Change of Lumbar Isometric Extensor Strengths after Posterior Lumbar Interbody Fusion in Patients with Lumbar Degenerative Disease (퇴행성 요추부 질환을 가진 환자의 후방 요추체간 유합술 후 등척성 요부 신전근력의 변화)

Seo Yong Gon (서용곤); LEE， CHONG SUH (이종서); Kyung Chung Kang (강경중); Won Hah Park (박원하)

Change of Lumbar Isometric Extensor Strengths after Posterior Lumbar Interbody Fusion in Patients with Lumbar Degenerative Disease

Journal of Korean Society of Spine Surgery
Abbr : J Kor Spine Sur
2014, 21(4), pp.159-165
Publisher : Korean Society Of Spine Surgery
Research Area : Medicine and Pharmacy > Orthopedic Surgery

Seo Yong Gon ¹, LEE， CHONG SUH ², Kyung Chung Kang ³, Won Hah Park ²

¹삼성서울병원
²성균관대학교
³경희대학교

Accredited

ABSTRACT

Study Design: Prospective cohort study. Objectives: This study was undertaken to examine changes in lumbar isometric extensor strength after posterior lumbar interbodyfusion (PLIF) surgery. Summary of Literature Review: In most reports, the patients that have undergone PLIF surgery have been shown to have muscleweakness and atrophy. However, the research conducted regarding the changes in muscle strength throughout a follow up period isinsufficient. Materials and Methods: Forty-nine patients (mean age, 65 years (range, 45 to 77)), scheduled for posterior lumbar interbody fusion dueto symptomatic degenerative diseases, were enrolled. Preoperatively and 3, 6, and 12 month after surgery, lumbar isometric extensorstrength was assessed using a MedX instrument in 7 angular positions (0-72°). The mean isometric strength and rate of increase werecalculated. Isometric strengths were compared according to patients’ age (<60, 60-70, and ≥70 years) and fusion level (short: <3; andlong: ≥3) and the respective relationships were analyzed. Results: The mean isometric strength changed from 89.0 preoperatively to 85.3, 110.4, and 120.8 ft-lb at each follow-up, respectively. The rate of increase of strength was significantly greater at 0°(36.1 %) than at 72°(24.2 %) (p=0.019). Preoperative isometric strengthswere similar in each age and fusion level group, but isometric strengths at the final follow-up were significantly lower in older patientsand in the long level fusion group (p=0.002 and 0.043, respectively). Mean isometric strength at the last follow-up showed significantassociations with age and fusion level (r=-0.431 and -0.317, p=0.002 and 0.030, respectively). Conclusion: After lumbar fusion surgery, back muscle strength slightly decreased until 3 months and then significantly increased. However, postoperative strength increases were lower in older patients and those in the long level (>3) fusion group. These results couldbe basic data for a rehabilitation program after lumbar fusion.

KEYWORDS

Lumbar degenerative disease, Posterior lumbar interbody fusion, Lumbar isometric extensor strength

Citation status

* References for papers published after 2023 are currently being built.

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