: all ↓ at 12w; at 6m, CORT deteriorated; ECC maintained; HSR best (lower pain vs CORT, p<0.05) VISA-P: all ↑ at 12w; at 6m, CORT regressed; ECC stable; HSR highest (HSR > CORT; ECC > CORT, p<0.05) Satisfaction at 6m highest in HSR (73%) Thickness ↓ in CORT & HSR; Doppler ↓ CORT & HSR; collagen turnover ↑ only in HSR (↑HP/LP, ↓pentosidine). Mechanics unchanged. No AEs; adherence high.
(Niering and Muehlbauer, 2023) Pain-related training interruptions: ALT fewer (0.1±0.3 vs 1.3±1.3; p=0.002, d=1.16). Physical performance improved in both; CODS improved more in ALT (left-leg interaction p=0.007). ALT shorter program (47±16 d vs 58±25 d). Structure not assessed. Injury incidence lower in ALT (p=0.023, d=0.82). Attendance ALT 96% vs CON 89%.
(Ruffino et al., 2021) Provocative VAS0–10 ~7→~3 at 12w both; NS between groups. VISA-P: ↑ both; NS between groups at 6/12w. PSFS ↑ both; EQ-5D / EQ-VAS ↑ both. CMJ, hop, strength tests improved similarly; RTS NR. Patellar AP diameter unchanged; neovasc distributions converged by 12w; NS between groups. Adherence high (88–90%); no AEs.
(Sánchez-Gómez et al., 2022) VISA-P: NS over time (p=0.202). — (same as pain). CMJ ↑ (35.3→39.5 cm, p=0.031). Back squat: PPKG ↑ (55.0→73.6 kg, p=0.033); PP ↑ POST vs PRE (p=0.037, overall trend p=0.060); PPMV NS. 5-RM ↑ (60.4→75.4 kg, p=0.001). US: thickness ↓ injured (7.74→5.69 mm, p=0.045); side-to-side diff resolved by POST. ~5.6 sessions/wk; no AEs.
(Gómez et al., 2023) VISA-P / pain: NS for intervention, supplement, or interaction. CMJ: significant intervention×supplement (HMB ↑ ~+3 cm, p=0.049). Back squat: PPKG ↑ overall (p=0.028). PPPP ↑ only in HMB (p=0.049). 5-RM ↑ both groups (p=0.001). PPMV NS. Body comp: NS. No AEs; small n=8; full adherence.
(van Ark et al., 2016) NRS0–10 during SLDS: Isometric 6.3→4.0 (p=0.012); Isotonic 5.5→2.0 (p=0.003); NS between groups. VISA-P: Isometric 66.5→75.0 (p=0.028); Isotonic 69.5→79.0 (p=0.003); NS between groups. Athletes maintained full in-season loads; GRC +2.3 (improved). Not assessed. Median 3 sessions/wk (~81%); no AEs.
(Visnes et al., 2005) VISA-P: no change ECC (71.1→70.2, NS) or control (76.4→75.4, NS); transient week-1 pain dip only. Global knee function: NS between groups. Jump tests: small within-group CMJ both-legs +1.2 cm (p=0.046); other tests NS; no RTS advantage. Not assessed. ECC compliance ~59% of prescription; low external load; one new PFP case; otherwise safe.
(Young et al., 2005) VAS0–100: both improved at 12w & 12m (both p<0.05). At 12w step more likely ↓ pain; at 12m groups similar. VISA-P: both improved at 12w & 12m (both p<0.05). 12m: decline squat had higher likelihood of ≥20-pt gain (94% vs 41%). Athletes trained/competed; decline showed more durable functional benefit at 12m. Not assessed. Compliance ~72%; no AEs.
ADL: activities of daily living; AE: adverse event; AG: Alfredson group; ALT: alternative therapy; AP: anteroposterior; ACSA: anatomical cross-sectional area; AT: Achilles tendinopathy; BL: baseline; CA: color area (Doppler neovascularity); CMJ: countermovement jump; CODS: change-of-direction speed; CON: conventional therapy; CONC: concentric exercise; CORT: corticosteroid injection; CSA: cross-sectional area; DJ: drop jump; Doppler: power/color Doppler ultrasound; ECC: eccentric exercise; EET: eccentric exercise therapy; EOT: end of treatment; ESWT: extracorporeal shock-wave therapy; FAOS: Foot and Ankle Outcome Score; FU: follow-up; GPE: global perceived effect; GRC: global rating of change; HMB: β-hydroxy β-methylbutyrate; HPLT: high-power laser therapy; HP/LP: hydroxylysyl-/lysyl-pyridinoline ratio; HSR: heavy slow resistance; ICTP: carboxy-terminal telopeptide of type-I collagen; IP: intrapatient; IPT: isokinetic peak torque; IQR: interquartile range; KOOS: Knee injury and Osteoarthritis Outcome Score; LLLT: low-level laser therapy; MD: mean difference; m/M: months; MVC: maximal voluntary contraction; MVIC: maximal voluntary isometric contraction; N/A or NR: not assessed / not reported; NRS or NPRS: numeric (pain) rating scale (0–10); NS: not significant; P-CSA: patellar tendon cross-sectional area; PFP: patellofemoral pain; PICP: procollagen type-I C-terminal propeptide; PP: peak power; PPKG: load at peak power (kg); PPMV: mean velocity at peak power; PPPP: peak power in watts; PT: patellar tendinopathy; PTLE: progressive tendon-loading exercise; PHT: proximal hamstring tendinopathy; QoL: quality of life; rHb: postcapillary venous filling pressure (relative hemoglobin); RTS: return to sport; SG: Silbernagel group; SLDS: single-leg decline squat; StO2: tissue oxygen saturation; SWT: shock-wave treatment; US: ultrasound; USGET: ultrasound-guided electrolysis therapy (as named in Abat 2016); VAS0–10: visual analogue scale 0–10; VAS0–100: visual analogue scale 0–100 mm; VISA-A: Victorian Institute of Sport Assessment—Achilles; VISA-P: Victorian Institute of Sport Assessment—Patella; wk/w: week(s). Symbols — ↑: increase; ↓: decrease; →: to; ≈: approximately.