Differential diagnosis of spondylolysis in a patient with chronic low back pain

Resident's case problem.

A 26-year-old male sought physical therapy services via direct access secondary to a flare-up of a chronic low back pain condition. The patient complained of recent onset of lumbosacral joint pain, including (1) constant right-sided deep-bruise sensation, (2) intermittent right-sided sharp stabbing pain, and (3) constant bilateral aching. The patient's past medical history included a hyperextension low back injury while playing football at age 17. Physical examination revealed (1) deep pain with palpation over the right lumbosacral joint region, (2) sharp right lumbosacral joint pain with 1 repetition of active trunk backward bending, and (3) a marked increase in pain and joint hypomobility with right unilateral joint assessment at the L4 and L5 spinal levels.

The examining therapist referred the patient for radiographic evaluation due to strong suspicions of a pars interarticularis bony defect. Lumbar plain films, oblique views, revealed an L5 bilateral pars defect, leading to a diagnosis of a longstanding bilateral L5 spondylolysis.

Patients with low back pain often seek physical therapy services. Identification of pathology requiring examination by other health care providers, leading to patient referral to other health care practitioners, is a potential important outcome of the therapist's examination. This resident's case problem illustrates the importance of a systematic examination scheme, including a thorough medical screening component that led to a patient referral for radiographic evaluation. The resultant diagnosis, although not representing serious pathology, did impact the therapist's patient plan of care.