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Original articles  SPORT INJURIES AND REHABILITATION 

The Journal of Sports Medicine and Physical Fitness 2003 March;43(1):69-74

Copyright © 2009 EDIZIONI MINERVA MEDICA

language: English

Dynamics of muscle strength improvement during isokinetic rehabilitation of athletes with ACL rupture and chondromalacia patellae

Desnica Bakrac N.

Cybex Rehabilitation Center, Zagreb, Croatia



Aim. To ­assess quan­ti­ta­tively ­dynamics and ­extent of the ­increase in ­muscle ­strength ­during iso­ki­netic reha­bil­i­ta­tion.
­Methods. Experi­mental ­design: ­daily meas­ure­ments of ­muscle ­strength; ­detailed ­testing at the begin­ning and at the end of reha­bil­i­ta­tion. Set­ting: ­Cybex Reha­bil­i­ta­tion ­Center, ­Zagreb. Sub­jects: 44 ath­letes (31 m, 13 F, age 16-35), 3 ­injury-­defined ­groups: ath­letes ­with ACL rup­ture (non-recon­structed and recon­structed) and chon­drom­a­lacia ­patellae. Inter­ven­tions: all sub­jects under­went iso­ki­netic reha­bil­i­ta­tion on ­Cybex Ortho­tron KT2 ­device, ­using indi­vid­u­ally ­designed pro­to­cols (exten­sion and ­flexion exer­cises, con­cen­tric ­muscle con­trac­tions, 15 treat­ments). Meas­ure­ments: mon­i­toring of ­daily ­progress on reha­bil­i­ta­tion ­device and ­detailed ­testing on diag­nostic ­device.
­Results. All ­patients ­showed con­sid­er­able improve­ment. ­Muscle ­strength ­improved on ­average 141% (SD=110) in ACL-recon­structed ­group, 144% (SD=130) for chon­drom­a­lacia ­patellae ­group and 150% (SD=74) for ACL-non-recon­structed ­group, com­paring to ­initial ­strength. ­Dynamic ­status ­tested on ­Cybex Otrho­tron diag­nostic ­device ­prior and ­after reha­bil­i­ta­tion ­strongly cor­re­lated ­with ­final ­progress mon­i­tored on the reha­bil­i­ta­tion ­device.
Con­clu­sion. Iso­ki­netic reha­bil­i­ta­tion is a ­quick and effec­tive ­method in ­treating ­knee inju­ries in ath­letes. ­Both ­types of objec­tive cri­teria ­have ­shown sig­nif­i­cant ­increase in ­muscle ­strength. The improve­ment of ­muscle ­strength was on the ­average 149% (SD=101), ­which is ­about 10% ­daily for 15 treat­ments. The ­greatest ­progress, 19% per day, ­occurred ­during ­first ­five ­days. The ath­letes ­were ­able to ­resume ­their ­sport activ­ities as fol­lows: ­patients ­from chon­drom­a­lacia ­patellae ­group, and ­most of ­them ­from the non-recon­structed ACL ­group ­were ­back in com­pe­ti­tion ­within a ­month, ­while 75% ­from the ACL recon­structed ­group ­came ­back ­within 3 ­months, and the ­rest of ­them ­within 5 ­months.

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