{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,13]],"date-time":"2025-11-13T17:50:59Z","timestamp":1763056259384,"version":"build-2065373602"},"reference-count":64,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2021,11,15]],"date-time":"2021-11-15T00:00:00Z","timestamp":1636934400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCM"],"abstract":"<jats:p>The objective of this study was to assess the effectiveness of, and the correlation between, an average of 42 supervised physiotherapy (SVPh) visits for the vertical ground reaction forces component (vGRF) using ankle hops during two- and one-legged vertical hops (TLH and OLH, respectively), six months after the surgical suturing of the Achilles tendon using the open method (SSATOM) via Keesler\u2019s technique. Hypothesis: Six months of supervised physiotherapy with a higher number of visits (SPHNVs) was positively correlated with higher vGRF values during TLH and OLH. Group I comprised male patients (n = 23) after SSATOM (SVPh x = 42 visits), and Group II comprised males (n = 23) without Achilles tendon injuries. In the study groups, vGRF was measured during TLH and OLH in the landing phase using two force plates. The vGRF was normalized to the body mass. The limb symmetry index (LSI) of vGRF values was calculated. The ranges of motion of the foot and circumferences of the ankle joint and shin were measured. Then, 10 m unassisted walking, the Thompson test, and pain were assessed. A parametric test for dependent and independent samples, ANOVA and Tukey\u2019s test for between-group comparisons, and linear Pearson\u2019s correlation coefficient calculations were performed. Group I revealed significantly lower vGRF values during TLH and OLH for the operated limb and LSI values compared with the right and left legs in Group II (p \u2264 0.001). A larger number of visits correlates with higher vGRF values for the operated limb during TLH (r = 0.503; p = 0.014) and OLH (r = 0.505; p = 0.014). An average of 42 SVPh visits in 6 months was insufficient to obtain similar values of relative vGRF and their LSI during TLH and OLH, but the hypothesis was confirmed that SPHNVs correlate with higher relative vGRF values during TLH and OLH in the landing phase.<\/jats:p>","DOI":"10.3390\/jcm10225299","type":"journal-article","created":{"date-parts":[[2021,11,15]],"date-time":"2021-11-15T08:19:20Z","timestamp":1636964360000},"page":"5299","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Ground Reaction Forces during Vertical Hops Are Correlated with the Number of Supervised Physiotherapy Visits after Achilles Tendon Surgery"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2212-7574","authenticated-orcid":false,"given":"\u0141ukasz","family":"Sikorski","sequence":"first","affiliation":[{"name":"Department of Physiotherapy, College of Physiotherapy in Wroc\u0142aw, 50-038 Wroc\u0142aw, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2713-5090","authenticated-orcid":false,"given":"Andrzej","family":"Czamara","sequence":"additional","affiliation":[{"name":"Department of Physiotherapy, College of Physiotherapy in Wroc\u0142aw, 50-038 Wroc\u0142aw, Poland"},{"name":"Center of Rehabilitation and Medical Education, 50-038 Wroc\u0142aw, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,11,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"193","DOI":"10.1016\/j.foot.2011.08.004","article-title":"Evolution of the Achilles tendon: The athlete\u2019s Achilles heel?","volume":"21","author":"Malvankar","year":"2011","journal-title":"Foot"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"9","DOI":"10.3113\/FAI.2011.0009","article-title":"Achilles Tendon Ruptures in Elite Athletes","volume":"32","author":"Maffulli","year":"2011","journal-title":"Foot Ankle Int."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"72","DOI":"10.1007\/s12178-017-9386-7","article-title":"Achilles tendon injuries","volume":"10","author":"Egger","year":"2017","journal-title":"Curr. 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